Add Linux sdk items and fix toolchain downloader to really respect HostOS #2
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…stOS. - fix Android SDK Tools location. - add SDK/NDK items for Linux. - xbuild condition did not work and downloaded all the items. It was because condition by metadata didn't work with the complicated expression. So, split filtering and transformation into different tasks. - xbuild aborts when the specified metadata %(HostOS) does not exist, so specify dummy HostOS metadata (which is ugly but not too annoying). (Linux build verification is still ongoing, not assuring that this fixes all the possible existing issues.)
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Apart from the changes, I believe you should not use plural form for build actions (build item names). |
: error : Error building target _UnzipFiles: Item metadata should be referenced with the item name %(ItemName.MetadataName)
| <HostOS>Darwin</HostOS> | ||
| </AndroidSdkItem> | ||
| <AndroidSdkItem Include="platform-N_r01.zip"> | ||
| <HostOS></HostOS> |
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radical
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May 8, 2018
Context: dotnet/java-interop#2 Context: dotnet/java-interop#8 From Issue #8: > I don't like JniMarshalInfo; it's too convoluted, makes the > simple cases hard. What do we mean by "hard"? We mean that it's use is error prone, because what you need to do depends on the values of the JniMarshalInfo members, which is best characterized by what JniArgumentMarshalInfo had to do to create a JNI Local refererence: JniObjectReference lref; var marshaler = JniRuntime.CurrentRuntime.ValueManager.GetJniMarshalInfoForType (type); if (info.CreateMarshalCollection != null) { var obj = info.CreateMarshalCollection (value); lref = obj.PeerReference; } else if (info.CreateLocalRef != null) { lref = info.CreateLocalRef (value); } else throw new NotSupportedException ("Don't know how to get a JNI Local Reference!"); // can now use `lref`... Need to pass as a method argument? Similar-yet-different. Then there's the cleanup code! The eventual intention is for tools/jnimarshalmethod-gen to post-process assemblies and generate Java > Managed marshal methods for all resolvable methods, and do this "dynamically" based on the actual types involved. This will allow "fixing" binding assemblies when involved types change, because binding assemblies won't be as "static" as they are in Xamarin.Android. (Which is why Issue #8 mentions using Expressions for the marshaling.) However, before we can get there we first need a rational marshaling abstrasction, something that is "pluggable" and readily extensible, so taht we can e.g. have a custom attribute to control which marshaler to use on types, parameters, and method return types. JniMarshalInfo wasn't that abstraction, and couldn't *be* that abstraction. To replace JniMarshalInfo, introduce JniValueMarshaler and JniValueMarshler<T>: public abstract partial class JniValueMarshaler { public abstract object CreateValue (ref JniObjectReference reference, JniObjectReferenceOptions options, Type targetType = null); public virtual JniValueMarshalerState CreateArgumentState (object value, ParameterAttributes synchronize = 0); public abstract JniValueMarshalerState CreateObjectReferenceArgumentState (object value, ParameterAttributes synchronize = 0); public abstract void DestroyArgumentState (object value, ref JniValueMarshalerState state, ParameterAttributes synchronize = 0); } public abstract partial class JniValueMarshaler<T> : JniValueMarshaler { public abstract T CreateGenericValue (ref JniObjectReference reference, JniObjectReferenceOptions options, Type targetType = null); public virtual JniValueMarshalerState CreateGenericArgumentState (T value, ParameterAttributes synchronize = 0); public abstract JniValueMarshalerState CreateGenericObjectReferenceArgumentState (T value, ParameterAttributes synchronize = 0); public abstract void DestroyGenericArgumentState (T value, ref JniValueMarshalerState state, ParameterAttributes synchronize = 0); public override object CreateValue (ref JniObjectReference reference, JniObjectReferenceOptions options, Type targetType = null); public override JniValueMarshalerState CreateArgumentState (object value, ParameterAttributes synchronize = 0); public override JniValueMarshalerState CreateObjectReferenceArgumentState (object value, ParameterAttributes synchronize = 0); public override void DestroyArgumentState (object value, ref JniValueMarshalerState state, ParameterAttributes synchronize = 0); } The intention is that a custom marshaler can be introduced by inheriting from JniValueMarshaler<T> and overriding three methods. This also provides a reasonable abstraction, e.g. to create a JNI Local Reference: var state = marshaler.CreateGenericObjectReferenceArgumentState (value); // state.ReferenceValue contains a JNI Object Reference // use, then cleanup: marshaler.DestroyGenericArgumentState (value, ref state); The methods are as follows: * CreateValue, CreateGenericValue: Java > Managed marshaler. Given a JniObjectReference, marshal the value to a type compatible with specified targetType, which should be either null or a class assignment compatible to T. The other methods use a JniValueMarshalerState type: public partial struct JniValueMarshalerState { public JniArgumentValue JniArgumentValue {get;} public JniObjectReference ReferenceValue {get;} public IJavaPeerable PeerableValue {get;} } The remaining methods of import are: * CreateArgumentState(), CreateGenericArgumentState(): Managed > Java marshaler. Used when the intention is to use JniValueMarshalerState.JniArgumentValue, which in turn is for use with JniEnvironment.*Methods.Call*Method(). * CreateObjectReferenceArgumentState(), CreateGenericObjectReferenceArgumentState(): Managed > Java marshaler. Used when the intention is to use JniValueMarshalerState.ReferenceValue. * DestroyArgumentState(), DestroyGenericArgumentState(): Generic resource cleanup mechanism for use with Create*ArgumentState(). The primary difference between Create*ArgumentState() and Create*ObjectReferenceArgumentState() is with builtin value types, e.g. `int`. Create*ArgumentState() will *only* provide a JniArgumentValue, while JniValueMarshalerState.ReferenceValue will be null. Create*ObjectReferenceArgumentState(), meanwhile, will "box" the value type, providing a valid JniValueMarshalerState.ReferenceValue. For all other types, these methods are identical. JniValueMarshaler and JniValueMarshalerState together combine to replace JniMarshalInfo and JniArgumentMarshalInfo, the latter of which (1) wasn't public, and (2) was "duplicated" between the generic marshalers and Java.Interop.Dynamic. JniValueMarshaler thus allows cleaning up this duplication. Along with the new JniValueMarshaler abstraction, we provide implementations for all builtin types, Nullable<T> for builtin types (which always box), arrays of the builtin types, JavaObjectArray<T>, IJavaPeerable, and `object`. The `object` marshaler supersedes the previous JniMarshal.GetValue<T>() semantics, using JavaProxyObject as needed. One thing to note is the ParameterAttributes parameters. This value is intended to correspond with System.Reflection.ParameterInfo.Attributes. jnimarshalmethod-gen can thus use the actual MethodInfo + ParameterInfo to encode parameter marshaling direction. For most types this won't be useful; this is largely intended for *arrays*, e.g. we could have an `[In] int[]` parameter which thus avoids the "copy out" behavior Xamarin.Android currently performs, thus avoiding an extra JNI transition. Or vice-versa, have an `[Out] int[]` parameter, which avoids a JNI transition to copy the managed `int[]` to the Java `int[]`, replacing it with the copy-out transition. Partially addressing Issue #2, this also introduces JniRuntime.JniValueManager.GetValue() and GetValue<T>() methods. GetObject() is not yet replaced, but will be in a future commit. Actual implementation will be done alongside introduction of CreateValue<T>() and cleaning up JniValueMarshaler.Create*Value() methods to always create values when able, simplifying the logic if JniValueMarshaler implementations.
radical
pushed a commit
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May 8, 2018
When `JniRuntime.CreationOptions.DestroyRuntimeOnDispose` is true,
`JavaVM::DestroyJavaVM()` will be invoked when the `JniRuntime`
instance is disposed *or* finalized.
`JreRuntime.CreateJreVM()` would *always* set
`DestroyRuntimeOnDispose` to true, because it called
`JNI_CreateJavaVM()`, so *of course* you'd want to destroy the
Java VM, right?
Which brings us to unit tests. I don't know of any "before all test
fixtures run" and "after all test fixtures run" extension points,
which means:
1. The JVM needs to be created implicitly, "on demand."
2. There's no good way to destroy the JVM created in (1) after all
tests have finished executing.
Which *really* means that the `JreRuntime` instance is *finalized*,
which sets us up for the unholy trifecta of AppDomain unloads,
finalizers, and JVM shutdown:
For unknown reasons, ~randomly, when running the unit tests (e.g.
`make run-tests`), the test runner will *hang*, indefinitely.
Attaching `lldb` and triggering a backtrace shows the unholy trifecta:
Finalization:
thread #4: tid = 0x403831, 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'tid_1403'
...
frame #10: 0x00000001001ccb4a mono64`mono_gc_run_finalize(obj=<unavailable>, data=<unavailable>) + 938 at gc.c:256 [opt]
frame #11: 0x00000001001cdd4a mono64`finalizer_thread [inlined] finalize_domain_objects + 51 at gc.c:681 [opt]
frame #12: 0x00000001001cdd17 mono64`finalizer_thread(unused=<unavailable>) + 295 at gc.c:730 [opt]
JVM destruction:
thread #4: tid = 0x403831, 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'tid_1403'
frame #0: 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fffa04d4728 libsystem_pthread.dylib`_pthread_cond_wait + 767
frame #2: 0x000000010ba5bc76 libjvm.dylib`os::PlatformEvent::park() + 192
frame #3: 0x000000010ba38e32 libjvm.dylib`ParkCommon(ParkEvent*, long) + 42
frame #4: 0x000000010ba39708 libjvm.dylib`Monitor::IWait(Thread*, long) + 168
frame #5: 0x000000010ba398f0 libjvm.dylib`Monitor::wait(bool, long, bool) + 246
frame #6: 0x000000010bb3dca2 libjvm.dylib`Threads::destroy_vm() + 80
frame #7: 0x000000010b8fd665 libjvm.dylib`jni_DestroyJavaVM + 254
AppDomain unload:
thread #37: tid = 0x4038fb, 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #0: 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fffa04d4728 libsystem_pthread.dylib`_pthread_cond_wait + 767
frame #2: 0x0000000100234a7f mono64`mono_os_cond_timedwait [inlined] mono_os_cond_wait(cond=0x0000000102016e50, mutex=0x0000000102016e10) + 11 at mono-os-mutex.h:105 [opt]
frame #3: 0x0000000100234a74 mono64`mono_os_cond_timedwait(cond=0x0000000102016e50, mutex=0x0000000102016e10, timeout_ms=<unavailable>) + 164 at mono-os-mutex.h:120 [opt]
frame #4: 0x0000000100234828 mono64`_wapi_handle_timedwait_signal_handle(handle=0x0000000000000440, timeout=4294967295, alertable=1, poll=<unavailable>, alerted=0x0000700000a286f4) + 536 at handles.c:1554 [opt]
frame #5: 0x0000000100246370 mono64`wapi_WaitForSingleObjectEx(handle=<unavailable>, timeout=<unavailable>, alertable=<unavailable>) + 592 at wait.c:189 [opt]
frame #6: 0x00000001001c832e mono64`mono_domain_try_unload [inlined] guarded_wait(timeout=4294967295, alertable=1) + 30 at appdomain.c:2390 [opt]
frame #7: 0x00000001001c8310 mono64`mono_domain_try_unload(domain=0x000000010127ccb0, exc=0x0000700000a287a0) + 416 at appdomain.c:2482 [opt]
frame #8: 0x00000001001c7db2 mono64`ves_icall_System_AppDomain_InternalUnload [inlined] mono_domain_unload(domain=<unavailable>) + 20 at appdomain.c:2379 [opt]
frame #9: 0x00000001001c7d9e mono64`ves_icall_System_AppDomain_InternalUnload(domain_id=<unavailable>) + 46 at appdomain.c:2039 [opt]
This randomly results in deadlock, and hung Jenkins bots.
Fix this behavior by altering `JreRuntime.CreateJreVM()` to *not*
override the value of
`JniRuntime.CreationOptions.DestroyRuntimeOnDispose`. This allows the
constructor of the `JreRuntime` instance to decide whether or not the
JVM is destroyed.
In the case of TestJVM, we *don't* want to destroy the JVM.
This prevents the JVM from being destroyed, which in turn prevents the
hang during process shutdown.
grendello
referenced
this pull request
in grendello/xamarin-android
Jul 18, 2018
Xamarin.Android uses the ILRepack task (https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task/) to repack/merge the `Xamarin.Android.Build.Tasks` assembly, a step that is performed after the `Xamarin.Android.Build.Tasks` project build completes. The step takes the project's output assembly and several other dependencies and merges them into one, replacing the original output assembly. For the majority of time it works flawlessly, however the scenario described below causes a Mono runtime crash (similar to this one mono/mono#9613, although not identical). The crash causes aren't yet know in every detail, but the high level overview of the issue is as follows. Mono runtime uses the `mmap(2)` system call on Unix to map the on-disk image of the assembly into memory. The mmapped area is used whenever the same assembly is loaded (e.g. via `Assembly.LoadFrom`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction - when an external process (or even the same Mono process) writes to the file that was mmapped. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard - the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored, on Linux, however, the write leads either to the SIGBUS signal being sent to the process or corruption to the mmapped memory area (details of how this happens are, as of yet, unknown - it's just a theory at this point). The problem occurs in our case when the `ILRepacker` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually leading to a segfault: #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 dotnet#4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 dotnet#5 <signal handler called> dotnet#6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 dotnet#7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 dotnet#8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 dotnet#9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 dotnet#10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 dotnet#11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 dotnet#12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 dotnet#13 0x00000000412f4007 in ?? () dotnet#14 0x00007f97440e1918 in ?? () dotnet#15 0x00007f9749bd1800 in ?? () dotnet#16 0x00000000e36e75af in ?? () dotnet#17 0x00007f974434fda8 in ?? () dotnet#18 0x00007f9749bd18e0 in ?? () dotnet#19 0x00007f96e0002820 in ?? () dotnet#20 0x00007f9712164160 in ?? () dotnet#21 0x00007f9712164010 in ?? () dotnet#22 0x0000000000000000 in ?? () The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks` assembbly's mmaped area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The situation can be detected by the runtime by using advisory locks and reporting the attempt to overwrite the mmapped area, however a fix would require creating a copy of all the assembly's in-memory data before the write is allowed and that might be too expensive. None of those measures are currently implemented by Mono (and it isn't sure if any of them will ever be implemented). The crash this commit fixes occurs in a very specific scenario - when building the `OpenTK.csproj` project *directly* (that is passing it as parameter to `msbuild`), which causes a the `Xamarin.Android.Build.Tasks` assembly to be loaded for use in the `<UsingTask/>` msbuild statement, but at the same time `OpenTK.csproj` references the `Xamarin.Android.Build.Tasks` *project* which causes the ILRepacker task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the ILRepacker target not run every time but only whenver the assembly has to be re-packed because it has just been rebuilt.
