EXC_BAD_ACCESS (code=1, address=0x4) in AuthBackendRPCImplementation.callInternal(with:)

[peterfriese]

Description

When refreshing the access token, the app crashes.

Reproducing the issue

This happens shortly after launching the app and the access token is expired.
On Xcode 16.0 beta 4, this doesn't happen.

I also made tried to use the head of the main branch, to make sure I benefit from #13472 - but this didn't seem to have any positive impact.

Firebase SDK Version

11.0.0

Xcode Version

16.0 beta 5

Installation Method

Swift Package Manager

Firebase Product(s)

Authentication

Targeted Platforms

iOS

Relevant Log Output

Using the emulator: NO
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
I0000 00:00:1723453304.319128 7924252 config.cc:230] gRPC experiments enabled: call_status_override_on_cancellation, http2_stats_fix, monitoring_experiment, pick_first_new, trace_record_callops, work_serializer_clears_time_cache

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[ncooke3]

I have been unable to reproduce it, but I am finding recent concurrency related crashes with the same EXC_BAD_ACCESS (code=1, address=0x4) message.

It may be a Xcode 16b5 regression:

• swift/issues/75771
• swift-nio/issues/2834

[peterfriese]

Sounds reasonable.

Should we keep an eye on it and review once Xcode 16b6 rolls out?

[ncooke3]

@peterfriese, I think so. I'm not sure why I couldn't reproduce it though. I was using Xcode 16b5 on a physical device running iOS 17.X (I also tried the simulator). If you're able to reliably reproduce it, could you please check the other threads to see if that same class is being called elsewhere? If it's not a Xcode bug, then it may be a concurrency bug within the SDK.

[paulb777]

I'm reproing this with Xcode 16.1b1 with this backtrace when relogging in via GoogleSignIn:

[paulb777]

I have a prototype fix working - converting some internal methods to async and doing fetchAccessToken on the main actor. Still several cascading code and unit test changes to work through. ca78a65

[nataliakozlovska]

Hey! The same issue, using Xcode 16.0 beta 6 and Firebase 11.1.0. Should it be fixed in this version?

@paulb777

[ondrejkorol]

Just got the same crash reported in prod, seems it's after I've updated Firebase to v11.2 ad GoogleSignIn 8.0.0.
(I'm using Xcode 15.4)

Crashed: com.apple.root.user-initiated-qos.cooperative
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000003
AuthBackend.swift - Line 143
specialized AuthBackendRPCImplementation.callInternal(with:) + 143

[ncooke3]

Hi @nataliakozlovska, no, the fix was released in Firebase 11.2.0.

---

Thanks for reporting, @ondrejkorol. Are you able to provide a full stack trace?

[ondrejkorol]

Hi @ncooke3 , thanks for your quick response! I'll be happy to help, Crashlytics reports this:

Crashed: com.apple.root.user-initiated-qos.cooperative
0  libswiftCore.dylib             0x40437c swift_unknownObjectRetain + 8
1  Mind                           0x3297bc specialized AuthBackendRPCImplementation.callInternal<A>(with:) + 143 (AuthBackend.swift:143)
2  libswift_Concurrency.dylib     0x4d764 swift::runJobInEstablishedExecutorContext(swift::Job*) + 436
3  libswift_Concurrency.dylib     0x4e9c8 swift_job_runImpl(swift::Job*, swift::ExecutorRef) + 72
4  libdispatch.dylib              0x15894 _dispatch_root_queue_drain + 392
5  libdispatch.dylib              0x1609c _dispatch_worker_thread2 + 156
6  libsystem_pthread.dylib        0x48f8 _pthread_wqthread + 228
7  libsystem_pthread.dylib        0x10cc start_wqthread + 8

Full stack trace:
app_issue_466ae93783cfc5e3010951fc92f6e334_crash_session_c89332271f904df98a543d8daf437162_DNE_0_v2_stacktrace.txt

Data:
Device
Model:iPhone 13
Orientation:Face Up
RAM free: 64.59 MB
Operating System
Version:17.6.1
Orientation:Unknown
Jailbroken: No
Crash
Date:Sep 15, 2024, 3:29:34 AM

[ncooke3]

Thanks @ondrejkorol! I was not able to reproduce via Xcode 15.2 (simulator/device) and Xcode 16.0 RC (simulator). I will look into if Xcode 15.4 makes a difference.

From the stack trace, this looks like a slightly different issue from the original issue in this thread, especially as you are using 11.2. Could you please open a new issue using some of the info you have already provided here? Could you also please include whether you can repro this locally? https://github.com/firebase/firebase-ios-sdk/issues/new?assignees=&labels=&projects=&template=BUG_REPORT.yml

[ondrejkorol]

Thank you so much! I haven't encountered this issue locally. Just got 2 reports via Crashlytics from our users.
Do you think using Xcode 16.0 RC to publish and release the app could mitigate the issue?

I will open the new issue with the current stack trace.

[ncooke3]

If possible, could you also share the second crash report in that new issue? I'm wondering if the threading layout matches the first report.

Do you think using Xcode 16.0 RC to publish and release the app could mitigate the issue?

Possibly, but I'm not sure so I can't give a strong recommendation. Did you previously release your app with Firebase 11.1.0? If so and it was successful, downgrading could be an option. This could also indicate that the Xcode 16 fix in 11.2 may have introduced a behavior change for apps built with Xcode 15.

[ondrejkorol]

I appreciate your help! Thanks.
I've been using v+10 of Firebase. I did upgrade Firebase directly to 11.2 few days ago. And the new app versions are reporting this crash.

Here's the second stack trace I got today:
second.crash_issue_466ae93783cfc5e3010951fc92f6e334_crash_session_449ef354ab5e4450b4e53a2fde399be3_DNE_0_v2_stacktrace.txt
Device
Model:iPhone 11
Orientation:Landscape
RAM free: 112.97 MB
Operating System
Version:17.6.1
Orientation:Unknown
Jailbroken: No
Crash
Date:Sep 16, 2024, 2:17:35 AM
App version:1.0.10 (7)