--- Command "vm" (took 01.000040s):
DART_CONFIGURATION=ReleaseTSANARM64 xcodebuild/ReleaseTSANARM64/dart --profiler --profile_vm=false -Dtest_runner.configuration=vm-tsan-mac-release-arm64 --ignore-unrecognized-flags --packages=/Volumes/Work/s/w/ir/.dart_tool/package_config.json /Volumes/Work/s/w/ir/tests/ffi/async_void_function_callbacks_test.dart

exit code:
-6

stderr:
==================
WARNING: ThreadSanitizer: data race (pid=6565)
  Write of size 8 at 0x000108f0c8c0 by thread T4:
    #0 dart::Thread::set_current_tag(dart::UserTag const&) <null> (dartvm:arm64+0x10054f620)
    #1 dart::Dart::InitializeIsolate(dart::Thread*, bool, void*) <null> (dartvm:arm64+0x10035dcd4)
    #2 dart::CreateIsolate(dart::IsolateGroup*, bool, char const*, void*, char**) <null> (dartvm:arm64+0x1008a235c)
    #3 Dart_CreateIsolateGroup <null> (dartvm:arm64+0x1008a280c)
    #4 dart::bin::CreateIsolateGroupAndSetup(char const*, char const*, char const*, char const*, Dart_IsolateFlags*, void*, char**) <null> (dartvm:arm64+0x1000058e0)
    #5 dart::RunServiceTask::Run() <null> (dartvm:arm64+0x100531394)
    #6 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*) <null> (dartvm:arm64+0x100557410)
    #7 dart::ThreadPool::Worker::Main(unsigned long) <null> (dartvm:arm64+0x100557834)
    #8 dart::ThreadStart(void*) <null> (dartvm:arm64+0x1004d01bc)

  Previous read of size 8 at 0x000108f0c8c0 by thread T2 (mutexes: write M0):
    #0 dart::Profiler::SampleThread(dart::Thread*, dart::InterruptedThreadState const&) <null> (dartvm:arm64+0x1004d7070)
    #1 dart::ThreadInterrupter::InterruptThread(dart::OSThread*) <null> (dartvm:arm64+0x100556424)
    #2 dart::ThreadInterrupter::ThreadMain(unsigned long) <null> (dartvm:arm64+0x100555f64)
    #3 dart::ThreadStart(void*) <null> (dartvm:arm64+0x1004d01bc)

  Location is heap block of size 3856 at 0x000108f0c000 allocated by thread T4:
    #0 operator new(unsigned long) <null> (libclang_rt.tsan_osx_dynamic.dylib:arm64+0x8e814)
    #1 dart::ThreadRegistry::GetFreeThreadLocked(bool) <null> (dartvm:arm64+0x100557c04)
    #2 dart::Thread::AddActiveThread(dart::IsolateGroup*, dart::Isolate*, dart::Thread::TaskKind, bool) <null> (dartvm:arm64+0x10054fb18)
    #3 dart::Thread::EnterIsolate(dart::Isolate*) <null> (dartvm:arm64+0x10054f834)
    #4 dart::Isolate::InitIsolate(char const*, dart::IsolateGroup*, Dart_IsolateFlags const&, bool) <null> (dartvm:arm64+0x100394ccc)
    #5 dart::Dart::CreateIsolate(char const*, Dart_IsolateFlags const&, dart::IsolateGroup*) <null> (dartvm:arm64+0x10035d2ac)
    #6 dart::CreateIsolate(dart::IsolateGroup*, bool, char const*, void*, char**) <null> (dartvm:arm64+0x1008a2240)
    #7 Dart_CreateIsolateGroup <null> (dartvm:arm64+0x1008a280c)
    #8 dart::bin::CreateIsolateGroupAndSetup(char const*, char const*, char const*, char const*, Dart_IsolateFlags*, void*, char**) <null> (dartvm:arm64+0x1000058e0)
    #9 dart::RunServiceTask::Run() <null> (dartvm:arm64+0x100531394)
    #10 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*) <null> (dartvm:arm64+0x100557410)
    #11 dart::ThreadPool::Worker::Main(unsigned long) <null> (dartvm:arm64+0x100557834)
    #12 dart::ThreadStart(void*) <null> (dartvm:arm64+0x1004d01bc)

  Mutex M0 (0x000108900eb0) created at:
    #0 pthread_mutex_init <null> (libclang_rt.tsan_osx_dynamic.dylib:arm64+0x327ac)
    #1 dart::Mutex::Mutex() <null> (dartvm:arm64+0x10000c054)
    #2 dart::Mutex::Mutex() <null> (dartvm:arm64+0x10000c1e4)
    #3 dart::OSThread::Init() <null> (dartvm:arm64+0x1004cf994)
    #4 dart::Dart::DartInit(Dart_InitializeParams const*) <null> (dartvm:arm64+0x10035bb68)
    #5 dart::Dart::Init(Dart_InitializeParams const*) <null> (dartvm:arm64+0x10035c334)
    #6 Dart_Initialize <null> (dartvm:arm64+0x1008a1a34)
    #7 dart::bin::main(int, char**) <null> (dartvm:arm64+0x1000051e8)
    #8 main <null> (dartvm:arm64+0x100004084)

  Thread T4 (tid=69951, running) created by main thread at:
    #0 pthread_create <null> (libclang_rt.tsan_osx_dynamic.dylib:arm64+0x30e34)
    #1 dart::OSThread::TryStart(char const*, void (*)(unsigned long), unsigned long) <null> (dartvm:arm64+0x1004d007c)
    #2 dart::OSThread::Start(char const*, void (*)(unsigned long), unsigned long) <null> (dartvm:arm64+0x1004cfeb8)
    #3 dart::ThreadPool::RunImpl(std::_d::unique_ptr<dart::ThreadPool::Task, std::_d::default_delete<dart::ThreadPool::Task>>) <null> (dartvm:arm64+0x100556cc4)
    #4 dart::ServiceIsolate::Run() <null> (dartvm:arm64+0x1005309e8)
    #5 dart::Dart::Init(Dart_InitializeParams const*) <null> (dartvm:arm64+0x10035c390)
    #6 Dart_Initialize <null> (dartvm:arm64+0x1008a1a34)
    #7 dart::bin::main(int, char**) <null> (dartvm:arm64+0x1000051e8)
    #8 main <null> (dartvm:arm64+0x100004084)

  Thread T2 (tid=69949, running) created by main thread at:
    #0 pthread_create <null> (libclang_rt.tsan_osx_dynamic.dylib:arm64+0x30e34)
    #1 dart::OSThread::TryStart(char const*, void (*)(unsigned long), unsigned long) <null> (dartvm:arm64+0x1004d007c)
    #2 dart::OSThread::Start(char const*, void (*)(unsigned long), unsigned long) <null> (dartvm:arm64+0x1004cfeb8)
    #3 dart::ThreadInterrupter::Startup() <null> (dartvm:arm64+0x100555c44)
    #4 dart::Profiler::Init() <null> (dartvm:arm64+0x1004d553c)
    #5 dart::Dart::DartInit(Dart_InitializeParams const*) <null> (dartvm:arm64+0x10035c230)
    #6 dart::Dart::Init(Dart_InitializeParams const*) <null> (dartvm:arm64+0x10035c334)
    #7 Dart_Initialize <null> (dartvm:arm64+0x1008a1a34)
    #8 dart::bin::main(int, char**) <null> (dartvm:arm64+0x1000051e8)
    #9 main <null> (dartvm:arm64+0x100004084)

SUMMARY: ThreadSanitizer: data race (/Volumes/Work/s/w/ir/xcodebuild/ReleaseTSANARM64/dartvm:arm64+0x10054f620) in dart::Thread::set_current_tag(dart::UserTag const&)
==================

--- Re-run this test:
python3 tools/test.py -n vm-tsan-mac-release-arm64 ffi/async_void_function_callbacks_test/6