grendello
referenced
this pull request
in grendello/xamarin-android
Jul 19, 2018
Xamarin.Android uses the ILRepack task (https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task/) to repack/merge the `Xamarin.Android.Build.Tasks` assembly, a step that is performed after the `Xamarin.Android.Build.Tasks` project build completes. The step takes the project's output assembly and several other dependencies and merges them into one, replacing the original output assembly. For the majority of time it works flawlessly, however the scenario described below causes a Mono runtime crash (similar to this one mono/mono#9613, although not identical). The crash causes aren't yet know in every detail, but the high level overview of the issue is as follows. Mono runtime uses the `mmap(2)` system call on Unix to map the on-disk image of the assembly into memory. The mmapped area is used whenever the same assembly is loaded (e.g. via `Assembly.LoadFrom`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction - when an external process (or even the same Mono process) writes to the file that was mmapped. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard - the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored, on Linux, however, the write leads either to the SIGBUS signal being sent to the process or corruption to the mmapped memory area (details of how this happens are, as of yet, unknown - it's just a theory at this point). The problem occurs in our case when the `ILRepacker` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually leading to a segfault: #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 dotnet#4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 dotnet#5 <signal handler called> dotnet#6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 dotnet#7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 dotnet#8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 dotnet#9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 dotnet#10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 dotnet#11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 dotnet#12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 dotnet#13 0x00000000412f4007 in ?? () dotnet#14 0x00007f97440e1918 in ?? () dotnet#15 0x00007f9749bd1800 in ?? () dotnet#16 0x00000000e36e75af in ?? () dotnet#17 0x00007f974434fda8 in ?? () dotnet#18 0x00007f9749bd18e0 in ?? () dotnet#19 0x00007f96e0002820 in ?? () dotnet#20 0x00007f9712164160 in ?? () dotnet#21 0x00007f9712164010 in ?? () dotnet#22 0x0000000000000000 in ?? () The accompanying managed stacktrace looks as follows: Stacktrace: at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Reflection.Assembly.LoadFrom (string,bool) [0x0001b] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Reflection.Assembly.LoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:539 at System.Reflection.Assembly.UnsafeLoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:571 at Microsoft.Build.Shared.TypeLoader.LoadAssembly (Microsoft.Build.Shared.AssemblyLoadInfo) [0x0001e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes.ScanAssemblyForPublicTypes () [0x00007] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes/<>c__DisplayClass8_0.<GetLoadedTypeByTypeName>b__0 (string) [0x000b4] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Collections.Concurrent.ConcurrentDictionary`2<TKey_REF, TValue_REF>.GetOrAdd (TKey_REF,System.Func`2<TKey_REF, TValue_REF>) [0x00034] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes.GetLoadedTypeByTypeName (string) [0x0003c] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader.GetLoadedType (System.Collections.Concurrent.ConcurrentDictionary`2<System.Func`3<System.Type, object, bool>, System.Collections.Concurrent.ConcurrentDictionary`2<Microsoft.Build.Shared.AssemblyLoadInfo, Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes>>,string,Microsoft.Build.Shared.AssemblyLoadInfo) [0x00042] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader.Load (string,Microsoft.Build.Shared.AssemblyLoadInfo) [0x00008] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.AssemblyTaskFactory.InitializeFactory (Microsoft.Build.Shared.AssemblyLoadInfo,string,System.Collections.Generic.IDictionary`2<string, Microsoft.Build.Framework.TaskPropertyInfo>,string,System.Collections.Generic.IDictionary`2<string, string>,bool,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation,string) [0x00058] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry/RegisteredTaskRecord.GetTaskFactory (Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation,string) [0x000b8] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry/RegisteredTaskRecord.CanTaskBeCreatedByFactory (string,string,System.Collections.Generic.IDictionary`2<string, string>,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation) [0x0003b] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry.GetMatchingRegistration (string,System.Collections.Generic.List`1<Microsoft.Build.Execution.TaskRegistry/RegisteredTaskRecord>,string,System.Collections.Generic.IDictionary`2<string, string>,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation) [0x0001a] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry.GetTaskRegistrationRecord (string,string,System.Collections.Generic.IDictionary`2<string, string>,bool,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation,bool&) [0x00169] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry.GetRegisteredTask (string,string,System.Collections.Generic.IDictionary`2<string, string>,bool,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation) [0x00010] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskExecutionHost.FindTaskInRegistry (System.Collections.Generic.IDictionary`2<string, string>) [0x00038] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.FindTask (System.Collections.Generic.IDictionary`2<string, string>) [0x0000b] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19.MoveNext () [0x0011e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19> (Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TaskBuilder.ExecuteBucket (Microsoft.Build.BackEnd.TaskHost,Microsoft.Build.BackEnd.ItemBucket,Microsoft.Build.BackEnd.TaskExecutionMode,System.Collections.Generic.Dictionary`2<string, string>) [0x00048] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18.MoveNext () [0x0016a] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18> (Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TaskBuilder.ExecuteTask (Microsoft.Build.BackEnd.TaskExecutionMode,Microsoft.Build.BackEnd.Lookup) [0x00037] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13.MoveNext () [0x00193] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13> (Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TaskBuilder.ExecuteTask (Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.BackEnd.BuildRequestEntry,Microsoft.Build.BackEnd.ITargetBuilderCallback,Microsoft.Build.Execution.ProjectTargetInstanceChild,Microsoft.Build.BackEnd.TaskExecutionMode,Microsoft.Build.BackEnd.Lookup,Microsoft.Build.BackEnd.Lookup,System.Threading.CancellationToken) [0x0006c] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52.MoveNext () [0x00091] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52> (Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TargetEntry.ProcessBucket (Microsoft.Build.BackEnd.ITaskBuilder,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.BackEnd.TaskExecutionMode,Microsoft.Build.BackEnd.Lookup,Microsoft.Build.BackEnd.Lookup) [0x00051] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45.MoveNext () [0x002bb] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45> (Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316 at Microsoft.Build.BackEnd.TargetEntry.ExecuteTarget (Microsoft.Build.BackEnd.ITaskBuilder,Microsoft.Build.BackEnd.BuildRequestEntry,Microsoft.Build.BackEnd.Logging.ProjectLoggingContext,System.Threading.CancellationToken) [0x00048] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TargetBuilder/<ProcessTargetStack>d__21.MoveNext () [0x003a5] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<System.Threading.Tasks.VoidTaskResult>.TrySetResult (System.Threading.Tasks.VoidTaskResult) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<System.Threading.Tasks.VoidTaskResult>.SetResult (System.Threading.Tasks.VoidTaskResult) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<System.Threading.Tasks.VoidTaskResult>.SetResult (System.Threading.Tasks.Task`1<System.Threading.Tasks.VoidTaskResult>) [0x00010] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:636 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.SetResult () [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:378 at Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45.MoveNext () [0x00720] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52.MoveNext () [0x001d5] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13.MoveNext () [0x0021e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18.MoveNext () [0x002be] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19.MoveNext () [0x003e5] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<InitializeAndExecuteTask>d__24.MoveNext () [0x0012d] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteInstantiatedTask>d__26.MoveNext () [0x0065e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<bool>.TrySetResult (bool) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<bool>.SetResult (bool) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.MSBuild/<ExecuteInternal>d__76.MoveNext () [0x004dd] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<bool>.TrySetResult (bool) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<bool>.SetResult (bool) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.MSBuild/<BuildProjectsInParallel>d__77.MoveNext () [0x0014a] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<bool>.TrySetResult (bool) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<bool>.SetResult (bool) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.MSBuild/<ExecuteTargets>d__80.MoveNext () [0x00713] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<Microsoft.Build.Framework.BuildEngineResult>.TrySetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.Framework.BuildEngineResult>.SetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.TaskHost/<InternalBuildProjects>d__49.MoveNext () [0x0025c] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<Microsoft.Build.Framework.BuildEngineResult>.TrySetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.Framework.BuildEngineResult>.SetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.TaskHost/<BuildProjectFilesInParallelAsync>d__53.MoveNext () [0x004fb] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.RequestBuilder/<BuildProjects>d__33.MoveNext () [0x00263] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.RequestBuilder/<StartNewBuildRequests>d__51.MoveNext () [0x0020e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<int>.TrySetResult (int) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Threading.Tasks.TaskCompletionSource`1<int>.TrySetResult (int) [0x00000] in /home/grendel/vc/mono/mono/external/corefx/src/Common/src/CoreLib/System/Threading/Tasks/TaskCompletionSource.cs:274 at Microsoft.Build.Shared.AwaitExtensions/<>c__DisplayClass7_2.<ToTask>b__0 (object,bool) [0x00038] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Threading.RegisteredWaitHandle.DoCallBack (object) [0x00008] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Threading/RegisteredWaitHandle.cs:103 at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context (object) [0x0000d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:1308 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () [0x00021] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:1285 at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00074] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:858 at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:1213 at (wrapper runtime-invoke) <Module>.runtime_invoke_bool (object,intptr,intptr,intptr) [0x0001f] in <79002cfb0e6e431d8465d6dcea08995e>:0 The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks` assembbly's mmaped area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The situation can be detected by the runtime by using advisory locks and reporting the attempt to overwrite the mmapped area, however a fix would require creating a copy of all the assembly's in-memory data before the write is allowed and that might be too expensive. None of those measures are currently implemented by Mono (and it isn't sure if any of them will ever be implemented). The crash this commit fixes occurs in a very specific scenario - when building the `OpenTK.csproj` project *directly* (that is passing it as parameter to `msbuild`), which causes a the `Xamarin.Android.Build.Tasks` assembly to be loaded for use in the `<UsingTask/>` msbuild statement, but at the same time `OpenTK.csproj` references the `Xamarin.Android.Build.Tasks` *project* which causes the ILRepacker task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the ILRepacker target not run every time but only whenver the assembly has to be re-packed because it has just been rebuilt.
jonpryor
pushed a commit
that referenced
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Jul 19, 2018
Xamarin.Android uses the [ILRepack task][0] to repack/merge the `Xamarin.Android.Build.Tasks.dll` assembly (610ade7), a step that is performed after the `Xamarin.Android.Build.Tasks.csproj` project's `Build` target completes. The step takes the project's output assembly -- `Xamarin.Android.Build.Tasks.dll` -- and several other dependencies, then merges them into one, *replacing* the original output assembly. The majority of time it works flawlessly, however when building the `monodroid` repo we observe a Mono runtime crash, similar-but-not- identical to [mono issue 9613][m9613]. Not all details are understood, but the high level overview of the issue is as follows: Mono runtime uses the **mmap**(2) system call on Unix to map the on-disk image of the assembly into memory. The `mmapp`ed area is used whenever the same assembly is loaded (e.g. `Assembly.LoadFrom()`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction: when an external process (or even the same Mono process!) writes to the file that was `mmapp`ed. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard: the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored; on Linux, the write leads either to the `SIGBUS` signal being sent to the process or corruption to the `mmap`ped memory area (details of how this happens are, as of yet, unknown; it's just a theory at this point). The problem occurs in our case when the `<ILRepacker/>` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually crashing: ## native crash #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 #4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 #5 <signal handler called> #6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 #7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 #8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 #9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 #10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 #11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 #12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 ... ## managed stacktrace at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Reflection.Assembly.LoadFrom (string,bool) [0x0001b] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Reflection.Assembly.LoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:539 at System.Reflection.Assembly.UnsafeLoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:571 at Microsoft.Build.Shared.TypeLoader.LoadAssembly (Microsoft.Build.Shared.AssemblyLoadInfo) [0x0001e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 ... The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks.dll`s `mmap`ed area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The crash this commit fixes occurs in a very specific scenario: when building the `OpenTK.csproj` project *directly* (e.g. `msbuild OpenTK.csproj`), which causes the `Xamarin.Android.Build.Tasks.dll` assembly to be loaded for use in the `<UsingTask/>` MSBuild statement, but at the same time `OpenTK.csproj` has a `@(ProjectReference)` to `Xamarin.Android.Build.Tasks.csproj`, which caused the `<ILRepacker/>` task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the `ILRepacker` target not run every time but only whenever the assembly has to be re-packed because it has just been rebuilt. This also improves rebuild times. [0]: https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task [m9613]: mono/mono#9613
jonpryor
pushed a commit
that referenced
this pull request
Aug 3, 2018
Xamarin.Android uses the [ILRepack task][0] to repack/merge the `Xamarin.Android.Build.Tasks.dll` assembly (610ade7), a step that is performed after the `Xamarin.Android.Build.Tasks.csproj` project's `Build` target completes. The step takes the project's output assembly -- `Xamarin.Android.Build.Tasks.dll` -- and several other dependencies, then merges them into one, *replacing* the original output assembly. The majority of time it works flawlessly, however when building the `monodroid` repo we observe a Mono runtime crash, similar-but-not- identical to [mono issue 9613][m9613]. Not all details are understood, but the high level overview of the issue is as follows: Mono runtime uses the **mmap**(2) system call on Unix to map the on-disk image of the assembly into memory. The `mmapp`ed area is used whenever the same assembly is loaded (e.g. `Assembly.LoadFrom()`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction: when an external process (or even the same Mono process!) writes to the file that was `mmapp`ed. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard: the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored; on Linux, the write leads either to the `SIGBUS` signal being sent to the process or corruption to the `mmap`ped memory area (details of how this happens are, as of yet, unknown; it's just a theory at this point). The problem occurs in our case when the `<ILRepacker/>` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually crashing: ## native crash #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 #4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 #5 <signal handler called> #6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 #7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 #8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 #9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 #10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 #11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 #12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 ... ## managed stacktrace at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Reflection.Assembly.LoadFrom (string,bool) [0x0001b] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Reflection.Assembly.LoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:539 at System.Reflection.Assembly.UnsafeLoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:571 at Microsoft.Build.Shared.TypeLoader.LoadAssembly (Microsoft.Build.Shared.AssemblyLoadInfo) [0x0001e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 ... The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks.dll`s `mmap`ed area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The crash this commit fixes occurs in a very specific scenario: when building the `OpenTK.csproj` project *directly* (e.g. `msbuild OpenTK.csproj`), which causes the `Xamarin.Android.Build.Tasks.dll` assembly to be loaded for use in the `<UsingTask/>` MSBuild statement, but at the same time `OpenTK.csproj` has a `@(ProjectReference)` to `Xamarin.Android.Build.Tasks.csproj`, which caused the `<ILRepacker/>` task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the `ILRepacker` target not run every time but only whenever the assembly has to be re-packed because it has just been rebuilt. This also improves rebuild times. [0]: https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task [m9613]: mono/mono#9613
lewurm
added a commit
to lewurm/xamarin-android
that referenced
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Nov 20, 2018
dellis1972
referenced
this pull request
in dellis1972/xamarin-android
Feb 5, 2019
When using fastdev typemaps we get the following error ``` 01-31 10:57:34.336 5802 5802 F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 in tid 5802 (haredandroidios), pid 5802 (haredandroidios) 01-31 10:57:34.358 5829 5829 I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstone 01-31 10:57:34.358 1685 1685 I /system/bin/tombstoned: received crash request for pid 5802 01-31 10:57:34.359 5829 5829 I crash_dump32: performing dump of process 5802 (target tid = 5802) 01-31 10:57:34.363 5829 5829 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** 01-31 10:57:34.363 5829 5829 F DEBUG : Build fingerprint: 'Android/sdk_phone_x86/generic_x86:9/PSR1.180720.012/4923214:userdebug/test-keys' 01-31 10:57:34.363 5829 5829 F DEBUG : Revision: '0' 01-31 10:57:34.363 5829 5829 F DEBUG : ABI: 'x86' 01-31 10:57:34.363 5829 5829 F DEBUG : pid: 5802, tid: 5802, name: haredandroidios >>> com.xamarin.blankformssharedandroidios <<< 01-31 10:57:34.363 5829 5829 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 01-31 10:57:34.363 5829 5829 F DEBUG : Cause: null pointer dereference 01-31 10:57:34.363 5829 5829 F DEBUG : eax 00000000 ebx e6b2e754 ecx 00000000 edx 00000000 01-31 10:57:34.363 5829 5829 F DEBUG : edi e0cc58f0 esi 00000000 01-31 10:57:34.363 5829 5829 F DEBUG : ebp ffd85ff8 esp ffd85fcc eip e6a60532 01-31 10:57:34.459 5829 5829 F DEBUG : 01-31 10:57:34.459 5829 5829 F DEBUG : backtrace: 01-31 10:57:34.459 5829 5829 F DEBUG : #00 pc 0001e532 /system/lib/libc.so (strlen+18) 01-31 10:57:34.459 5829 5829 F DEBUG : #1 pc 00075952 /system/lib/libc.so (strdup+34) 01-31 10:57:34.459 5829 5829 F DEBUG : #2 pc 0000f6ab /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::add_type_mapping(xamarin::android::internal::TypeMappingInfo**, char const*, char const*, char const*)+667) 01-31 10:57:34.459 5829 5829 F DEBUG : #3 pc 00010ed7 /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::try_load_typemaps_from_directory(char const*)+871) 01-31 10:57:34.459 5829 5829 F DEBUG : #4 pc 000233b8 /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (gather_bundled_assemblies(_JNIEnv*, xamarin::android::jstring_array_wrapper&, bool, int*)+248) 01-31 10:57:34.459 5829 5829 F DEBUG : #5 pc 000229c6 /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (create_domain(_JNIEnv*, _jclass*, xamarin::android::jstring_array_wrapper&, _jstring*, _jobject*, bool)+166) 01-31 10:57:34.459 5829 5829 F DEBUG : #6 pc 0001f20c /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (create_and_initialize_domain(_JNIEnv*, _jclass*, xamarin::android::jstring_array_wrapper&, _jobjectArray*, _jobject*, bool)+204) 01-31 10:57:34.460 5829 5829 F DEBUG : #7 pc 0001c7af /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (Java_mono_android_Runtime_init+4255) ``` The was down to the `try_load_typemaps_from_directory` passing a `nullptr` to the `add_type_mapping` method. This method was calling `strdup`, which does NOT like `nullptr`. Since the `source_entry` argument is only used for logging we migth as well create a constant string with a value of `.__override__` so that if there is a problem we can see from the logs this was a fastdev issue.
jonpryor
pushed a commit
that referenced
this pull request
Feb 5, 2019
When using fastdev typemaps files we get the following error: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 in tid 5802 (haredandroidios), pid 5802 (haredandroidios) I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 5802 I crash_dump32: performing dump of process 5802 (target tid = 5802) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86/generic_x86:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86' F DEBUG : pid: 5802, tid: 5802, name: haredandroidios >>> com.xamarin.blankformssharedandroidios <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 F DEBUG : Cause: null pointer dereference F DEBUG : eax 00000000 ebx e6b2e754 ecx 00000000 edx 00000000 F DEBUG : edi e0cc58f0 esi 00000000 F DEBUG : ebp ffd85ff8 esp ffd85fcc eip e6a60532 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0001e532 /system/lib/libc.so (strlen+18) F DEBUG : #1 pc 00075952 /system/lib/libc.so (strdup+34) F DEBUG : #2 pc 0000f6ab /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::add_type_mapping(xamarin::android::internal::TypeMappingInfo**, char const*, char const*, char const*)+667) F DEBUG : #3 pc 00010ed7 /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::try_load_typemaps_from_directory(char const*)+871) F DEBUG : #4 pc 000233b8 /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (gather_bundled_assemblies(_JNIEnv*, xamarin::android::jstring_array_wrapper&, bool, int*)+248) F DEBUG : #5 pc 000229c6 /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (create_domain(_JNIEnv*, _jclass*, xamarin::android::jstring_array_wrapper&, _jstring*, _jobject*, bool)+166) F DEBUG : #6 pc 0001f20c /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (create_and_initialize_domain(_JNIEnv*, _jclass*, xamarin::android::jstring_array_wrapper&, _jobjectArray*, _jobject*, bool)+204) F DEBUG : #7 pc 0001c7af /data/app/com.xamarin.blankformssharedandroidios-nCq7hL5Bz-TYILJl3W97zw==/lib/x86/libmonodroid.so (Java_mono_android_Runtime_init+4255) The was down to the `try_load_typemaps_from_directory()` passing a `nullptr` to the `add_type_mapping()` method. This method was calling **strdup**(3), which does NOT like `nullptr`. Since the `source_entry` argument is only used for logging we might as well create a constant string with a value of `.__override__` so that if there is a problem we can see from the logs this was a fastdev issue.
jonpryor
pushed a commit
that referenced
this pull request
Apr 9, 2020
Context: https://github.com/jfversluis/SwipeViewDemo Context: https://github.com/xamarin/Xamarin.Forms/blob/fa33ca3b3ac5c7c875023db785b56c67015e13b1/Xamarin.Forms.Platform.Android/AppCompat/TabbedPageRenderer.cs#L512 Commit 7117414 introduced native code which queries the Mono runtime to obtain an instance of a `MonoClass` for a given `MonoReflectionType` as well as the `MonoImage` associated with the `MonoClass`: // EmbeddedAssemblies::typemap_managed_to_java(MonoReflectionType *reflection_type, const uint8_t *mvid) MonoReflectionType *reflection_type = … MonoType *type = mono_reflection_type_get_type (reflection_type); MonoClass *klass = mono_type_get_class (type); // PROBLEMATIC // EmbeddedAssemblies::typemap_managed_to_java(MonoType *type, MonoClass *klass, const uint8_t *mvid) MonoImage *image = mono_class_get_image (klass); However, it appears that when dealing with closed generic types -- such as with `new GenericHolder<int>()` -- the above call chain results in a SIGSEGV instead of a valid `MonoImage*`: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3000021 in tid 19030 (s.swipeviewdemo), pid 19030 (s.swipeviewdemo) I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 19030 I crash_dump32: performing dump of process 19030 (target tid = 19030) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'google/sdk_gphone_x86/generic_x86:10/QSR1.191030.002/5978551:userdebug/dev-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86' F DEBUG : Timestamp: 2020-04-08 15:52:55+0200 F DEBUG : pid: 19030, tid: 19030, name: s.swipeviewdemo >>> nl.versluis.swipeviewdemo <<< F DEBUG : uid: 10135 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3000021 F DEBUG : eax 03000005 ebx cb9f4d24 ecx 7191c13b edx 00000004 F DEBUG : edi 03000005 esi ffb22080 F DEBUG : ebp ffb22108 esp ffb2206c eip cbcfc1e4 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 001b41e4 /data/app/Mono.Android.DebugRuntime-umHhDz421s4-tshrHwha0w==/lib/x86/libmonosgen-32bit-2.0.so (mono_image_get_name+4) F DEBUG : #1 pc 0000cac7 /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(_MonoType*, _MonoClass*, unsigned char const*)+263) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #2 pc 0000c8cc /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(_MonoReflectionType*, unsigned char const*)+124) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #3 pc 0001621a /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::MonodroidRuntime::typemap_managed_to_java(_MonoReflectionType*, unsigned char const*)+42) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #4 pc 000325af <anonymous:c7858000> Investigating the issue I discovered that one of two things happened: 1. the returned `MonoImage` instance was invalid, *or* 2. the instance was valid but image name stored in `MonoImage` was `null` (1) would only happen in 32-bit builds, resulting in a SIGSEGV within `mono_image_get_name()`, because the `image` pointer value of 0x3000005 was invalid: I monodroid: const char *xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(MonoType *, MonoClass *, const uint8_t *) I monodroid: type == 0xc6e60d3c, klass == 0xc6e60cb8, mvid == 0xc8c02d90 I monodroid: type name == Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[Xamarin.Forms.Page] I monodroid: calling mono_class_get_image (0xc6e60cb8) I monodroid: image == 0x3000005 (2) only happened in 64-bit builds, resulting in a SIGSEGV as `strlen()` was passed a `null` pointer: I monodroid: const char *xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(MonoType *, MonoClass *, const uint8_t *) I monodroid: type == 0x7ce3fecc78, klass == 0x7ce3fecb98, mvid == 0x7ce9404520 I monodroid: type name == Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[Xamarin.Forms.Page] I monodroid: calling mono_class_get_image (0x7ce3fecb98) I monodroid: image == 0x7ce3fecbc8 I monodroid: image_name == <null> I found out that the root cause was in the `mono_type_get_class()` call which is supposed to be used with great caution as it eventually calls the `mono_type_get_class_internal()` function which is supposed to be called only for object types `MONO_TYPE_CLASS` and `MONO_TYPE_VALUETYPE` but not `MONO_TYPE_GENERICINST`, and `MONO_TYPE_GENERICINST` is used for closed generic types. The fix is to call the `mono_class_from_mono_type()` function instead which, albeit slower, is safer and works correctly in all cases: // EmbeddedAssemblies::typemap_managed_to_java(MonoReflectionType *reflection_type, const uint8_t *mvid) MonoReflectionType *reflection_type = … MonoType *type = mono_reflection_type_get_type (reflection_type); MonoClass *klass = mono_class_from_mono_type (type); // PART OF THE FIX // EmbeddedAssemblies::typemap_managed_to_java(MonoType *type, MonoClass *klass, const uint8_t *mvid) MonoImage *image = mono_class_get_image (klass) Fixing this led to the next issue, a managed exception thrown after the runtime failed to map a managed type name to Java type name: W monodroid-assembly: typemap: unable to find mapping to a Java type from managed type 'Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T], Xamarin.Forms.Platform.Android' I monodroid-timing: Typemap.managed_to_java: end, total time; elapsed: 0s:0::33177 D Mono : DllImport attempting to load: '/system/lib64/liblog.so'. D Mono : DllImport loaded library '/system/lib64/liblog.so'. D Mono : DllImport searching in: '/system/lib64/liblog.so' ('/system/lib64/liblog.so'). D Mono : Searching for '__android_log_print'. D Mono : Probing '__android_log_print'. D Mono : Found as '__android_log_print'. I MonoDroid: UNHANDLED EXCEPTION: I MonoDroid: System.NotSupportedException: Cannot create instance of type 'Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[[Xamarin.Forms.Page, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]': no Java peer type found. I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods..ctor (System.Type declaringType) [0x0004b] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods.GetConstructorsForType (System.Type declaringType) [0x00031] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods.StartCreateInstance (System.String constructorSignature, System.Type declaringType, Java.Interop.JniArgumentValue* parameters) [0x00038] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Android.Support.V4.App.FragmentPagerAdapter..ctor (Android.Support.V4.App.FragmentManager fm) [0x0005b] in <fefee6c2c695459088a9df092723e052>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T]..ctor (Xamarin.Forms.MultiPage`1[T] page, Android.Support.V4.App.FragmentManager fragmentManager) [0x00000] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.TabbedPageRenderer.CreateFormsViewPager (Android.Content.Context context, Xamarin.Forms.TabbedPage tabbedPage) [0x00033] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.TabbedPageRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x001cd] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000c0] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00033] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x0001f] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.AddChild (Xamarin.Forms.Page page, System.Boolean layout) [0x0000d] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPageInternal (Xamarin.Forms.Page newRoot) [0x00061] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x000e6] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0003f] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.SetMainPage () [0x0000c] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x00140] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at SwipeViewDemo.Droid.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x00035] in <15e30af50bb64ff6b6d20ac6fd546763>:0 I MonoDroid: at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <515e813169e54876823978ab785f569a>:0 I MonoDroid: at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.7(intptr,intptr,intptr) Note that the type name as seen by the native code via `mono_get_type_name_full()` is: Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T], Xamarin.Forms.Platform.Android while `Mono.Android.dll` expects to be looking for: Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1, Xamarin.Forms.Platform.Android This discrepancy was caused by calling `mono_get_type_name_full()` with its format parameter set to `MONO_TYPE_NAME_FORMAT_REFLECTION`, while we needed the format value of `MONO_TYPE_NAME_FORMAT_FULL_NAME`.
jonpryor
pushed a commit
that referenced
this pull request
Apr 9, 2020
Context: https://github.com/jfversluis/SwipeViewDemo Context: https://github.com/xamarin/Xamarin.Forms/blob/fa33ca3b3ac5c7c875023db785b56c67015e13b1/Xamarin.Forms.Platform.Android/AppCompat/TabbedPageRenderer.cs#L512 Commit 7117414 introduced native code which queries the Mono runtime to obtain an instance of a `MonoClass` for a given `MonoReflectionType` as well as the `MonoImage` associated with the `MonoClass`: // EmbeddedAssemblies::typemap_managed_to_java(MonoReflectionType *reflection_type, const uint8_t *mvid) MonoReflectionType *reflection_type = … MonoType *type = mono_reflection_type_get_type (reflection_type); MonoClass *klass = mono_type_get_class (type); // PROBLEMATIC // EmbeddedAssemblies::typemap_managed_to_java(MonoType *type, MonoClass *klass, const uint8_t *mvid) MonoImage *image = mono_class_get_image (klass); However, it appears that when dealing with closed generic types -- such as with `new GenericHolder<int>()` -- the above call chain results in a SIGSEGV instead of a valid `MonoImage*`: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3000021 in tid 19030 (s.swipeviewdemo), pid 19030 (s.swipeviewdemo) I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 19030 I crash_dump32: performing dump of process 19030 (target tid = 19030) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'google/sdk_gphone_x86/generic_x86:10/QSR1.191030.002/5978551:userdebug/dev-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86' F DEBUG : Timestamp: 2020-04-08 15:52:55+0200 F DEBUG : pid: 19030, tid: 19030, name: s.swipeviewdemo >>> nl.versluis.swipeviewdemo <<< F DEBUG : uid: 10135 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3000021 F DEBUG : eax 03000005 ebx cb9f4d24 ecx 7191c13b edx 00000004 F DEBUG : edi 03000005 esi ffb22080 F DEBUG : ebp ffb22108 esp ffb2206c eip cbcfc1e4 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 001b41e4 /data/app/Mono.Android.DebugRuntime-umHhDz421s4-tshrHwha0w==/lib/x86/libmonosgen-32bit-2.0.so (mono_image_get_name+4) F DEBUG : #1 pc 0000cac7 /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(_MonoType*, _MonoClass*, unsigned char const*)+263) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #2 pc 0000c8cc /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(_MonoReflectionType*, unsigned char const*)+124) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #3 pc 0001621a /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::MonodroidRuntime::typemap_managed_to_java(_MonoReflectionType*, unsigned char const*)+42) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #4 pc 000325af <anonymous:c7858000> Investigating the issue I discovered that one of two things happened: 1. the returned `MonoImage` instance was invalid, *or* 2. the instance was valid but image name stored in `MonoImage` was `null` (1) would only happen in 32-bit builds, resulting in a SIGSEGV within `mono_image_get_name()`, because the `image` pointer value of 0x3000005 was invalid: I monodroid: const char *xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(MonoType *, MonoClass *, const uint8_t *) I monodroid: type == 0xc6e60d3c, klass == 0xc6e60cb8, mvid == 0xc8c02d90 I monodroid: type name == Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[Xamarin.Forms.Page] I monodroid: calling mono_class_get_image (0xc6e60cb8) I monodroid: image == 0x3000005 (2) only happened in 64-bit builds, resulting in a SIGSEGV as `strlen()` was passed a `null` pointer: I monodroid: const char *xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(MonoType *, MonoClass *, const uint8_t *) I monodroid: type == 0x7ce3fecc78, klass == 0x7ce3fecb98, mvid == 0x7ce9404520 I monodroid: type name == Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[Xamarin.Forms.Page] I monodroid: calling mono_class_get_image (0x7ce3fecb98) I monodroid: image == 0x7ce3fecbc8 I monodroid: image_name == <null> I found out that the root cause was in the `mono_type_get_class()` call which is supposed to be used with great caution as it eventually calls the `mono_type_get_class_internal()` function which is supposed to be called only for object types `MONO_TYPE_CLASS` and `MONO_TYPE_VALUETYPE` but not `MONO_TYPE_GENERICINST`, and `MONO_TYPE_GENERICINST` is used for closed generic types. The fix is to call the `mono_class_from_mono_type()` function instead which, albeit slower, is safer and works correctly in all cases: // EmbeddedAssemblies::typemap_managed_to_java(MonoReflectionType *reflection_type, const uint8_t *mvid) MonoReflectionType *reflection_type = … MonoType *type = mono_reflection_type_get_type (reflection_type); MonoClass *klass = mono_class_from_mono_type (type); // PART OF THE FIX // EmbeddedAssemblies::typemap_managed_to_java(MonoType *type, MonoClass *klass, const uint8_t *mvid) MonoImage *image = mono_class_get_image (klass) Fixing this led to the next issue, a managed exception thrown after the runtime failed to map a managed type name to Java type name: W monodroid-assembly: typemap: unable to find mapping to a Java type from managed type 'Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T], Xamarin.Forms.Platform.Android' I monodroid-timing: Typemap.managed_to_java: end, total time; elapsed: 0s:0::33177 D Mono : DllImport attempting to load: '/system/lib64/liblog.so'. D Mono : DllImport loaded library '/system/lib64/liblog.so'. D Mono : DllImport searching in: '/system/lib64/liblog.so' ('/system/lib64/liblog.so'). D Mono : Searching for '__android_log_print'. D Mono : Probing '__android_log_print'. D Mono : Found as '__android_log_print'. I MonoDroid: UNHANDLED EXCEPTION: I MonoDroid: System.NotSupportedException: Cannot create instance of type 'Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[[Xamarin.Forms.Page, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]': no Java peer type found. I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods..ctor (System.Type declaringType) [0x0004b] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods.GetConstructorsForType (System.Type declaringType) [0x00031] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods.StartCreateInstance (System.String constructorSignature, System.Type declaringType, Java.Interop.JniArgumentValue* parameters) [0x00038] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Android.Support.V4.App.FragmentPagerAdapter..ctor (Android.Support.V4.App.FragmentManager fm) [0x0005b] in <fefee6c2c695459088a9df092723e052>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T]..ctor (Xamarin.Forms.MultiPage`1[T] page, Android.Support.V4.App.FragmentManager fragmentManager) [0x00000] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.TabbedPageRenderer.CreateFormsViewPager (Android.Content.Context context, Xamarin.Forms.TabbedPage tabbedPage) [0x00033] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.TabbedPageRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x001cd] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000c0] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00033] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x0001f] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.AddChild (Xamarin.Forms.Page page, System.Boolean layout) [0x0000d] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPageInternal (Xamarin.Forms.Page newRoot) [0x00061] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x000e6] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0003f] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.SetMainPage () [0x0000c] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x00140] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at SwipeViewDemo.Droid.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x00035] in <15e30af50bb64ff6b6d20ac6fd546763>:0 I MonoDroid: at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <515e813169e54876823978ab785f569a>:0 I MonoDroid: at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.7(intptr,intptr,intptr) Note that the type name as seen by the native code via `mono_get_type_name_full()` is: Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T], Xamarin.Forms.Platform.Android while `Mono.Android.dll` expects to be looking for: Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1, Xamarin.Forms.Platform.Android This discrepancy was caused by calling `mono_get_type_name_full()` with its format parameter set to `MONO_TYPE_NAME_FORMAT_REFLECTION`, while we needed the format value of `MONO_TYPE_NAME_FORMAT_FULL_NAME`.
jonpryor
pushed a commit
that referenced
this pull request
Apr 9, 2020
Context: https://github.com/jfversluis/SwipeViewDemo Context: https://github.com/xamarin/Xamarin.Forms/blob/fa33ca3b3ac5c7c875023db785b56c67015e13b1/Xamarin.Forms.Platform.Android/AppCompat/TabbedPageRenderer.cs#L512 Commit 7117414 introduced native code which queries the Mono runtime to obtain an instance of a `MonoClass` for a given `MonoReflectionType` as well as the `MonoImage` associated with the `MonoClass`: // EmbeddedAssemblies::typemap_managed_to_java(MonoReflectionType *reflection_type, const uint8_t *mvid) MonoReflectionType *reflection_type = … MonoType *type = mono_reflection_type_get_type (reflection_type); MonoClass *klass = mono_type_get_class (type); // PROBLEMATIC // EmbeddedAssemblies::typemap_managed_to_java(MonoType *type, MonoClass *klass, const uint8_t *mvid) MonoImage *image = mono_class_get_image (klass); However, it appears that when dealing with closed generic types -- such as with `new GenericHolder<int>()` -- the above call chain results in a SIGSEGV instead of a valid `MonoImage*`: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3000021 in tid 19030 (s.swipeviewdemo), pid 19030 (s.swipeviewdemo) I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 19030 I crash_dump32: performing dump of process 19030 (target tid = 19030) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'google/sdk_gphone_x86/generic_x86:10/QSR1.191030.002/5978551:userdebug/dev-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86' F DEBUG : Timestamp: 2020-04-08 15:52:55+0200 F DEBUG : pid: 19030, tid: 19030, name: s.swipeviewdemo >>> nl.versluis.swipeviewdemo <<< F DEBUG : uid: 10135 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3000021 F DEBUG : eax 03000005 ebx cb9f4d24 ecx 7191c13b edx 00000004 F DEBUG : edi 03000005 esi ffb22080 F DEBUG : ebp ffb22108 esp ffb2206c eip cbcfc1e4 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 001b41e4 /data/app/Mono.Android.DebugRuntime-umHhDz421s4-tshrHwha0w==/lib/x86/libmonosgen-32bit-2.0.so (mono_image_get_name+4) F DEBUG : #1 pc 0000cac7 /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(_MonoType*, _MonoClass*, unsigned char const*)+263) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #2 pc 0000c8cc /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(_MonoReflectionType*, unsigned char const*)+124) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #3 pc 0001621a /data/app/nl.versluis.swipeviewdemo-jCFH_bcCNuFx1tLUhaJ4nw==/lib/x86/libmonodroid.so (xamarin::android::internal::MonodroidRuntime::typemap_managed_to_java(_MonoReflectionType*, unsigned char const*)+42) (BuildId: a2585ad379f788049e463af58c8686e9cdc1e778) F DEBUG : #4 pc 000325af <anonymous:c7858000> Investigating the issue I discovered that one of two things happened: 1. the returned `MonoImage` instance was invalid, *or* 2. the instance was valid but image name stored in `MonoImage` was `null` (1) would only happen in 32-bit builds, resulting in a SIGSEGV within `mono_image_get_name()`, because the `image` pointer value of 0x3000005 was invalid: I monodroid: const char *xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(MonoType *, MonoClass *, const uint8_t *) I monodroid: type == 0xc6e60d3c, klass == 0xc6e60cb8, mvid == 0xc8c02d90 I monodroid: type name == Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[Xamarin.Forms.Page] I monodroid: calling mono_class_get_image (0xc6e60cb8) I monodroid: image == 0x3000005 (2) only happened in 64-bit builds, resulting in a SIGSEGV as `strlen()` was passed a `null` pointer: I monodroid: const char *xamarin::android::internal::EmbeddedAssemblies::typemap_managed_to_java(MonoType *, MonoClass *, const uint8_t *) I monodroid: type == 0x7ce3fecc78, klass == 0x7ce3fecb98, mvid == 0x7ce9404520 I monodroid: type name == Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[Xamarin.Forms.Page] I monodroid: calling mono_class_get_image (0x7ce3fecb98) I monodroid: image == 0x7ce3fecbc8 I monodroid: image_name == <null> I found out that the root cause was in the `mono_type_get_class()` call which is supposed to be used with great caution as it eventually calls the `mono_type_get_class_internal()` function which is supposed to be called only for object types `MONO_TYPE_CLASS` and `MONO_TYPE_VALUETYPE` but not `MONO_TYPE_GENERICINST`, and `MONO_TYPE_GENERICINST` is used for closed generic types. The fix is to call the `mono_class_from_mono_type()` function instead which, albeit slower, is safer and works correctly in all cases: // EmbeddedAssemblies::typemap_managed_to_java(MonoReflectionType *reflection_type, const uint8_t *mvid) MonoReflectionType *reflection_type = … MonoType *type = mono_reflection_type_get_type (reflection_type); MonoClass *klass = mono_class_from_mono_type (type); // PART OF THE FIX // EmbeddedAssemblies::typemap_managed_to_java(MonoType *type, MonoClass *klass, const uint8_t *mvid) MonoImage *image = mono_class_get_image (klass) Fixing this led to the next issue, a managed exception thrown after the runtime failed to map a managed type name to Java type name: W monodroid-assembly: typemap: unable to find mapping to a Java type from managed type 'Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T], Xamarin.Forms.Platform.Android' I monodroid-timing: Typemap.managed_to_java: end, total time; elapsed: 0s:0::33177 D Mono : DllImport attempting to load: '/system/lib64/liblog.so'. D Mono : DllImport loaded library '/system/lib64/liblog.so'. D Mono : DllImport searching in: '/system/lib64/liblog.so' ('/system/lib64/liblog.so'). D Mono : Searching for '__android_log_print'. D Mono : Probing '__android_log_print'. D Mono : Found as '__android_log_print'. I MonoDroid: UNHANDLED EXCEPTION: I MonoDroid: System.NotSupportedException: Cannot create instance of type 'Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[[Xamarin.Forms.Page, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]': no Java peer type found. I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods..ctor (System.Type declaringType) [0x0004b] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods.GetConstructorsForType (System.Type declaringType) [0x00031] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Java.Interop.JniPeerMembers+JniInstanceMethods.StartCreateInstance (System.String constructorSignature, System.Type declaringType, Java.Interop.JniArgumentValue* parameters) [0x00038] in <514e1249792e47a180b3f1293306b972>:0 I MonoDroid: at Android.Support.V4.App.FragmentPagerAdapter..ctor (Android.Support.V4.App.FragmentManager fm) [0x0005b] in <fefee6c2c695459088a9df092723e052>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T]..ctor (Xamarin.Forms.MultiPage`1[T] page, Android.Support.V4.App.FragmentManager fragmentManager) [0x00000] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.TabbedPageRenderer.CreateFormsViewPager (Android.Content.Context context, Xamarin.Forms.TabbedPage tabbedPage) [0x00033] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.TabbedPageRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x001cd] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000c0] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00033] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x0001f] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.AddChild (Xamarin.Forms.Page page, System.Boolean layout) [0x0000d] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPageInternal (Xamarin.Forms.Page newRoot) [0x00061] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x000e6] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0003f] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.SetMainPage () [0x0000c] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x00140] in <9d12bb15abb54c508c4bee636d1b3a42>:0 I MonoDroid: at SwipeViewDemo.Droid.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x00035] in <15e30af50bb64ff6b6d20ac6fd546763>:0 I MonoDroid: at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <515e813169e54876823978ab785f569a>:0 I MonoDroid: at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.7(intptr,intptr,intptr) Note that the type name as seen by the native code via `mono_get_type_name_full()` is: Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1[T], Xamarin.Forms.Platform.Android while `Mono.Android.dll` expects to be looking for: Xamarin.Forms.Platform.Android.AppCompat.FormsFragmentPagerAdapter`1, Xamarin.Forms.Platform.Android This discrepancy was caused by calling `mono_get_type_name_full()` with its format parameter set to `MONO_TYPE_NAME_FORMAT_REFLECTION`, while we needed the format value of `MONO_TYPE_NAME_FORMAT_FULL_NAME`.
jonpryor
pushed a commit
that referenced
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May 11, 2020
…4673) Fixes: #4596 Context: a017561 Context: https://gist.github.com/pjcollins/87762e81f1f3c7e8b821356e4612eecf A missing parameter in a call to `log_debug` added iFixes: #4596 Context: a017561 Context: https://gist.github.com/pjcollins/87762e81f1f3c7e8b821356e4612eecf A missing parameter in a call to `log_debug()` added in a017561 may lead to a segfault when `assembly` log category and `debug` log level are enabled: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 in tid 922 (DrawableTinting), pid 922 (DrawableTinting) I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 922 I crash_dump64: performing dump of process 922 (target tid = 922) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86_64' F DEBUG : pid: 922, tid: 922, name: DrawableTinting >>> com.xamarin.DrawableTinting <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 F DEBUG : Cause: null pointer dereference F DEBUG : rax 0000000000000000 rbx 00007ffed3c283c0 rcx 0000000000000003 rdx 0000000000000002 F DEBUG : r8 00007ffed3c283c0 r9 00000000ffffffff r10 00007ffed3c283d0 r11 00007ffed3c28824 F DEBUG : r12 00007c88774a2f17 r13 00000000ffffffff r14 0000000000000000 r15 00007ffed3c283d0 F DEBUG : rdi 0000000000000003 rsi 00007ffed3c283bb F DEBUG : rbp 00007ffed3c28f18 rsp 00007ffed3c28288 rip 00007c890f860761 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0000000000020761 /system/lib64/libc.so (strlen+17) F DEBUG : #1 pc 000000000006e761 /system/lib64/libc.so (__vfprintf+5953) F DEBUG : #2 pc 000000000008df5d /system/lib64/libc.so (vsnprintf+189) F DEBUG : #3 pc 0000000000007b60 /system/lib64/liblog.so (__android_log_vprint+64) F DEBUG : #4 pc 000000000001350c /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (log_debug_nocheck(_LogCategories, char const*, ...)+204) F DEBUG : #5 pc 000000000000de6a /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+538) F DEBUG : #6 pc 000000000000df13 /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) F DEBUG : #7 pc 00000000000d57f8 <anonymous:0000000042d04000> Add the missing parameter to prevent the `SIGSEGV` from happening.n a017561 may lead to a segfault when `assembly` log category and `debug` log level are enabled: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 in tid 922 (DrawableTinting), pid 922 (DrawableTinting) I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 922 I crash_dump64: performing dump of process 922 (target tid = 922) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86_64' F DEBUG : pid: 922, tid: 922, name: DrawableTinting >>> com.xamarin.DrawableTinting <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 F DEBUG : Cause: null pointer dereference F DEBUG : rax 0000000000000000 rbx 00007ffed3c283c0 rcx 0000000000000003 rdx 0000000000000002 F DEBUG : r8 00007ffed3c283c0 r9 00000000ffffffff r10 00007ffed3c283d0 r11 00007ffed3c28824 F DEBUG : r12 00007c88774a2f17 r13 00000000ffffffff r14 0000000000000000 r15 00007ffed3c283d0 F DEBUG : rdi 0000000000000003 rsi 00007ffed3c283bb F DEBUG : rbp 00007ffed3c28f18 rsp 00007ffed3c28288 rip 00007c890f860761 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0000000000020761 /system/lib64/libc.so (strlen+17) F DEBUG : #1 pc 000000000006e761 /system/lib64/libc.so (__vfprintf+5953) F DEBUG : #2 pc 000000000008df5d /system/lib64/libc.so (vsnprintf+189) F DEBUG : #3 pc 0000000000007b60 /system/lib64/liblog.so (__android_log_vprint+64) F DEBUG : #4 pc 000000000001350c /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (log_debug_nocheck(_LogCategories, char const*, ...)+204) F DEBUG : #5 pc 000000000000de6a /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+538) F DEBUG : #6 pc 000000000000df13 /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) F DEBUG : #7 pc 00000000000d57f8 <anonymous:0000000042d04000> Add the missing parameter to prevent the `SIGSEGV` from happening.
jonpryor
pushed a commit
that referenced
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May 12, 2020
…4673) Fixes: #4596 Context: a017561 Context: https://gist.github.com/pjcollins/87762e81f1f3c7e8b821356e4612eecf A missing parameter in a call to `log_debug` added iFixes: #4596 Context: a017561 Context: https://gist.github.com/pjcollins/87762e81f1f3c7e8b821356e4612eecf A missing parameter in a call to `log_debug()` added in a017561 may lead to a segfault when `assembly` log category and `debug` log level are enabled: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 in tid 922 (DrawableTinting), pid 922 (DrawableTinting) I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 922 I crash_dump64: performing dump of process 922 (target tid = 922) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86_64' F DEBUG : pid: 922, tid: 922, name: DrawableTinting >>> com.xamarin.DrawableTinting <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 F DEBUG : Cause: null pointer dereference F DEBUG : rax 0000000000000000 rbx 00007ffed3c283c0 rcx 0000000000000003 rdx 0000000000000002 F DEBUG : r8 00007ffed3c283c0 r9 00000000ffffffff r10 00007ffed3c283d0 r11 00007ffed3c28824 F DEBUG : r12 00007c88774a2f17 r13 00000000ffffffff r14 0000000000000000 r15 00007ffed3c283d0 F DEBUG : rdi 0000000000000003 rsi 00007ffed3c283bb F DEBUG : rbp 00007ffed3c28f18 rsp 00007ffed3c28288 rip 00007c890f860761 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0000000000020761 /system/lib64/libc.so (strlen+17) F DEBUG : #1 pc 000000000006e761 /system/lib64/libc.so (__vfprintf+5953) F DEBUG : #2 pc 000000000008df5d /system/lib64/libc.so (vsnprintf+189) F DEBUG : #3 pc 0000000000007b60 /system/lib64/liblog.so (__android_log_vprint+64) F DEBUG : #4 pc 000000000001350c /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (log_debug_nocheck(_LogCategories, char const*, ...)+204) F DEBUG : #5 pc 000000000000de6a /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+538) F DEBUG : #6 pc 000000000000df13 /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) F DEBUG : #7 pc 00000000000d57f8 <anonymous:0000000042d04000> Add the missing parameter to prevent the `SIGSEGV` from happening.n a017561 may lead to a segfault when `assembly` log category and `debug` log level are enabled: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 in tid 922 (DrawableTinting), pid 922 (DrawableTinting) I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 922 I crash_dump64: performing dump of process 922 (target tid = 922) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86_64' F DEBUG : pid: 922, tid: 922, name: DrawableTinting >>> com.xamarin.DrawableTinting <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 F DEBUG : Cause: null pointer dereference F DEBUG : rax 0000000000000000 rbx 00007ffed3c283c0 rcx 0000000000000003 rdx 0000000000000002 F DEBUG : r8 00007ffed3c283c0 r9 00000000ffffffff r10 00007ffed3c283d0 r11 00007ffed3c28824 F DEBUG : r12 00007c88774a2f17 r13 00000000ffffffff r14 0000000000000000 r15 00007ffed3c283d0 F DEBUG : rdi 0000000000000003 rsi 00007ffed3c283bb F DEBUG : rbp 00007ffed3c28f18 rsp 00007ffed3c28288 rip 00007c890f860761 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0000000000020761 /system/lib64/libc.so (strlen+17) F DEBUG : #1 pc 000000000006e761 /system/lib64/libc.so (__vfprintf+5953) F DEBUG : #2 pc 000000000008df5d /system/lib64/libc.so (vsnprintf+189) F DEBUG : #3 pc 0000000000007b60 /system/lib64/liblog.so (__android_log_vprint+64) F DEBUG : #4 pc 000000000001350c /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (log_debug_nocheck(_LogCategories, char const*, ...)+204) F DEBUG : #5 pc 000000000000de6a /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+538) F DEBUG : #6 pc 000000000000df13 /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) F DEBUG : #7 pc 00000000000d57f8 <anonymous:0000000042d04000> Add the missing parameter to prevent the `SIGSEGV` from happening.
jonpryor
pushed a commit
that referenced
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May 12, 2020
…4673) Fixes: #4596 Context: a017561 Context: https://gist.github.com/pjcollins/87762e81f1f3c7e8b821356e4612eecf A missing parameter in a call to `log_debug` added iFixes: #4596 Context: a017561 Context: https://gist.github.com/pjcollins/87762e81f1f3c7e8b821356e4612eecf A missing parameter in a call to `log_debug()` added in a017561 may lead to a segfault when `assembly` log category and `debug` log level are enabled: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 in tid 922 (DrawableTinting), pid 922 (DrawableTinting) I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 922 I crash_dump64: performing dump of process 922 (target tid = 922) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86_64' F DEBUG : pid: 922, tid: 922, name: DrawableTinting >>> com.xamarin.DrawableTinting <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 F DEBUG : Cause: null pointer dereference F DEBUG : rax 0000000000000000 rbx 00007ffed3c283c0 rcx 0000000000000003 rdx 0000000000000002 F DEBUG : r8 00007ffed3c283c0 r9 00000000ffffffff r10 00007ffed3c283d0 r11 00007ffed3c28824 F DEBUG : r12 00007c88774a2f17 r13 00000000ffffffff r14 0000000000000000 r15 00007ffed3c283d0 F DEBUG : rdi 0000000000000003 rsi 00007ffed3c283bb F DEBUG : rbp 00007ffed3c28f18 rsp 00007ffed3c28288 rip 00007c890f860761 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0000000000020761 /system/lib64/libc.so (strlen+17) F DEBUG : #1 pc 000000000006e761 /system/lib64/libc.so (__vfprintf+5953) F DEBUG : #2 pc 000000000008df5d /system/lib64/libc.so (vsnprintf+189) F DEBUG : #3 pc 0000000000007b60 /system/lib64/liblog.so (__android_log_vprint+64) F DEBUG : #4 pc 000000000001350c /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (log_debug_nocheck(_LogCategories, char const*, ...)+204) F DEBUG : #5 pc 000000000000de6a /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+538) F DEBUG : #6 pc 000000000000df13 /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) F DEBUG : #7 pc 00000000000d57f8 <anonymous:0000000042d04000> Add the missing parameter to prevent the `SIGSEGV` from happening.n a017561 may lead to a segfault when `assembly` log category and `debug` log level are enabled: F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 in tid 922 (DrawableTinting), pid 922 (DrawableTinting) I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone I /system/bin/tombstoned: received crash request for pid 922 I crash_dump64: performing dump of process 922 (target tid = 922) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:9/PSR1.180720.012/4923214:userdebug/test-keys' F DEBUG : Revision: '0' F DEBUG : ABI: 'x86_64' F DEBUG : pid: 922, tid: 922, name: DrawableTinting >>> com.xamarin.DrawableTinting <<< F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x3 F DEBUG : Cause: null pointer dereference F DEBUG : rax 0000000000000000 rbx 00007ffed3c283c0 rcx 0000000000000003 rdx 0000000000000002 F DEBUG : r8 00007ffed3c283c0 r9 00000000ffffffff r10 00007ffed3c283d0 r11 00007ffed3c28824 F DEBUG : r12 00007c88774a2f17 r13 00000000ffffffff r14 0000000000000000 r15 00007ffed3c283d0 F DEBUG : rdi 0000000000000003 rsi 00007ffed3c283bb F DEBUG : rbp 00007ffed3c28f18 rsp 00007ffed3c28288 rip 00007c890f860761 F DEBUG : F DEBUG : backtrace: F DEBUG : #00 pc 0000000000020761 /system/lib64/libc.so (strlen+17) F DEBUG : #1 pc 000000000006e761 /system/lib64/libc.so (__vfprintf+5953) F DEBUG : #2 pc 000000000008df5d /system/lib64/libc.so (vsnprintf+189) F DEBUG : #3 pc 0000000000007b60 /system/lib64/liblog.so (__android_log_vprint+64) F DEBUG : #4 pc 000000000001350c /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (log_debug_nocheck(_LogCategories, char const*, ...)+204) F DEBUG : #5 pc 000000000000de6a /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+538) F DEBUG : #6 pc 000000000000df13 /data/app/com.xamarin.DrawableTinting-zvchh4ya_DW11GfpEPFICw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) F DEBUG : #7 pc 00000000000d57f8 <anonymous:0000000042d04000> Add the missing parameter to prevent the `SIGSEGV` from happening.
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May 27, 2020
Fixes: #4713 Context: mono/mono@10795da1c065c Context: mono/mono@8c085a99b32e9 Changes: mono/mono@075c3f0...8c085a9 * mono/mono@8c085a99b32: [reflection] Check whether a pointer is valid before dereferencing (#19842) * mono/mono@89d772a3abb: Always include Unicode charinfo, so tar made in csc mode works in mcs mode (#19813) * mono/mono@e9d3af508e4: Bump bockbuild to get mono/bockbuild#159 * mono/mono@d6f0c25d34d: [2020-02] Bump msbuild to track mono-2019-12 (#19661) Whenever Xamarin.Android runtime needs to instantiate a managed type, it first looks it up by calling: MonoType *type = mono_reflection_type_from_name ("MyType, Assembly", nullptr); The `nullptr` pointer refers to an instance of the Mono `MonoImage` structure and if `nullptr`, it should cause Mono to find the correct image containing the type and load it, if not already loaded. The pointer is propagated down the call chain inside Mono and due to one of the functions called not properly validating its arguments, the `nullptr` pointer was dereferenced, leading to a crash similar to: libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4c0 in tid 11029 (ompanyname.app3), pid 11029 (ompanyname.app3) crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone /system/bin/tombstoned: received crash request for pid 11029 crash_dump64: performing dump of process 11029 (target tid = 11029) DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** DEBUG : Build fingerprint: 'google/sdk_gphone_x86_64/generic_x86_64:10/QSR1.190920.001/5891938:user/release-keys' DEBUG : Revision: '0' DEBUG : ABI: 'x86_64' DEBUG : Timestamp: 2020-05-25 14:45:29+0200 DEBUG : pid: 11029, tid: 11029, name: ompanyname.app3 >>> com.companyname.app3 <<< DEBUG : uid: 10134 DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4c0 DEBUG : Cause: null pointer dereference DEBUG : rax 000000000000002f rbx 0000000000000001 rcx 0000000000000000 rdx 0000000000000030 DEBUG : r8 0000000000000003 r9 000000000013e2e2 r10 0173eed800000000 r11 0000000000000206 DEBUG : r12 0000000000000000 r13 00007478530343c0 r14 00007478075eda33 r15 000074780763efb0 DEBUG : rdi 0000000000000000 rsi 00007478e2cb14d0 DEBUG : rbp 00007ffef3a35680 rsp 00007ffef3a355d0 rip 0000747807a4066a DEBUG : DEBUG : backtrace: DEBUG : #00 pc 00000000003ba66a /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (_mono_reflection_get_type_from_info+474) DEBUG : #1 pc 00000000003ba3d1 /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (mono_reflection_type_from_name_checked+321) DEBUG : #2 pc 00000000003ba26d /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (mono_reflection_type_from_name+125) DEBUG : #3 pc 000000000000ddb5 /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+389) (BuildId: 9952f1cfe0d910ae631abc73479f88eef34fd71d) DEBUG : #4 pc 000000000000def3 /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) (BuildId: 9952f1cfe0d910ae631abc73479f88eef34fd71d) DEBUG : #5 pc 0000000000069532 <anonymous:5ad25000> Mono commit mono/mono@10795da1c06 fixes this issue.
jonpryor
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May 28, 2020
Fixes: #4713 Context: mono/mono@10795da1c065c Context: mono/mono@8c085a99b32e9 Changes: mono/mono@075c3f0...8c085a9 * mono/mono@8c085a99b32: [reflection] Check whether a pointer is valid before dereferencing (#19842) * mono/mono@89d772a3abb: Always include Unicode charinfo, so tar made in csc mode works in mcs mode (#19813) * mono/mono@e9d3af508e4: Bump bockbuild to get mono/bockbuild#159 * mono/mono@d6f0c25d34d: [2020-02] Bump msbuild to track mono-2019-12 (#19661) Whenever Xamarin.Android runtime needs to instantiate a managed type, it first looks it up by calling: MonoType *type = mono_reflection_type_from_name ("MyType, Assembly", nullptr); The `nullptr` pointer refers to an instance of the Mono `MonoImage` structure and if `nullptr`, it should cause Mono to find the correct image containing the type and load it, if not already loaded. The pointer is propagated down the call chain inside Mono and due to one of the functions called not properly validating its arguments, the `nullptr` pointer was dereferenced, leading to a crash similar to: libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4c0 in tid 11029 (ompanyname.app3), pid 11029 (ompanyname.app3) crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone /system/bin/tombstoned: received crash request for pid 11029 crash_dump64: performing dump of process 11029 (target tid = 11029) DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** DEBUG : Build fingerprint: 'google/sdk_gphone_x86_64/generic_x86_64:10/QSR1.190920.001/5891938:user/release-keys' DEBUG : Revision: '0' DEBUG : ABI: 'x86_64' DEBUG : Timestamp: 2020-05-25 14:45:29+0200 DEBUG : pid: 11029, tid: 11029, name: ompanyname.app3 >>> com.companyname.app3 <<< DEBUG : uid: 10134 DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4c0 DEBUG : Cause: null pointer dereference DEBUG : rax 000000000000002f rbx 0000000000000001 rcx 0000000000000000 rdx 0000000000000030 DEBUG : r8 0000000000000003 r9 000000000013e2e2 r10 0173eed800000000 r11 0000000000000206 DEBUG : r12 0000000000000000 r13 00007478530343c0 r14 00007478075eda33 r15 000074780763efb0 DEBUG : rdi 0000000000000000 rsi 00007478e2cb14d0 DEBUG : rbp 00007ffef3a35680 rsp 00007ffef3a355d0 rip 0000747807a4066a DEBUG : DEBUG : backtrace: DEBUG : #00 pc 00000000003ba66a /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (_mono_reflection_get_type_from_info+474) DEBUG : #1 pc 00000000003ba3d1 /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (mono_reflection_type_from_name_checked+321) DEBUG : #2 pc 00000000003ba26d /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonosgen-2.0.so (mono_reflection_type_from_name+125) DEBUG : #3 pc 000000000000ddb5 /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(char const*)+389) (BuildId: 9952f1cfe0d910ae631abc73479f88eef34fd71d) DEBUG : #4 pc 000000000000def3 /data/app/com.companyname.app3-aQUF6Ge6_v-WaLb5i8Q7vw==/lib/x86_64/libmonodroid.so (xamarin::android::internal::EmbeddedAssemblies::typemap_java_to_managed(_MonoString*)+99) (BuildId: 9952f1cfe0d910ae631abc73479f88eef34fd71d) DEBUG : #5 pc 0000000000069532 <anonymous:5ad25000> Mono commit mono/mono@10795da1c06 fixes this issue.
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Feb 10, 2021
Changes: xamarin/NRefactory@0607a4a...495405a * xamarin/NRefactory@495405a6: Merge pull request #2 from jpobst/sdk-style * xamarin/NRefactory@e4d5997e: Update some project files to SDK-style. * xamarin/NRefactory@60ac8e99: Merge pull request #1 from xamarin/cecilPackageReference * xamarin/NRefactory@c2c07caa: Switch Cecil reference to PackageReference. We are working on using `dotnet build` to build `Xamarin.Android.sln` and `Xamarin.Android-Tests.sln`. `dotnet build` requires that all projects be SDK-style short-form projects. The `tests/MSBuildDeviceIntegration` integration tests use NRefactory as part of the debugger tests, to ensure that the debugger can attach to an app on-device. In order for `tests/MSBuildDeviceIntegration` to be buildable with `dotnet build`, NRefactory must have SDK-style `.csproj` files. Unfortunately, the [icsharpcode/NRefactory][0] repo only contains "long-form" projects, has been archived, and is now read-only. Switch to the [xamarin/NRefactory][1] repo, which is *not* archived and is maintained by the VSMac team, and bump to a commit which includes xamarin/NRefactory@e4d5997e, which migrates many of the `.csproj` files to SDK-style short-form projects. This allows us to continue our `dotnet build` explorations. [0]: https://github.com/icsharpcode/NRefactory [1]: https://github.com/xamarin/NRefactory
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…5623) Context: #5619 It appears that Xamarin.Android application uploaded to Google Play Console internal Test Track can fail the pre-launch test because the `MonodroidRuntime::get_java_class_name_for_TypeManager()` method can sometimes get a `nullptr` Java class name from JNI: Build fingerprint: 'google/blueline/blueline:9/PQ3A.190801.002/5670241:user/release-keys' Revision: 'MP1.0' ABI: 'arm64' pid: 15773, tid: 15773, name: com.Myapp >>> com.Myapp<<< signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 Cause: null pointer dereference x0 0000000000000000 x1 0000000000000000 x2 0000000000000000 x3 00000000000000e1 x4 0000000000000000 x5 0000000000000305 x6 0000000000000006 x7 0000000000000010 x8 0101010101010101 x9 4adfd1b7ed2e23e2 x10 0000000000430000 x11 000000000000000a x12 0000000000000002 x13 0000000000000001 x14 00000000000000a8 x15 000000000000000a x16 0000007f703f00f8 x17 0000007f7031f290 x18 0000000000000008 x19 0000000000000000 x20 0000007eecae0460 x21 0000000000000000 x22 0000000000000000 x23 0000000000000099 x24 0000000000000085 x25 0000007eecb30010 x26 0000000000000099 x27 0000000000000000 x28 0000007f724255e0 x29 0000007fe01ad010 sp 0000007fe01acff0 lr 0000007f7036f3b4 pc 0000007f7031f2a0 backtrace: #00 pc 000000000001e2a0 /system/lib64/libc.so (strlen+16) #1 pc 000000000006e3b0 /system/lib64/libc.so (strdup+20) #2 pc 000000000000d4e8 /data/app/com.Myapp-1lufsJe3FIZ0YHoEAB08KA==/split_config.arm64_v8a.apk (offset 0x165d000) (xamarin::android::internal::MonodroidRuntime::get_java_class_name_for_TypeManager(_jclass*)+92) #3 pc 000000000005f6d0 <anonymous:0000007ecc4ac000> This can happen if either one of the below points is true: 1. [`java.lang.Class.getName()`][0] returns `nullptr` (a nameless class? This seems unlikely.) 2. [`JNIEnv::GetStringUTFChars()`][1] returns `nullptr` (a memory allocation failure?) Of these, (2) appears to be most probable; regardless, add appropriate `nullptr` checks for each of them, failing gracefully instead of segfaulting. This is NOT a fix for the original problem as we don't know by what it is caused but, nevertheless, the `nullptr` check should be there. [0]: https://developer.android.com/reference/java/lang/Class?hl=en#getName() [1]: https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/functions.html#GetStringUTFChars
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May 28, 2021
Changes: dotnet/installer@f442964...3ebe0ca Changes: dotnet/linker@7a5c445...620b243 Changes: dotnet/runtime@6430375...5a26d12 Context: https://github.com/dotnet/sdk/blob/1f544a59270cecb2947e50a01f7056c685b4e319/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets#L389-L392 Context: #5954 (comment) Context: #5669 (comment) Updates: * Microsoft.Dotnet.Sdk.Internal: [from 6.0.100-preview.5.21266.3 to 6.0.100-preview.6.21276.2][0] * Microsoft.NET.ILLink.Tasks: [from 6.0.100-preview.5.21264.1 to 6.0.100-preview.6.21275.1][1] * Microsoft.NETCore.App.Ref: [from 6.0.0-preview.5.21265.5 to 6.0.0-preview.6.21274.1][2] Update `.apkdesc` files, as `System.Net.Quic.dll` is now included in the Xamarin.Forms sample. Fix `azure-pipelines.yaml` so that if (when) the `Mono.Android.NET_Tests` unit tests fail, the corresponding `.apk` or `.aab` file is uploaded for our later investigation; see also commit af7f7f5, which contained a "typo" such that .NET 6 packages *weren't* uploaded on unit test failure, as they used the wrong target framework identifier in the path. Finally, and most annoying of all, the `$(InvariantGlobalization)` MSBuild property should *not* default to `false` in .NET 6 projects, as was introduced in commit 9ac280c, but instead should default to *the empty string*. The problem is due to [`Microsoft.NET.Sdk.targets`][3]: <RuntimeHostConfigurationOption Condition=" '$(InvariantGlobalization)' != '' " Include="System.Globalization.Invariant" Value="$(InvariantGlobalization)" Trim="true" /> The above fragment sets `%(RuntimeHostConfigurationOption.Trim)` to `True` for `System.Globalization.Invariant` whenever `$(InvariantGlobalization)` is *not* the empty string. The value `false` is *not* the empty string. This caused `System.Globalization.Invariant`-related trim features to be enabled, which had the unfortunate and unanticipated side effect of causing ICU to *not* be properly initialized when running the `Mono.Android.NET_Tests` unit test apps, which resulted in a SIGSEGV: libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 in tid 31880 (droid.NET_Tests), pid 31880 (droid.NET_Tests) crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone tombstoned: received crash request for pid 31880 crash_dump64: performing dump of process 31880 (target tid = 31880) DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** DEBUG : Build fingerprint: 'google/redfin/redfin:11/RQ1A.201205.011/6966805:user/release-keys' DEBUG : Revision: 'MP1.0' DEBUG : ABI: 'arm64' DEBUG : Timestamp: 2021-05-26 15:21:42-0400 DEBUG : pid: 31880, tid: 31880, name: droid.NET_Tests >>> Mono.Android.NET_Tests <<< DEBUG : uid: 10282 DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 DEBUG : Cause: null pointer dereference DEBUG : x0 b400007c4de52530 x1 0000007fcc4cbeec x2 fffffffffffffff0 x3 b400007d2de37c80 DEBUG : x4 b400007d2de37cf0 x5 0000000000000004 x6 0000007c2225ddac x7 0000007fcc4cbfe0 DEBUG : x8 0000000000000000 x9 000000001333c921 x10 0000000000000000 x11 000000002de37cf0 DEBUG : x12 000000002a742e66 x13 0000000000000012 x14 0000000000000200 x15 0000000000000011 DEBUG : x16 0000007bd6adb810 x17 0000007ed2056240 x18 0000007ed3b94000 x19 0000007fcc4cc040 DEBUG : x20 b400007c4de52530 x21 b400007c4de52530 x22 0000000000000000 x23 b400007d7de490c0 DEBUG : x24 0000000000000001 x25 0000007bd58055c0 x26 0000007bd5cc0130 x27 0000007ed33ab000 DEBUG : x28 0000007bd6af1000 x29 0000007fcc4cbf00 DEBUG : lr 0000007bd69119c8 sp 0000007fcc4cbee0 pc 0000000000000000 pst 0000000080001000 … DEBUG : backtrace: DEBUG : #00 pc 0000000000000000 <unknown> DEBUG : #1 pc 000000000014e9c4 /data/app/~~oruJhhqj_EC_NWSaIGF_RQ==/Mono.Android.NET_Tests-G1iNxUwmGyu-tDRqYcK94g==/lib/arm64/libmonosgen-2.0.so (GlobalizationNative_GetSortHandle+76) (BuildId: 869ce5526fa884035199acac4ddc81bb6eeaf134) DEBUG : #2 pc 000000000000ddbc <anonymous:7c22250000> While we've (inadvertently) had `%(Trim)` enabled for over three months now, the *trigger* for this particular crash appears to be commit dotnet/runtime@bc27d49, which moved ICU initialization outside of the `GlobalizationMode` static constructor and into a new `GlobalizationMode.Settings` static constructor…which wasn't executed. Explicitly setting `$(InvariantGlobalization)` to the empty string *unless* it is the value `true` allows us to avoid setting `%(RuntimeHostConfigurationOption.Trim)`=True for `System.Globalization.Invariant`, which in turn avoids whatever set of linker-induced changes were preventing ICU from being properly initialized, which avoids the SIGSEGV. Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com> Co-authored-by: Jonathan Peppers <[email protected]> Co-authored-by: Peter Collins <[email protected]> [0]: dotnet/installer@f442964...3ebe0ca [1]: dotnet/linker@7a5c445...620b243 [2]: dotnet/runtime@6430375...5a26d12 [3]: https://github.com/dotnet/sdk/blob/1f544a59270cecb2947e50a01f7056c685b4e319/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets#L389-L392
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Context: #6420 (comment) Clang's AddressSanitizer detected the following: Mono.Android_Tests: ==2488==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x8a600774 at pc 0xaeee9982 bp 0xbf98dc68 sp 0xbf98dc60 Mono.Android_Tests: WRITE of size 4 at 0x8a600774 thread T0 Mono.Android_Tests: #0 0xaeee9981 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38981) Mono.Android_Tests: #1 0xaeef92d9 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x482d9) Mono.Android_Tests: #2 0xaef009ae (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x4f9ae) Mono.Android_Tests: #3 0xaef06d14 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x55d14) Mono.Android_Tests: 0x8a600774 is located 0 bytes to the right of 4-byte region [0x8a600770,0x8a600774) Mono.Android_Tests: allocated by thread T0 here: Mono.Android_Tests: #0 0xaedbe925 (/data/app/Mono.Android_Tests-1/lib/x86/libclang_rt.asan-i686-android.so+0xb6925) Mono.Android_Tests: #1 0xaeee9ae1 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38ae1) Mono.Android_Tests: #2 0xaeee9751 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38751) Mono.Android_Tests: #3 0xaeef92d9 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x482d9) Mono.Android_Tests: #4 0xaef009ae (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x4f9ae) Mono.Android_Tests: #5 0xaef06d14 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x55d14) Mono.Android_Tests: #6 0xb30cb970 (/data/dalvik-cache/x86/data@[email protected][email protected]@classes.dex+0x5c970) Mono.Android_Tests: SUMMARY: AddressSanitizer: heap-buffer-overflow (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38981) Address of the offending region points to `BasicUtilities::monodroid_strsplit()` and is likely the line modified in this commit. Append terminating `nullptr` to `vector` instead of overwriting the last element.
