Runtime crashes on OSX running compiler unit tests

Description

The runtime is crashing on OSX when running the compiler unit tests. There is no specific test that causes the crash but the crash is very consistent (approaching 100%).

Unfortunately, due to this being a OSX dump, the dump files are too large for us to upload a full dump. The best we can get is a mini dump and json report:

This is blocking our ability to test on OSX because there is no specific test to disable to work around the crash that we can see. The same tests pass just fine on Windows and Linux.

Reproduction Steps

Run the C# compiler tests in CI. Any build in this pipeline with the main branch filter will demonstrate the crash.

https://dnceng-public.visualstudio.com/public/_build?definitionId=95&_a=summary&branchFilter=319%2C319

Expected behavior

Unit tests pass

Actual behavior

Crashes with the following stack trace:

__wait4
PROCCreateCrashDump(std::__1::vector<char const*, std::__1::allocator<char const*>>&, char*, int, bool)
PROCCreateCrashDumpIfEnabled
invoke_previous_action(sigaction*, int, __siginfo*, void*, bool)
_sigtramp
WKS::gc_heap::mark_ro_segments()
WKS::gc_heap::mark_phase(int, int)
WKS::gc_heap::gc1()
WKS::gc_heap::garbage_collect(int)
WKS::GCHeap::GarbageCollectGeneration(unsigned int, gc_reason)
WKS::gc_heap::try_allocate_more_space(alloc_context*, unsigned long, unsigned int, int)
WKS::GCHeap::Alloc(gc_alloc_context*, unsigned long, unsigned int)
Alloc(unsigned long, GC_ALLOC_FLAGS)
AllocateObject(MethodTable*)
MethodTable::FastBox(void**)
JIT_Box(CORINFO_CLASS_STRUCT_*, void*)
Microsoft.CodeAnalysis.UnitTests.Collections.WrapStructural_SimpleInt.Equals(Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt)
System.Linq.Enumerable.Contains[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]](System.Collections.Generic.IEnumerable`1<Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt>, Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, System.Collections.Generic.IEqualityComparer`1<Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt>)
Microsoft.CodeAnalysis.UnitTests.Collections.TestBase`1[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]].CreateSortedSet(System.Collections.Generic.IEnumerable`1<Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt>, Int32, Int32)
Microsoft.CodeAnalysis.UnitTests.Collections.TestBase`1[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]].CreateEnumerable(EnumerableType, System.Collections.Generic.IEnumerable`1<Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt>, Int32, Int32, Int32)
Microsoft.CodeAnalysis.UnitTests.Collections.ISet_Generic_Tests`1[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]].ISet_Generic_Overlaps(EnumerableType, Int32, Int32, Int32, Int32)
DynamicClass.InvokeStub_ISet_Generic_Tests`1.ISet_Generic_Overlaps(System.Object, System.Span`1<System.Object>)
System.Reflection.MethodBaseInvoker.InvokeWithManyArgs(System.Object, System.Reflection.BindingFlags, System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo)
Xunit.Sdk.TestInvoker`1[[System.__Canon, System.Private.CoreLib]].CallTestMethod(System.Object)
Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1+<<InvokeTestMethodAsync>b__1>d[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1+<<InvokeTestMethodAsync>b__1>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<<InvokeTestMethodAsync>b__1>d<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1+<<InvokeTestMethodAsync>b__1>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<<InvokeTestMethodAsync>b__1>d<System.__Canon> ByRef)
Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1[[System.__Canon, System.Private.CoreLib]].<InvokeTestMethodAsync>b__1()
Xunit.Sdk.ExecutionTimer+<AggregateAsync>d__4.MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.ExecutionTimer+<AggregateAsync>d__4, xunit.execution.dotnet]](<AggregateAsync>d__4 ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Xunit.Sdk.ExecutionTimer+<AggregateAsync>d__4, xunit.execution.dotnet]](<AggregateAsync>d__4 ByRef)
Xunit.Sdk.ExecutionTimer.AggregateAsync(System.Func`1<System.Threading.Tasks.Task>)
Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1[[System.__Canon, System.Private.CoreLib]].<InvokeTestMethodAsync>b__0()
Xunit.Sdk.ExceptionAggregator+<RunAsync>d__9.MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.ExceptionAggregator+<RunAsync>d__9, xunit.core]](<RunAsync>d__9 ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Xunit.Sdk.ExceptionAggregator+<RunAsync>d__9, xunit.core]](<RunAsync>d__9 ByRef)
Xunit.Sdk.ExceptionAggregator.RunAsync(System.Func`1<System.Threading.Tasks.Task>)
Xunit.Sdk.TestInvoker`1+<InvokeTestMethodAsync>d__48[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestInvoker`1+<InvokeTestMethodAsync>d__48[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<InvokeTestMethodAsync>d__48<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.Decimal, System.Private.CoreLib]].Start[[Xunit.Sdk.TestInvoker`1+<InvokeTestMethodAsync>d__48[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<InvokeTestMethodAsync>d__48<System.__Canon> ByRef)
Xunit.Sdk.TestInvoker`1[[System.__Canon, System.Private.CoreLib]].InvokeTestMethodAsync(System.Object)
Xunit.Sdk.XunitTestInvoker.InvokeTestMethodAsync(System.Object)
Xunit.Sdk.TestInvoker`1+<<RunAsync>b__47_0>d[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestInvoker`1+<<RunAsync>b__47_0>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<<RunAsync>b__47_0>d<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.Decimal, System.Private.CoreLib]].Start[[Xunit.Sdk.TestInvoker`1+<<RunAsync>b__47_0>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<<RunAsync>b__47_0>d<System.__Canon> ByRef)
Xunit.Sdk.TestInvoker`1[[System.__Canon, System.Private.CoreLib]].<RunAsync>b__47_0()
