misc/cgo/testsanitizers: ThreadSantitizer test fails

[nadiasvertex]

1. What version of Go are you using (go version)?

go version devel +a145378 Mon Mar 21 20:24:06 2016 +0000 linux/amd64

1. What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH=""
GORACE=""
GOROOT="/home/christopher/workspace/go-official"
GOTOOLDIR="/home/christopher/workspace/go-official/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build420019199=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"

1. What did you do?

Executed src/all.bash

1. What did you expect to see?

All tests passed.

1. What did you see instead?

##### ../misc/cgo/testsanitizers
skipping msan tests: -fsanitize=memory not supported
==================
WARNING: ThreadSanitizer: data race (pid=14437)
  Write of size 4 at 0x0000006b2e78 by thread T2:
    #0 setVal /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan.go:22 (tsan+0x000000445070)
    #1 _cgo_82605fb7dc7c_Cfunc_setVal /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan.go:96 (tsan+0x0000004450f1)
    #2 runtime.asmcgocall <null> (tsan+0x00000044235f)

  Previous write of size 4 at 0x0000006b2e78 by main thread:
    #0 setVal /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan.go:22 (tsan+0x000000445070)
    #1 _cgo_82605fb7dc7c_Cfunc_setVal /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan.go:96 (tsan+0x0000004450f1)
    #2 runtime.asmcgocall <null> (tsan+0x00000044235f)

  Location is global 'val' of size 4 at 0x0000006b2e78 (tsan+0x0000006b2e78)

  Thread T2 (tid=14440, running) created by main thread at:
    #0 pthread_create <null> (libtsan.so.0+0x000000027537)
    #1 _cgo_sys_thread_start /home/christopher/workspace/go-official/src/runtime/cgo/gcc_linux_amd64.c:73 (tsan+0x000000445471)

SUMMARY: ThreadSanitizer: data race /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan.go:22 setVal
==================
FAIL: tsan
==================
WARNING: ThreadSanitizer: data race (pid=14631)
  Write of size 4 at 0x0000006b3dd8 by thread T3:
    #0 setVal /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan2.go:32 (tsan2+0x000000445150)
    #1 _cgo_b3c556dc7343_Cfunc_setVal /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan2.go:106 (tsan2+0x0000004452e1)
    #2 runtime.asmcgocall <null> (tsan2+0x00000044246f)

  Previous write of size 4 at 0x0000006b3dd8 by main thread:
    #0 run /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan2.go:24 (tsan2+0x0000004451d9)
    #1 _cgo_b3c556dc7343_Cfunc_run /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan2.go:92 (tsan2+0x00000044528d)
    #2 runtime.asmcgocall <null> (tsan2+0x00000044246f)

  Location is global '<null>' of size 0 at 0x000000000000 (tsan2+0x0000006b3dd8)

  Thread T3 (tid=14650, running) created by main thread at:
    #0 pthread_create <null> (libtsan.so.0+0x000000027537)
    #1 _cgo_sys_thread_start /home/christopher/workspace/go-official/src/runtime/cgo/gcc_linux_amd64.c:73 (tsan2+0x000000445661)

SUMMARY: ThreadSanitizer: data race /home/christopher/workspace/go-official/misc/cgo/testsanitizers/tsan2.go:32 setVal
==================
FAIL: tsan2
2016/03/21 18:56:53 Failed: exit status 1

[ianlancetaylor]

Same as #14602?

[nadiasvertex]

Yup sorry.