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Jan 19, 2022
Commit 6eb11f1 added support for API-32, while keeping the .NET 6 default `$(TargetFramework)` value as `net6.0-android31.0`: > However, we don't want to change the default API level for .NET 6 > projects; the default will remain `net6.0-android31.0` (API-31), This appears to have had some unforeseen complications: we would use the API-31 `Mono.Android.dll`, with the API-32 `libmonodroid.so`/etc. runtime libraries. This in turn appears to be responsible for some crashes we've seen on CI ever since commit c227042 when running the `Mono.Android.NET_Tests` unit tests under .NET 6 with the interpreter enabled, because `libxamarin-app.so` and `libmonodroid.so` have ABI dependencies: DOTNET : JNI_OnLoad: JNI_OnLoad in pal_jni.c libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x2 in tid 3666 (droid.NET_Tests), pid 3666 (droid.NET_Tests) crash_dump64: performing dump of process 3666 (target tid = 3666) DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** DEBUG : Build fingerprint: 'Android/sdk_phone_x86_64/generic_x86_64:10/QPP6.190730.005.B1/5775370:userdebug/test-keys' DEBUG : Revision: '0' DEBUG : ABI: 'x86_64' DEBUG : Timestamp: 2022-01-18 16:53:04+0000 DEBUG : pid: 3666, tid: 3666, name: droid.NET_Tests >>> Mono.Android.NET_Tests <<< DEBUG : uid: 10105 DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x2 DEBUG : Cause: null pointer dereference DEBUG : rax 0000000000002b36 rbx 000078c8afb3f860 rcx 000078c98b6561f0 rdx 0000000000000000 DEBUG : r8 0000000000000002 r9 0000000000000080 r10 000078c98b296080 r11 000078c987d35178 DEBUG : r12 00007fffe46ae99c r13 000078c8afb89ea0 r14 000078c8afb3f990 r15 000078c98b6746c0 DEBUG : rdi 000078c8afb3f860 rsi 0000000000000002 DEBUG : rbp 0000000000000001 rsp 00007fffe46ae448 rip 000078c8afb1b31c main : type=1400 audit(0.0:40): avc: granted { read } for name="u:object_r:net_dns_prop:s0" dev="tmpfs" ino=6642 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:net_dns_prop:s0 tclass=file app=Mono.Android.NET_Tests DEBUG : DEBUG : backtrace: DEBUG : #00 pc 000000000002c31c /data/app/Mono.Android.NET_Tests-fbdZV696v1UeW3jUzJg9yg==/lib/x86_64/libmonodroid.so (xamarin::android::Util::monodroid_store_package_name(char const*)+12) (BuildId: 91fe7d9c6b30356fcfb8337b8541d0132df4f44a) DEBUG : #1 pc 0000000000025bbc /data/app/Mono.Android.NET_Tests-fbdZV696v1UeW3jUzJg9yg==/lib/x86_64/libmonodroid.so (xamarin::android::internal::MonodroidRuntime::Java_mono_android_Runtime_initInternal(_JNIEnv*, _jclass*, _jstring*, _jobjectArray*, _jstring*, _jobjectArray*, _jobject*, _jobjectArray*, int, unsigned char, unsigned char)+652) (BuildId: 91fe7d9c6b30356fcfb8337b8541d0132df4f44a) DEBUG : #2 pc 00000000000273fb /data/app/Mono.Android.NET_Tests-fbdZV696v1UeW3jUzJg9yg==/lib/x86_64/libmonodroid.so (Java_mono_android_Runtime_initInternal+75) (BuildId: 91fe7d9c6b30356fcfb8337b8541d0132df4f44a) DEBUG : #3 pc 0000000000174641 /apex/com.android.runtime/lib64/libart.so (art_quick_generic_jni_trampoline+209) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2) … Thinking about it more, we should only need to use the API-31 "ref" or "targeting" pack. The "runtime" pack can just use the latest from the workload. To fix this: 1. Create new `$(_AndroidTargetingPackId)` and `$(_AndroidTargetingPackVersion)` properties to use independently of the runtime pack version. 2. Remove `Microsoft.Android.Runtime.31.[rid]` packs from the workload. 3. Remove the `android-32` workload, as it should no longer be needed. The API 31 "ref" pack is fairly small and can go in the `android` workload. Now our `android` workload is: * `Microsoft.Android.Sdk` * `Microsoft.Android.Ref.31` * `Microsoft.Android.Ref.32` * `Microsoft.Android.Runtime.32.android-arm` * `Microsoft.Android.Runtime.32.android-arm64` * `Microsoft.Android.Runtime.32.android-x86` * `Microsoft.Android.Runtime.32.android-x64` * `Microsoft.Android.Templates` After these changes, I get this assembly at build time: dotnet\packs\Microsoft.Android.Ref.31\31.0.101-preview.11.117\ref\net6.0\Mono.Android.dll And this assembly at runtime: dotnet\packs\Microsoft.Android.Runtime.32.android-arm64\31.0.200-preview.13.21\runtimes\android-arm64\lib\net6.0\Mono.Android.dll Additionally, CI is fully green; in particular, the **APKs .NET - macOS** step is green, which hasn't been true on xamarin-android/main since commit c227042.
jonpryor
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Jan 27, 2022
Context: dotnet/maui#4262 Context: #6675 If you run the `maui-blazor` template in a Release build: dotnet build -t:Run -c Release it crashes at runtime: D monodroid-assembly: typemap: type with token 33555274 (0x200034a) in module {C7B4CC8F-7A03-4A3F-A34A-DC66EDC548B9} (Mono.Android) corresponds to Java type 'android/runtime/JavaProxyThrowable' … F DEBUG : backtrace: F DEBUG : #00 pc 000000000065d8fc /apex/com.android.art/lib64/libart.so (void art::StackVisitor::WalkStack<(art::StackVisitor::CountTransitions)0>(bool)+156) (BuildId: 7fbaf2a1a3317bd634b00eb90e32291e) F DEBUG : #1 pc 000000000069b25d /apex/com.android.art/lib64/libart.so (art::Thread::GetCurrentMethod(unsigned int*, bool, bool) const+157) (BuildId: 7fbaf2a1a3317bd634b00eb90e32291e) F DEBUG : #2 pc 0000000000430fed /apex/com.android.art/lib64/libart.so (art::JNI<false>::FindClass(_JNIEnv*, char const*)+765) (BuildId: 7fbaf2a1a3317bd634b00eb90e32291e) F DEBUG : #3 pc 0000000000047e5a /data/app/~~0Qm6D1S0sO3f1lwfakN0PA==/com.companyname.mauiapp2-08UokVCH5k_PlbZEH_hhkA==/split_config.x86_64.apk!libmono-android.release.so (offset 0x11e000) (java_interop_jnienv_find_class+26) (BuildId: 3d04f8b946590175e97b89aee2e3b19ceed4b524) F DEBUG : #4 pc 00000000000128ac <anonymous:41640000> The crash can be avoided by disabling the linker: dotnet build -t:Run -c Release -p:AndroidLinkMode=None # -or- dotnet build -t:Run -c Release -p:PublishTrimmed=false However, let us return to the crash: *why* is it crashing? This isn't a "good debugging experience"; we have no useful context. Lots of investigation later -- all hail printf debugging -- and we found that the cause of the crash was an unhandled exception: 1. `Mono.Android.dll` has it's Java Callable Wrappers generated from the *unlinked* assembly, into `mono.android.jar` and `mono.android.dex` files. The Java Callable Wrapper for `Android.Runtime.InputStreamAdapter` thus includes *all* `Read()` method overloads. 2. When the app is built in Release configuration, linking is enabled, and *some* of the `InputStreamAdapter.Read()` methods are removed by the linker, along with the `Java.IO.InputStream.Read()` methods that were overridden. 3. At runtime, we perform [Java Type Registration][0] for the `Android.Runtime.InputStreamAdapter` type, which eventually calls `AndroidTypeManager.RegisterNativeMembers()`, which eventually attempts to *effectively* do: Delegate.CreateDelegate ( typeof(Func<Delegate>), typeof(InputStreamAdapter), "GetReadHandler"); 4. Because of (2), `Java.IO.InputStream.GetReadHandler()` *does not exist*, and thus `Delegate.CreateDelegate()` throws an `ArgumentException`. So far, so reasonable, but… 5. `AndroidTypeManager.RegisterNativeMembers()` didn't catch any exceptions, nor did any other method between the original Java `Runtime.register()` invocation and `AndroidTypeManager.RegisterNativeMembers()`. The result is that a C# exception was "in flight", and Mono then proceeded to *tear down the stack frame* as it unwound the callstack looking for `catch` handlers. At this point, the process is toast: the runtime stack is FUBAR. This is also why the `backtrace:` is "rooted" in `JNIEnv::FindClass()`: `JNIEnv::FindClass()` invokes Java static constructors before returning, which is how the static constructor in the Java Callable Wrapper for `InputStreamAdapter` called `Runtime.register()` in the first place. All of this makes for a miserable debugging experience. Fixing the "original" linker issue will be done in #6675. This hasn't been an issue in "Classic" Xamarin.Android, presumably because the classic linker isn't as good as the net6 linker. What we want to do *here* is improve this debugging experience, by "wrapping" `AndroidTypeManager.RegisterNativeMembers()` in a `try`/`catch` block, which can then *marshal the thrown exception* back to Java. This *prevents* Mono from unwinding the callstack past a JNI boundary, and avoids the annoying-to-debug app crash. After this change, we get a much friendlier unhandled exception crash: I MonoDroid: Android.Runtime.JavaProxyThrowable: Exception_WasThrown, Android.Runtime.JavaProxyThrowable I MonoDroid: I MonoDroid: --- End of managed Android.Runtime.JavaProxyThrowable stack trace --- I MonoDroid: android.runtime.JavaProxyThrowable: System.ArgumentException: Arg_DlgtTargMeth I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String , Boolean , Boolean ) I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String ) I MonoDroid: at Android.Runtime.AndroidTypeManager.RegisterNativeMembers(JniType , Type , String ) I MonoDroid: --- End of stack trace from previous location --- I MonoDroid: at Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference , JniMethodInfo , JniArgumentValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue[] ) I MonoDroid: at Android.Runtime.JNIEnv.FindClass(String ) I MonoDroid: at Android.Runtime.JNIEnv.AllocObject(String ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue[] ) I MonoDroid: at Android.Runtime.InputStreamAdapter..ctor(Stream ) I MonoDroid: at Android.Runtime.InputStreamAdapter.ToLocalJniHandle(Stream ) I MonoDroid: at Android.Webkit.WebResourceResponse..ctor(String , String , Int32 , String , IDictionary`2 , Stream ) I MonoDroid: at Microsoft.AspNetCore.Components.WebView.Maui.WebKitWebViewClient.ShouldInterceptRequest(WebView view, IWebResourceRequest request) I MonoDroid: at Android.Webkit.WebViewClient.n_ShouldInterceptRequest_Landroid_webkit_WebView_Landroid_webkit_WebResourceRequest_(IntPtr , IntPtr , IntPtr , IntPtr ) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.n_shouldInterceptRequest(Native Method) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.shouldInterceptRequest(WebKitWebViewClient.java:39) I MonoDroid: at Rr.a(chromium-TrichromeWebViewGoogle.apk-stable-410410686:16) I MonoDroid: at org.chromium.android_webview.AwContentsBackgroundThreadClient.shouldInterceptRequestFromNative(chromium-TrichromeWebViewGoogle.apk-stable-410410686:2) I MonoDroid: I MonoDroid: --- End of managed Android.Runtime.JavaProxyThrowable stack trace --- I MonoDroid: android.runtime.JavaProxyThrowable: System.ArgumentException: Arg_DlgtTargMeth I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String , Boolean , Boolean ) I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String ) I MonoDroid: at Android.Runtime.AndroidTypeManager.RegisterNativeMembers(JniType , Type , String ) I MonoDroid: --- End of stack trace from previous location --- I MonoDroid: at Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference , JniMethodInfo , JniArgumentValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue[] ) I MonoDroid: at Android.Runtime.JNIEnv.FindClass(String ) I MonoDroid: at Android.Runtime.JNIEnv.AllocObject(String ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue[] ) I MonoDroid: at Android.Runtime.InputStreamAdapter..ctor(Stream ) I MonoDroid: at Android.Runtime.InputStreamAdapter.ToLocalJniHandle(Stream ) I MonoDroid: at Android.Webkit.WebResourceResponse..ctor(String , String , Int32 , String , IDictionary`2 , Stream ) I MonoDroid: at Microsoft.AspNetCore.Components.WebView.Maui.WebKitWebViewClient.ShouldInterceptRequest(WebView view, IWebResourceRequest request) I MonoDroid: at Android.Webkit.WebViewClient.n_ShouldInterceptRequest_Landroid_webkit_WebView_Landroid_webkit_WebResourceRequest_(IntPtr , IntPtr , IntPtr , IntPtr ) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.n_shouldInterceptRequest(Native Method) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.shouldInterceptRequest(WebKitWebViewClient.java:39) I MonoDroid: at Rr.a(chromium-TrichromeWebViewGoogle.apk-stable-410410686:16) I MonoDroid: at org.chromium.android_webview.AwContentsBackgroundThreadClient.shouldInterceptRequestFromNative(chromium-TrichromeWebViewGoogle.apk-stable-410410686:2) This is much easier to reason about, and will save us time in the future. [0]: https://github.com/xamarin/xamarin-android/wiki/Blueprint#java-type-registration
jonathanpeppers
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Jan 27, 2022
Context: dotnet/maui#4262 Context: #6675 If you run the `maui-blazor` template in a Release build: dotnet build -t:Run -c Release it crashes at runtime: D monodroid-assembly: typemap: type with token 33555274 (0x200034a) in module {C7B4CC8F-7A03-4A3F-A34A-DC66EDC548B9} (Mono.Android) corresponds to Java type 'android/runtime/JavaProxyThrowable' … F DEBUG : backtrace: F DEBUG : #00 pc 000000000065d8fc /apex/com.android.art/lib64/libart.so (void art::StackVisitor::WalkStack<(art::StackVisitor::CountTransitions)0>(bool)+156) (BuildId: 7fbaf2a1a3317bd634b00eb90e32291e) F DEBUG : #1 pc 000000000069b25d /apex/com.android.art/lib64/libart.so (art::Thread::GetCurrentMethod(unsigned int*, bool, bool) const+157) (BuildId: 7fbaf2a1a3317bd634b00eb90e32291e) F DEBUG : #2 pc 0000000000430fed /apex/com.android.art/lib64/libart.so (art::JNI<false>::FindClass(_JNIEnv*, char const*)+765) (BuildId: 7fbaf2a1a3317bd634b00eb90e32291e) F DEBUG : #3 pc 0000000000047e5a /data/app/~~0Qm6D1S0sO3f1lwfakN0PA==/com.companyname.mauiapp2-08UokVCH5k_PlbZEH_hhkA==/split_config.x86_64.apk!libmono-android.release.so (offset 0x11e000) (java_interop_jnienv_find_class+26) (BuildId: 3d04f8b946590175e97b89aee2e3b19ceed4b524) F DEBUG : #4 pc 00000000000128ac <anonymous:41640000> The crash can be avoided by disabling the linker: dotnet build -t:Run -c Release -p:AndroidLinkMode=None # -or- dotnet build -t:Run -c Release -p:PublishTrimmed=false However, let us return to the crash: *why* is it crashing? This isn't a "good debugging experience"; we have no useful context. Lots of investigation later -- all hail printf debugging -- and we found that the cause of the crash was an unhandled exception: 1. `Mono.Android.dll` has it's Java Callable Wrappers generated from the *unlinked* assembly, into `mono.android.jar` and `mono.android.dex` files. The Java Callable Wrapper for `Android.Runtime.InputStreamAdapter` thus includes *all* `Read()` method overloads. 2. When the app is built in Release configuration, linking is enabled, and *some* of the `InputStreamAdapter.Read()` methods are removed by the linker, along with the `Java.IO.InputStream.Read()` methods that were overridden. 