This was hit in a CI run. The unit test shutdown of the AppDomain hung here:
clr.dll!MsgWaitHelper(int numWaiters, void * * phEvent, int bWaitAll, unsigned long millis, int bAlertable) Line 4258 C++
[Inline Frame] clr.dll!Thread::DoAppropriateAptStateWait(int) Line 4323 C++
clr.dll!Thread::DoAppropriateWaitWorker(int countHandles, void * * handles, int waitAll, unsigned long millis, WaitMode mode) Line 4468 C++
clr.dll!Thread::DoAppropriateWait(int countHandles, void * * handles, int waitAll, unsigned long millis, WaitMode mode, PendingSync * syncState) Line 4135 C++
[Inline Frame] clr.dll!SOIntolerantTransitionHandler::SetNoException() Line 853 C++
clr.dll!CLREventBase::WaitEx(unsigned long dwMilliseconds, WaitMode mode, PendingSync * syncState) Line 849 C++
clr.dll!AppDomain::UnloadWait(ADID Id, ADUnloadSink * pSink) Line 11187 C++
clr.dll!AppDomain::UnloadById(ADID dwId, int fSync, int) Line 11166 C++
clr.dll!AppDomainNative::Unload(int dwId) Line 1235 C++
This was hit in a CI run. The unit test shutdown of the AppDomain hung here: