Chrome Version: 35503439a8693b3e945122f8f383e188638f13f0
OS: macOS 10.13

What steps will reproduce the problem?
(1) Run browser_tests on 10.13
(2) See crashes in linbunwind

[ RUN      ] PredictorBrowserTest.SingleLookupTest
[48184:3843:0724/143105.348247:WARNING:notification_platform_bridge_mac.mm(514)] AlertNotificationService: XPC connection invalidated.
BrowserTestBase received signal: Segmentation fault: 11. Backtrace:
0   browser_tests                       0x000000010c98b48c base::debug::StackTrace::StackTrace(unsigned long) + 28
1   browser_tests                       0x000000010d0a0698 content::(anonymous namespace)::DumpStackTraceSignalHandler(int) + 200
2   libsystem_platform.dylib            0x00007fffa5583f5a _sigtramp + 26
3   ???                                 0x0000000000000000 0x0 + 0
4   libunwind.dylib                     0x00007fffa55bb1a2 libunwind::DwarfInstructions<libunwind::LocalAddressSpace, libunwind::Registers_x86_64>::stepWithDwarf(libunwind::LocalAddressSpace&, unsigned long long, unsigned long long, libunwind::Registers_x86_64&) + 328
5   libunwind.dylib                     0x00007fffa55ba222 libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86_64>::step() + 82
6   browser_tests                       0x000000010c9d7232 _ZN4base12_GLOBAL__N_120WalkStackFromContextIZNS0_21NativeStackSamplerMac27SuspendThreadAndRecordStackEPNS_18NativeStackSampler11StackBufferEPNS_21StackSamplingProfiler6SampleEE3$_1EEbP13unw_context_tmPmRKT_ + 1250
7   browser_tests                       0x000000010c9d6c7c base::(anonymous namespace)::NativeStackSamplerMac::RecordStackSample(base::NativeStackSampler::StackBuffer*, base::StackSamplingProfiler::Sample*) + 1228
8   browser_tests                       0x000000010c9d8a43 base::StackSamplingProfiler::SamplingThread::RecordSample(base::StackSamplingProfiler::SamplingThread::CollectionContext*) + 803
9   browser_tests                       0x000000010c9d8c7b base::StackSamplingProfiler::SamplingThread::PerformCollectionTask(int) + 123
10  browser_tests                       0x000000010c98bc82 base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) + 242
11  browser_tests                       0x000000010c9b32d0 base::MessageLoop::RunTask(base::PendingTask*) + 1120
12  browser_tests                       0x000000010c9b3915 base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) + 213
13  browser_tests                       0x000000010c9b3e12 base::MessageLoop::DoDelayedWork(base::TimeTicks*) + 354
14  browser_tests                       0x000000010c9b6d13 base::MessagePumpCFRunLoopBase::RunWork() + 67
15  browser_tests                       0x000000010c9a649a base::mac::CallWithEHFrame(void () block_pointer) + 10
16  browser_tests                       0x000000010c9b661f base::MessagePumpCFRunLoopBase::RunWorkSource(void*) + 63
17  CoreFoundation                      0x00007fff7e05cff1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
18  CoreFoundation                      0x00007fff7e03fc3f __CFRunLoopDoSources0 + 271
19  CoreFoundation                      0x00007fff7e03f1ef __CFRunLoopRun + 1039
20  CoreFoundation                      0x00007fff7e03eb69 CFRunLoopRunSpecific + 409
21  browser_tests                       0x000000010c9b706f base::MessagePumpCFRunLoop::DoRun(base::MessagePump::Delegate*) + 79
22  browser_tests                       0x000000010c9b5f2c base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 92
23  browser_tests                       0x000000010c9da603 base::RunLoop::Run() + 51
24  browser_tests                       0x000000010ca0c039 base::Thread::ThreadMain() + 393
25  browser_tests                       0x000000010ca05ff7 base::(anonymous namespace)::ThreadFunc(void*) + 87
26  libsystem_pthread.dylib             0x00007fffa558d87a _pthread_body + 286
27  libsystem_pthread.dylib             0x00007fffa558d75c _pthread_body + 0
28  libsystem_pthread.dylib             0x00007fffa558ce59 thread_start + 13

Slightly different stacktrace:

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x00007fffa55eb000

VM Regions Near 0x7fffa55eb000:
    __TEXT                 00007fffa55bf000-00007fffa55eb000 [  176K] r-x/r-x SM=COW  /usr/lib/system/libxpc.dylib
--> 
    unused shlib __DATA    00007fffa57eb000-00007fffa6932000 [ 17.3M] rw-/rw- SM=COW  system shared lib __DATA not used by this process


Thread 5 Crashed:: StackSamplingProfiler
0   libunwind.dylib                     0x00007fffa55bd94c libunwind::CFI_Parser<libunwind::LocalAddressSpace>::findFDE(libunwind::LocalAddressSpace&, unsigned long long, unsigned long long, unsigned int, unsi
gned long long, libunwind::CFI_Parser<libunwind::LocalAddressSpace>::FDE_Info*, libunwind::CFI_Parser<libunwind::LocalAddressSpace>::CIE_Info*) + 70
1   libunwind.dylib                     0x00007fffa55bd768 libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86_64>::getInfoFromDwarfSection(unsigned long long, unsigned long long, un
signed long long, unsigned int, unsigned int) + 86
2   libunwind.dylib                     0x00007fffa55b9be2 libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86_64>::setInfoBasedOnIPRegister(bool) + 172
3   libunwind.dylib                     0x00007fffa55b9b2b unw_init_local + 104
4   browser_tests                       0x000000010c8dfd8a bool base::(anonymous namespace)::WalkStackFromContext<base::(anonymous namespace)::NativeStackSamplerMac::SuspendThreadAndRecordStack(base::NativeSta
ckSampler::StackBuffer*, base::StackSamplingProfiler::Sample*)::$_1>(unw_context_t*, unsigned long, unsigned long*, base::(anonymous namespace)::NativeStackSamplerMac::SuspendThreadAndRecordStack(base::NativeS
tackSampler::StackBuffer*, base::StackSamplingProfiler::Sample*)::$_1 const&) + 58
5   browser_tests                       0x000000010c8dfc7c base::(anonymous namespace)::NativeStackSamplerMac::RecordStackSample(base::NativeStackSampler::StackBuffer*, base::StackSamplingProfiler::Sample*) + 
1228
6   browser_tests                       0x000000010c8e1a43 base::StackSamplingProfiler::SamplingThread::RecordSample(base::StackSamplingProfiler::SamplingThread::CollectionContext*) + 803
7   browser_tests                       0x000000010c8e1c7b base::StackSamplingProfiler::SamplingThread::PerformCollectionTask(int) + 123
8   browser_tests                       0x000000010c894c82 base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) + 242
9   browser_tests                       0x000000010c8bc2d0 base::MessageLoop::RunTask(base::PendingTask*) + 1120
10  browser_tests                       0x000000010c8bc915 base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) + 213
11  browser_tests                       0x000000010c8bcbe9 base::MessageLoop::DoWork() + 425
12  browser_tests                       0x000000010c8bfcfa base::MessagePumpCFRunLoopBase::RunWork() + 42
13  browser_tests                       0x000000010c8af49a base::mac::CallWithEHFrame(void () block_pointer) + 10
14  browser_tests                       0x000000010c8bf61f base::MessagePumpCFRunLoopBase::RunWorkSource(void*) + 63
15  com.apple.CoreFoundation            0x00007fff7e05cff1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
16  com.apple.CoreFoundation            0x00007fff7e03fc3f __CFRunLoopDoSources0 + 271
17  com.apple.CoreFoundation            0x00007fff7e03f1ef __CFRunLoopRun + 1039
18  com.apple.CoreFoundation            0x00007fff7e03eb69 CFRunLoopRunSpecific + 409
19  browser_tests                       0x000000010c8c006f base::MessagePumpCFRunLoop::DoRun(base::MessagePump::Delegate*) + 79
20  browser_tests                       0x000000010c8bef2c base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 92
21  browser_tests                       0x000000010c8e3603 base::RunLoop::Run() + 51
22  browser_tests                       0x000000010c915039 base::Thread::ThreadMain() + 393
23  browser_tests                       0x000000010c90eff7 base::(anonymous namespace)::ThreadFunc(void*) + 87
24  libsystem_pthread.dylib             0x00007fffa558d87a _pthread_body + 286
25  libsystem_pthread.dylib             0x00007fffa558d75c _pthread_start + 400
26  libsystem_pthread.dylib             0x00007fffa558ce59 thread_start + 13



Job run: https://luci-milo.appspot.com/buildbot/chromium.fyi/Chromium%20Mac%2010.13/1
Logs: https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.fyi%2FChromium_Mac_10.13%2F1%2F%2B%2Frecipes%2Fsteps%2Fbrowser_tests%2F0%2Fstdout

What is the expected result?
No crashes in the stack sampler.

What happens instead?
The crash in the browser_tests test output log only has one symbolized trace inside libunwind from NativeStackSamplerMac::RecordStackSample. There are several other SEGV_MAPERR crashes in that run of browser_tests, but not all are symbolized in the test log. I ssh'd into the bot and pulled the second stack trace, and that is found in several crash reports.

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