3. At runtime, we perform [Java Type Registration][0] for the `Android.Runtime.InputStreamAdapter` type, which eventually calls `AndroidTypeManager.RegisterNativeMembers()`, which eventually attempts to *effectively* do: Delegate.CreateDelegate ( typeof(Func<Delegate>), typeof(InputStreamAdapter), "GetReadHandler"); 4. Because of (2), `Java.IO.InputStream.GetReadHandler()` *does not exist*, and thus `Delegate.CreateDelegate()` throws an `ArgumentException`. So far, so reasonable, but… 5. `AndroidTypeManager.RegisterNativeMembers()` didn't catch any exceptions, nor did any other method between the original Java `Runtime.register()` invocation and `AndroidTypeManager.RegisterNativeMembers()`. The result is that a C# exception was "in flight", and Mono then proceeded to *tear down the stack frame* as it unwound the callstack looking for `catch` handlers. At this point, the process is toast: the runtime stack is FUBAR. This is also why the `backtrace:` is "rooted" in `JNIEnv::FindClass()`: `JNIEnv::FindClass()` invokes Java static constructors before returning, which is how the static constructor in the Java Callable Wrapper for `InputStreamAdapter` called `Runtime.register()` in the first place. All of this makes for a miserable debugging experience. Fixing the "original" linker issue will be done in #6675. This hasn't been an issue in "Classic" Xamarin.Android, presumably because the classic linker isn't as good as the net6 linker. What we want to do *here* is improve this debugging experience, by "wrapping" `AndroidTypeManager.RegisterNativeMembers()` in a `try`/`catch` block, which can then *marshal the thrown exception* back to Java. This *prevents* Mono from unwinding the callstack past a JNI boundary, and avoids the annoying-to-debug app crash. After this change, we get a much friendlier unhandled exception crash: I MonoDroid: Android.Runtime.JavaProxyThrowable: Exception_WasThrown, Android.Runtime.JavaProxyThrowable I MonoDroid: I MonoDroid: --- End of managed Android.Runtime.JavaProxyThrowable stack trace --- I MonoDroid: android.runtime.JavaProxyThrowable: System.ArgumentException: Arg_DlgtTargMeth I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String , Boolean , Boolean ) I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String ) I MonoDroid: at Android.Runtime.AndroidTypeManager.RegisterNativeMembers(JniType , Type , String ) I MonoDroid: --- End of stack trace from previous location --- I MonoDroid: at Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference , JniMethodInfo , JniArgumentValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue[] ) I MonoDroid: at Android.Runtime.JNIEnv.FindClass(String ) I MonoDroid: at Android.Runtime.JNIEnv.AllocObject(String ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue[] ) I MonoDroid: at Android.Runtime.InputStreamAdapter..ctor(Stream ) I MonoDroid: at Android.Runtime.InputStreamAdapter.ToLocalJniHandle(Stream ) I MonoDroid: at Android.Webkit.WebResourceResponse..ctor(String , String , Int32 , String , IDictionary`2 , Stream ) I MonoDroid: at Microsoft.AspNetCore.Components.WebView.Maui.WebKitWebViewClient.ShouldInterceptRequest(WebView view, IWebResourceRequest request) I MonoDroid: at Android.Webkit.WebViewClient.n_ShouldInterceptRequest_Landroid_webkit_WebView_Landroid_webkit_WebResourceRequest_(IntPtr , IntPtr , IntPtr , IntPtr ) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.n_shouldInterceptRequest(Native Method) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.shouldInterceptRequest(WebKitWebViewClient.java:39) I MonoDroid: at Rr.a(chromium-TrichromeWebViewGoogle.apk-stable-410410686:16) I MonoDroid: at org.chromium.android_webview.AwContentsBackgroundThreadClient.shouldInterceptRequestFromNative(chromium-TrichromeWebViewGoogle.apk-stable-410410686:2) I MonoDroid: I MonoDroid: --- End of managed Android.Runtime.JavaProxyThrowable stack trace --- I MonoDroid: android.runtime.JavaProxyThrowable: System.ArgumentException: Arg_DlgtTargMeth I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String , Boolean , Boolean ) I MonoDroid: at System.Delegate.CreateDelegate(Type , Type , String ) I MonoDroid: at Android.Runtime.AndroidTypeManager.RegisterNativeMembers(JniType , Type , String ) I MonoDroid: --- End of stack trace from previous location --- I MonoDroid: at Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference , JniMethodInfo , JniArgumentValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.CallStaticObjectMethod(IntPtr , IntPtr , JValue[] ) I MonoDroid: at Android.Runtime.JNIEnv.FindClass(String ) I MonoDroid: at Android.Runtime.JNIEnv.AllocObject(String ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue* ) I MonoDroid: at Android.Runtime.JNIEnv.StartCreateInstance(String , String , JValue[] ) I MonoDroid: at Android.Runtime.InputStreamAdapter..ctor(Stream ) I MonoDroid: at Android.Runtime.InputStreamAdapter.ToLocalJniHandle(Stream ) I MonoDroid: at Android.Webkit.WebResourceResponse..ctor(String , String , Int32 , String , IDictionary`2 , Stream ) I MonoDroid: at Microsoft.AspNetCore.Components.WebView.Maui.WebKitWebViewClient.ShouldInterceptRequest(WebView view, IWebResourceRequest request) I MonoDroid: at Android.Webkit.WebViewClient.n_ShouldInterceptRequest_Landroid_webkit_WebView_Landroid_webkit_WebResourceRequest_(IntPtr , IntPtr , IntPtr , IntPtr ) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.n_shouldInterceptRequest(Native Method) I MonoDroid: at crc64d693e2d9159537db.WebKitWebViewClient.shouldInterceptRequest(WebKitWebViewClient.java:39) I MonoDroid: at Rr.a(chromium-TrichromeWebViewGoogle.apk-stable-410410686:16) I MonoDroid: at org.chromium.android_webview.AwContentsBackgroundThreadClient.shouldInterceptRequestFromNative(chromium-TrichromeWebViewGoogle.apk-stable-410410686:2) This is much easier to reason about, and will save us time in the future. [0]: https://github.com/xamarin/xamarin-android/wiki/Blueprint#java-type-registration
jonpryor
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May 25, 2022
Context: dotnet/install-scripts#15 Context: https://dot.net/v1/dotnet-install.sh Context: https://dot.net/v1/dotnet-install.ps1 We've been installing dotnet versions using the [`dotnet-install`][0] scripts for Unix & Windows. However, they do not cache the downloaded archive, and therefore we end up re-downloading the same archive over and over again. Additionally, if one finds themselves without an internet connection, there's no way to easily install the required version of dotnet. The installation scripts don't provide a way to cache the payloads and they appear to be in maintenance mode (dotnet/install-scripts#15), so there doesn't appear to be a chance to add caching support to them. Fortunately, we can "ask" the scripts what they're downloading: % curl -o dotnet-install.sh 'https://dot.net/v1/dotnet-install.sh' % ./dotnet-install.sh --version 7.0.100-preview.5.22273.1 --verbose --dry-run \ | grep 'dotnet-install: URL' This returns a list of URLs, which may or may not exist: dotnet-install: URL #0 - primary: https://dotnetcli.azureedge.net/dotnet/Sdk/7.0.100-preview.5.22273.1/dotnet-sdk-7.0.100-preview.5.22273.1-osx-x64.tar.gz dotnet-install: URL #1 - legacy: https://dotnetcli.azureedge.net/dotnet/Sdk/7.0.100-preview.5.22273.1/dotnet-dev-osx-x64.7.0.100-preview.5.22273.1.tar.gz dotnet-install: URL #2 - primary: https://dotnetbuilds.azureedge.net/public/Sdk/7.0.100-preview.5.22273.1/dotnet-sdk-7.0.100-preview.5.22273.1-osx-x64.tar.gz dotnet-install: URL #3 - legacy: https://dotnetbuilds.azureedge.net/public/Sdk/7.0.100-preview.5.22273.1/dotnet-dev-osx-x64.7.0.100-preview.5.22273.1.tar.gz We now parse this output, extract the URLs, then download and cache the URL contents into `$(AndroidToolchainCacheDirectory)`. When we need to install .NET, we just extract the cached archive into the appropriate directory. If no `dotnet-install: URL…` messages are generated, then we run the `dotnet-install` script as we previously did. This process lets us take a first step towards fully "offline" builds, along with smaller downloads on CI servers. [0]: https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-install-script
jonpryor
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Jan 26, 2023
…7732) Fixes: #7335 Context: d236af5 Commit d236af5 introduced embedded assembly compression, using LZ4, which speeds up startup and reduces final package size. Assemblies are compressed at build time and, at the same time, pre- allocated buffers for the **decompressed** data are allocated in `libxamarin-app.so`. The buffers are then passed to the LZ4 APIs, all threads using the same output buffer. The assumption was that we can do fine without locking as even if overlapped decompression happens, the output data will be the same and so even if two threads do the same thing at the same time, the data will be valid at all times, so long as at least one thread completes the decompression. This assumption proved to be **largely** true, but it appears that in high concurrency cases it is possible that the data in the decompression buffer differs. This can result in app crashes: A/libc: Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 3092 (.NET ThreadPool), pid 2727 (myapp.name) A/DEBUG: pid: 2727, tid: 3092, name: .NET ThreadPool >>> myapp.name <<< A/DEBUG: #1 pc 0000000000029b1c /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmono-android.release.so (offset 0x103d000) (xamarin::android::internal::MonodroidRuntime::mono_log_handler(char const*, char const*, char const*, int, void*)+144) (BuildId: 29c5a3805a0bedee1eede9b6668d7c676aa63371) A/DEBUG: #2 pc 00000000002680bc /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) A/DEBUG: #3 pc 00000000002681e8 /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) A/DEBUG: #4 pc 000000000008555c /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (mono_metadata_string_heap+188) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) … My guess is that LZ4 either uses the output buffer as a scratchpad area when decompressing or that it initializes/modifies the buffer before writing actual data in it. With overlapped decompression, it may lead to one thread overwriting valid data previously written by another thread, so that when the latter returns the buffer it thought to have had valid data may contain certain bytes temporarily overwritten by the decompression session in the other, still running, thread. It may happen that MonoVM reads the corrupted data just when it is still invalid (before the still running decompression session actually writes the valid data), a classic race condition. To fix this, the decompression block is now protected with a startup- aware mutex. Mutex will be held only after the initial startup phase is completed, so there should not be much loss of startup performance.
jonathanpeppers
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Jan 28, 2023
Changes: dotnet/installer@9962c6a...779a644 Changes: dotnet/linker@4b3f78c...c790896 Changes: dotnet/runtime@5da4a9e...ddb6988 Changes: dotnet/emsdk@66b9845...5b46122 Updates: * Microsoft.Dotnet.Sdk.Internal: from 8.0.100-alpha.1.23063.11 to 8.0.100-alpha.1.23070.23 * Microsoft.NET.ILLink.Tasks: from 8.0.100-1.23055.2 to 8.0.100-1.23067.1 * Microsoft.NETCore.App.Ref: from 8.0.0-alpha.1.23058.2 to 8.0.0-alpha.1.23070.1 * Microsoft.NET.Workload.Emscripten.net7.Manifest-8.0.100: from 8.0.0-alpha.1.22620.1 to 8.0.0-alpha.1.23066.1 ~~ Other Changes ~~ * Update `.apkdesc` files for app size changes. * Use .jar files from the .NET runtime pack (#7665) Since [dotnet/runtime#77386][0] has been merged, .NET will require a certain class from `libSystem.Security.Cryptography.Native.Android.jar` that will be located in the runtime pack files. [0]: dotnet/runtime#77386 * Disambiguate `.jar` files from Mono runtime packs. We were getting the build error: error JAVA0000: Caused by: com.android.tools.r8.internal.f: Type net.dot.android.crypto.DotnetProxyTrustManager is defined multiple times This `.jar` file is contained in each runtime pack (4 architectures) gives us 4 `.jar` files! We can pass in these files to the `<ProcessAssemblies/>` MSBuild task. We also filter them based on `%(NuGetPackageId)`, so that any random `.jar` file doesn't get added to `@(AndroidJavaLibrary)`. I renamed the `IsFrameworkAssembly()` method to `IsFromAKnownRuntimePack()` to make this more clear in the existing code. * Update `proguard_xamarin.cfg` for .NET 8. Apps using `$(AndroidLinkTool)` of r8, now need to preserve: -keep class net.dot.android.crypto.DotnetProxyTrustManager { *; <init>(...); } Otherwise we run into a crash when this type isn't present, such as: 01-26 23:59:19.855 8684 8684 F DEBUG : #2 pc 00000000000191d6 /data/app/Mono.Android.NET_Tests-cpTzt8Q9KwgS-znzkuAdNQ==/split_config.x86_64.apk!libSystem.Security.Cryptography.Native.Android.so (offset 0xe7000) (JNI_OnLoad+31302) (BuildId: 7d9e4013a9dd99810070587ab42956703fef69f9) Co-authored-by: Jonathan Peppers <[email protected]> Co-authored-by: Šimon Rozsíval <[email protected]>
jonpryor
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Jan 28, 2023
…7732) Fixes: #7335 Context: d236af5 Commit d236af5 introduced embedded assembly compression, using LZ4, which speeds up startup and reduces final package size. Assemblies are compressed at build time and, at the same time, pre- allocated buffers for the **decompressed** data are allocated in `libxamarin-app.so`. The buffers are then passed to the LZ4 APIs, all threads using the same output buffer. The assumption was that we can do fine without locking as even if overlapped decompression happens, the output data will be the same and so even if two threads do the same thing at the same time, the data will be valid at all times, so long as at least one thread completes the decompression. This assumption proved to be **largely** true, but it appears that in high concurrency cases it is possible that the data in the decompression buffer differs. This can result in app crashes: A/libc: Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 3092 (.NET ThreadPool), pid 2727 (myapp.name) A/DEBUG: pid: 2727, tid: 3092, name: .NET ThreadPool >>> myapp.name <<< A/DEBUG: #1 pc 0000000000029b1c /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmono-android.release.so (offset 0x103d000) (xamarin::android::internal::MonodroidRuntime::mono_log_handler(char const*, char const*, char const*, int, void*)+144) (BuildId: 29c5a3805a0bedee1eede9b6668d7c676aa63371) A/DEBUG: #2 pc 00000000002680bc /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) A/DEBUG: #3 pc 00000000002681e8 /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) A/DEBUG: #4 pc 000000000008555c /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (mono_metadata_string_heap+188) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) … My guess is that LZ4 either uses the output buffer as a scratchpad area when decompressing or that it initializes/modifies the buffer before writing actual data in it. With overlapped decompression, it may lead to one thread overwriting valid data previously written by another thread, so that when the latter returns the buffer it thought to have had valid data may contain certain bytes temporarily overwritten by the decompression session in the other, still running, thread. It may happen that MonoVM reads the corrupted data just when it is still invalid (before the still running decompression session actually writes the valid data), a classic race condition. To fix this, the decompression block is now protected with a startup- aware mutex. Mutex will be held only after the initial startup phase is completed, so there should not be much loss of startup performance.
jonpryor
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Feb 27, 2023
…7817) Fixes: #7335 Context: d236af5 Commit d236af5 introduced embedded assembly compression, using LZ4, which speeds up startup and reduces final package size. Assemblies are compressed at build time and, at the same time, pre- allocated buffers for the **decompressed** data are allocated in `libxamarin-app.so`. The buffers are then passed to the LZ4 APIs, all threads using the same output buffer. The assumption was that we can do fine without locking as even if overlapped decompression happens, the output data will be the same and so even if two threads do the same thing at the same time, the data will be valid at all times, so long as at least one thread completes the decompression. This assumption proved to be **largely** true, but it appears that in high concurrency cases it is possible that the data in the decompression buffer differs. This can result in app crashes: A/libc: Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 3092 (.NET ThreadPool), pid 2727 (myapp.name) A/DEBUG: pid: 2727, tid: 3092, name: .NET ThreadPool >>> myapp.name <<< A/DEBUG: #1 pc 0000000000029b1c /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmono-android.release.so (offset 0x103d000) (xamarin::android::internal::MonodroidRuntime::mono_log_handler(char const*, char const*, char const*, int, void*)+144) (BuildId: 29c5a3805a0bedee1eede9b6668d7c676aa63371) A/DEBUG: #2 pc 00000000002680bc /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) A/DEBUG: #3 pc 00000000002681e8 /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) A/DEBUG: #4 pc 000000000008555c /data/app/myapp.name-B9t_3dF9i8mDxJEKodZw5w==/split_config.arm64_v8a.apk!libmonosgen-2.0.so (offset 0x109b000) (mono_metadata_string_heap+188) (BuildId: 4a5dd4396e8816b7f69881838bd549285213d53b) … My guess is that LZ4 either uses the output buffer as a scratchpad area when decompressing or that it initializes/modifies the buffer before writing actual data in it. With overlapped decompression, it may lead to one thread overwriting valid data previously written by another thread, so that when the latter returns the buffer it thought to have had valid data may contain certain bytes temporarily overwritten by the decompression session in the other, still running, thread. It may happen that MonoVM reads the corrupted data just when it is still invalid (before the still running decompression session actually writes the valid data), a classic race condition. To fix this, the decompression block is now protected with a startup- aware mutex. Mutex will be held only after the initial startup phase is completed, so there should not be much loss of startup performance.
jonpryor
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Jul 13, 2023
Context: 929e701 Context: ce2bc68 Context: #7473 Context: #8155 The managed linker can produce assemblies optimized for the target `$(RuntimeIdentifier)` (RID), which means that they will differ between different RIDs. Our "favorite" example of this is `IntPtr.Size`, which is inlined by the linker into `4` or `8` when targeting 32-bit or 64-bit platforms. (See also #7473 and 929e701.) Another platform difference may come in the shape of CPU intrinsics which will change the JIT-generated native code in ways that will crash the application if the assembler instructions generated for the intrinsics aren't supported by the underlying processor. In addition, the per-RID assemblies will have different [MVID][0]s and **may** have different type and method metadata token IDs, which is important because typemaps *use* type and metadata token IDs; see also ce2bc68. All of this taken together invalidates our previous assumption that all the managed assemblies are identical. "Simply" using `IntPtr.Size` in an assembly that contains `Java.Lang.Object` subclasses will break things. This in turn could cause "mysterious" behavior or crashes in Release applications; see also Issue #8155. Prevent the potential problems by processing each per-RID assembly separately and output correct per-RID LLVM IR assembly using the appropriate per-RID information. Additionally, during testing I found that for our use of Cecil within `<GenerateJavaStubs/>` doesn't consistently remove the fields, delegates, and methods we remove in `MarshalMethodsAssemblyRewriter` when marshal methods are enabled, or it generates subtly broken assemblies which cause **some** applications to segfault at run time like so: I monodroid-gc: 1 outstanding GREFs. Performing a full GC! F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x8 in tid 12379 (t6.helloandroid), pid 12379 (t6.helloandroid) F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** F DEBUG : Build fingerprint: 'google/raven_beta/raven:14/UPB3.230519.014/10284690:user/release-keys' F DEBUG : Revision: 'MP1.0' F DEBUG : ABI: 'arm64' F DEBUG : Timestamp: 2023-07-04 22:09:58.762982002+0200 F DEBUG : Process uptime: 1s F DEBUG : Cmdline: com.microsoft.net6.helloandroid F DEBUG : pid: 12379, tid: 12379, name: t6.helloandroid >>> com.microsoft.net6.helloandroid <<< F DEBUG : uid: 10288 F DEBUG : tagged_addr_ctrl: 0000000000000001 (PR_TAGGED_ADDR_ENABLE) F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0000000000000008 F DEBUG : Cause: null pointer dereference F DEBUG : x0 0000000000000000 x1 0000007ba1401af0 x2 00000000000000fa x3 0000000000000001 F DEBUG : x4 0000007ba1401b38 x5 0000007b9f2a8360 x6 0000000000000000 x7 0000000000000000 F DEBUG : x8 ffffffffffc00000 x9 0000007b9f800000 x10 0000000000000000 x11 0000007ba1400000 F DEBUG : x12 0000000000000000 x13 0000007ba374ad58 x14 0000000000000000 x15 00000013ead77d66 F DEBUG : x16 0000007ba372f210 x17 0000007ebdaa4a80 x18 0000007edf612000 x19 000000000000001f F DEBUG : x20 0000000000000000 x21 0000007b9f2a8320 x22 0000007b9fb02000 x23 0000000000000018 F DEBUG : x24 0000007ba374ad08 x25 0000000000000004 x26 0000007b9f2a4618 x27 0000000000000000 F DEBUG : x28 ffffffffffffffff x29 0000007fc592a780 F DEBUG : lr 0000007ba3701f44 sp 0000007fc592a730 pc 0000007ba3701e0c pst 0000000080001000 F DEBUG : 8 total frames F DEBUG : backtrace: F DEBUG : #00 pc 00000000002d4e0c /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #1 pc 00000000002c29e8 /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #2 pc 00000000002c34bc /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #3 pc 00000000002c2254 /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #4 pc 00000000002be0bc /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #5 pc 00000000002bf050 /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #6 pc 00000000002a53a4 /data/app/~~Av24J15xbf20XdrY3X2_wA==/com.microsoft.net6.helloandroid-4DusuNWIAkz1Ssi7fWVF-g==/lib/arm64/libmonosgen-2.0.so (mono_gc_collect+44) (BuildId: 761134f2369377582cc3a8e25ecccb43a2e0a877) F DEBUG : #7 pc 000000000000513c <anonymous:7ec716b000> This is because we generate Java Callable Wrappers over a set of original (linked or not) assemblies, then we scan them for classes derived from `Java.Lang.Object` and use that set as input to the marshal methods rewriter, which makes the changes (generates wrapper methods, decorates wrapped methods with `[UnmanagedCallersOnly]`, removes the old delegate methods as well as delegate backing fields) to all the `Java.Lang.Object` subclasses, then writes the modified assembly to a `new/<assembly.dll>` location (efa14e2), followed by copying the newly written assemblies back to the original location. At this point, we have the results returned by the subclass scanner in memory and **new** versions of those types on disk, but they are out of sync, since the types in memory refer to the **old** assemblies, but AOT is ran on the **new** assemblies which have a different layout, changed MVIDs and, potentially, different type and method token IDs (because we added some methods, removed others etc) and thus it causes the crashes at the run time. The now invalid set of "old" types is passed to the typemap generator. This only worked by accident, because we (incorrectly) used only the first linked assembly which happened to be the same one passed to the JLO scanner and AOT - so everything was fine at the execution time. Address this by *disabling* LLVM Marshal Methods (8bc7a3e) for .NET 8, setting `$(AndroidEnableMarshalMethods)`=False by default. We'll attempt to fix these issues for .NET 9. [0]: https://learn.microsoft.com/dotnet/api/system.reflection.module.moduleversionid?view=net-7.0
jonpryor
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Jan 26, 2024
Context: dotnet/java-interop@6b3637d The story so far is that some of our unit tests are crashing, and have been in one form or another since 4332ea0 (the bump to dotnet/java-interop@def5bc0). The current crash, from the PR build for 7b46391: D monodroid-assembly: typemap: assembly 'Java.Interop-Tests' hasn't been loaded yet, attempting a full load W monodroid-assembly: typemap: failed to load managed assembly 'Java.Interop-Tests.dll'. No such file or directory E monodroid-assembly: typemap: unable to load assembly 'Java.Interop-Tests' when looking up managed type corresponding to Java type 'java/lang/Object' I monodroid-timing: [1/5] Typemap.java_to_managed: end, total time; elapsed: 0:0::260000 W monodroid-assembly: typemap: called from W monodroid-assembly: at Java.Interop.TypeManager.GetJavaToManagedType(String ) W monodroid-assembly: at Java.Interop.TypeManager.CreateInstance(IntPtr , JniHandleOwnership , Type ) W monodroid-assembly: at Java.Lang.Object.GetObject(IntPtr , JniHandleOwnership , Type ) W monodroid-assembly: at Java.Lang.Object._GetObject[IIterator](IntPtr , JniHandleOwnership ) W monodroid-assembly: at Java.Lang.Object.GetObject[IIterator](IntPtr handle, JniHandleOwnership transfer) W monodroid-assembly: at Android.Runtime.JavaSet.Iterator() W monodroid-assembly: at Android.Runtime.JavaSet`1[[System.String, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetEnumerator() W monodroid-assembly: at Xamarin.Android.UnitTests.TestInstrumentation`1[[Xamarin.Android.UnitTests.NUnit.NUnitTestRunner, TestRunner.NUnit.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ProcessArguments() W monodroid-assembly: at Xamarin.Android.UnitTests.TestInstrumentation`1[[Xamarin.Android.UnitTests.NUnit.NUnitTestRunner, TestRunner.NUnit.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].OnCreate(Bundle arguments) W monodroid-assembly: at Android.App.Instrumentation.n_OnCreate_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_arguments) W monodroid-assembly: at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(_JniMarshal_PPL_V callback, IntPtr jnienv, IntPtr klazz, IntPtr p0) E droid.NET_Test: JNI ERROR (app bug): accessed stale Local 0x75 (index 7 in a table of size 7) F droid.NET_Test: java_vm_ext.cc:570] JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x75 There are *three* "concerning" items here: 1. typemaps are trying to load `Java.Interop-Tests`, and failing: typemap: failed to load managed assembly 'Java.Interop-Tests.dll'. No such file or directory @grendello is looking into this. 2. The binding for `java/lang/Object` is coming from Java.Interop-Tests, not Mono.Android (?!) typemap: unable to load assembly 'Java.Interop-Tests' when looking up managed type corresponding to Java type 'java/lang/Object' dotnet/java-interop#1181 has a fix for this, and we're not applying the fix yet because we believe that it will hide (1). 3. The JNI error, which crashes the process: F droid.NET_Test: java_vm_ext.cc:570] JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x75 F droid.NET_Test: java_vm_ext.cc:570] from void crc643df67da7b13bb6b1.TestInstrumentation_1.n_onCreate(android.os.Bundle) F droid.NET_Test: runtime.cc:630] Runtime aborting... F droid.NET_Test: runtime.cc:630] Dumping all threads without mutator lock held F droid.NET_Test: runtime.cc:630] All threads: F droid.NET_Test: runtime.cc:630] DALVIK THREADS (14): F droid.NET_Test: runtime.cc:630] "main" prio=5 tid=1 Runnable F droid.NET_Test: runtime.cc:630] | group="" sCount=0 dsCount=0 flags=0 obj=0x729e9d98 self=0x7567e0f51000 F droid.NET_Test: runtime.cc:630] | sysTid=9143 nice=0 cgrp=default sched=0/0 handle=0x7567e14daed8 F droid.NET_Test: runtime.cc:630] | state=R schedstat=( 1270418000 334229000 139 ) utm=16 stm=110 core=0 HZ=100 F droid.NET_Test: runtime.cc:630] | stack=0x7ffcbb3e4000-0x7ffcbb3e6000 stackSize=8192KB F droid.NET_Test: runtime.cc:630] | held mutexes= "abort lock" "mutator lock"(shared held) F droid.NET_Test: runtime.cc:630] native: #00 pc 000000000048df4e /apex/com.android.runtime/lib64/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, int, BacktraceMap*, char const*, art::ArtMethod*, void*, bool)+126) F droid.NET_Test: runtime.cc:630] native: #1 pc 00000000005a77c3 /apex/com.android.runtime/lib64/libart.so (art::Thread::DumpStack(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, bool, BacktraceMap*, bool) const+675) F droid.NET_Test: runtime.cc:630] native: #2 pc 00000000005c49cb /apex/com.android.runtime/lib64/libart.so (art::DumpCheckpoint::Run(art::Thread*)+859) F droid.NET_Test: runtime.cc:630] native: #3 pc 00000000005bcf28 /apex/com.android.runtime/lib64/libart.so (art::ThreadList::RunCheckpoint(art::Closure*, art::Closure*)+456) F droid.NET_Test: runtime.cc:630] native: #4 pc 00000000005bc2e1 /apex/com.android.runtime/lib64/libart.so (art::ThreadList::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, bool)+1601) F droid.NET_Test: runtime.cc:630] native: #5 pc 0000000000552eb9 /apex/com.android.runtime/lib64/libart.so (art::Runtime::Abort(char const*)+1529) F droid.NET_Test: runtime.cc:630] native: #6 pc 000000000000c873 /system/lib64/libbase.so (android::base::LogMessage::~LogMessage()+611) F droid.NET_Test: runtime.cc:630] native: #7 pc 00000000003ede84 /apex/com.android.runtime/lib64/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+1604) F droid.NET_Test: runtime.cc:630] native: #8 pc 00000000003ee18a /apex/com.android.runtime/lib64/libart.so (art::JavaVMExt::JniAbortF(char const*, char const*, ...)+234) F droid.NET_Test: runtime.cc:630] native: #9 pc 00000000005adf31 /apex/com.android.runtime/lib64/libart.so (art::Thread::DecodeJObject(_jobject*) const+785) F droid.NET_Test: runtime.cc:630] native: #10 pc 00000000003def9b /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckInstance(art::ScopedObjectAccess&, art::(anonymous namespace)::ScopedCheck::InstanceKind, _jobject*, bool)+91) F droid.NET_Test: runtime.cc:630] native: #11 pc 00000000003de205 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckPossibleHeapValue(art::ScopedObjectAccess&, char, art::(anonymous namespace)::JniValueType)+485) F droid.NET_Test: runtime.cc:630] native: #12 pc 00000000003dd732 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::(anonymous namespace)::JniValueType*)+690) F droid.NET_Test: runtime.cc:630] native: #13 pc 00000000003ce865 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::CheckJNI::GetObjectClass(_JNIEnv*, _jobject*)+837) F droid.NET_Test: runtime.cc:630] native: #14 pc 0000000000017196 /data/app/Mono.Android.NET_Tests-LUUW792fOvX745oAS4jeRQ==/split_config.x86_64.apk (offset 331000) (???) F droid.NET_Test: runtime.cc:630] at crc643df67da7b13bb6b1.TestInstrumentation_1.n_onCreate(Native method) As per `native #13`, we're (somehow) passing an invalid JNI reference to `JNIEnv::GetObjectClass()`. ***HOW*** are we passing an invalid JNI reference to `JNIEnv::GetObjectClass()`? Attempt to investigate (3) further, by: 1. Reviewing all calls to `JNIEnv::GetObjectClass()` within this repo to see if we could potentially be passing an invalid value. The "most obvious" candidate is `TypeManager.CreateInstance()`, which calls `JNIEnv::GetObjectClass()` in a loop. I'm still not sure if that could possibly be the cause, but Just In Case™… "Cleanup" some C++ code so that calls to `JNIEnv::DeleteLocalReference()` are closer to the `JNIEnv::GetObjectClass()` calls. 2. Update `tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj` to add an `@(AndroidEnvironment)` item, which sets `debug.mono.log=gref+,lref+`. This will enable LREF and GREF logging within `adb logcat`, which *may* allow us to track down where "local reference 0x75" came from.
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condition by metadata didn't work with the complicated expression.
So, split filtering and transformation into different tasks.
specify dummy HostOS metadata (which is ugly but not too annoying).
(Linux build verification is still ongoing, not assuring that this fixes
all the possible existing issues.)