Xunit.Sdk.ExceptionAggregator+<RunAsync>d__10`1[[System.Decimal, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.ExceptionAggregator+<RunAsync>d__10`1[[System.Decimal, System.Private.CoreLib]], xunit.core]](<RunAsync>d__10`1<System.Decimal> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.Decimal, System.Private.CoreLib]].Start[[Xunit.Sdk.ExceptionAggregator+<RunAsync>d__10`1[[System.Decimal, System.Private.CoreLib]], xunit.core]](<RunAsync>d__10`1<System.Decimal> ByRef)
Xunit.Sdk.ExceptionAggregator.RunAsync[[System.Decimal, System.Private.CoreLib]](System.Func`1<System.Threading.Tasks.Task`1<System.Decimal>>)
Xunit.Sdk.TestInvoker`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestRunner.InvokeTestMethodAsync(Xunit.Sdk.ExceptionAggregator)
Xunit.Sdk.XunitTestRunner+<InvokeTestAsync>d__4.MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.XunitTestRunner+<InvokeTestAsync>d__4, xunit.execution.dotnet]](<InvokeTestAsync>d__4 ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.XunitTestRunner+<InvokeTestAsync>d__4, xunit.execution.dotnet]](<InvokeTestAsync>d__4 ByRef)
Xunit.Sdk.XunitTestRunner.InvokeTestAsync(Xunit.Sdk.ExceptionAggregator)
Xunit.Sdk.TestRunner`1+<>c__DisplayClass43_0[[System.__Canon, System.Private.CoreLib]].<RunAsync>b__0()
Xunit.Sdk.ExceptionAggregator+<RunAsync>d__10`1[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.ExceptionAggregator+<RunAsync>d__10`1[[System.__Canon, System.Private.CoreLib]], xunit.core]](<RunAsync>d__10`1<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.ExceptionAggregator+<RunAsync>d__10`1[[System.__Canon, System.Private.CoreLib]], xunit.core]](<RunAsync>d__10`1<System.__Canon> ByRef)
Xunit.Sdk.ExceptionAggregator.RunAsync[[System.__Canon, System.Private.CoreLib]](System.Func`1<System.Threading.Tasks.Task`1<System.__Canon>>)
Xunit.Sdk.TestRunner`1+<RunAsync>d__43[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestRunner`1+<RunAsync>d__43[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__43<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestRunner`1+<RunAsync>d__43[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__43<System.__Canon> ByRef)
Xunit.Sdk.TestRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestCaseRunner.RunTestAsync()
Xunit.Sdk.TestCaseRunner`1+<RunAsync>d__19[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestCaseRunner`1+<RunAsync>d__19[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__19<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestCaseRunner`1+<RunAsync>d__19[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__19<System.__Canon> ByRef)
Xunit.Sdk.TestCaseRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestCase.RunAsync(Xunit.Abstractions.IMessageSink, Xunit.Sdk.IMessageBus, System.Object[], Xunit.Sdk.ExceptionAggregator, System.Threading.CancellationTokenSource)
Xunit.Sdk.XunitTestMethodRunner.RunTestCaseAsync(Xunit.Sdk.IXunitTestCase)
Xunit.Sdk.TestMethodRunner`1+<RunTestCasesAsync>d__32[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestMethodRunner`1+<RunTestCasesAsync>d__32[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestCasesAsync>d__32<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestMethodRunner`1+<RunTestCasesAsync>d__32[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestCasesAsync>d__32<System.__Canon> ByRef)
Xunit.Sdk.TestMethodRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestCasesAsync()
Xunit.Sdk.TestMethodRunner`1+<RunAsync>d__31[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestMethodRunner`1+<RunAsync>d__31[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__31<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestMethodRunner`1+<RunAsync>d__31[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__31<System.__Canon> ByRef)
Xunit.Sdk.TestMethodRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestClassRunner.RunTestMethodAsync(Xunit.Abstractions.ITestMethod, Xunit.Abstractions.IReflectionMethodInfo, System.Collections.Generic.IEnumerable`1<Xunit.Sdk.IXunitTestCase>, System.Object[])
Xunit.Sdk.TestClassRunner`1+<RunTestMethodsAsync>d__38[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestClassRunner`1+<RunTestMethodsAsync>d__38[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestMethodsAsync>d__38<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestClassRunner`1+<RunTestMethodsAsync>d__38[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestMethodsAsync>d__38<System.__Canon> ByRef)
Xunit.Sdk.TestClassRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestMethodsAsync()
Xunit.Sdk.TestClassRunner`1+<RunAsync>d__37[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestClassRunner`1+<RunAsync>d__37[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__37<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestClassRunner`1+<RunAsync>d__37[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__37<System.__Canon> ByRef)
Xunit.Sdk.TestClassRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestCollectionRunner.RunTestClassAsync(Xunit.Abstractions.ITestClass, Xunit.Abstractions.IReflectionTypeInfo, System.Collections.Generic.IEnumerable`1<Xunit.Sdk.IXunitTestCase>)
Xunit.Sdk.TestCollectionRunner`1+<RunTestClassesAsync>d__28[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestCollectionRunner`1+<RunTestClassesAsync>d__28[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestClassesAsync>d__28<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestCollectionRunner`1+<RunTestClassesAsync>d__28[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestClassesAsync>d__28<System.__Canon> ByRef)
Xunit.Sdk.TestCollectionRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestClassesAsync()
Xunit.Sdk.TestCollectionRunner`1+<RunAsync>d__27[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestCollectionRunner`1+<RunAsync>d__27[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__27<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestCollectionRunner`1+<RunAsync>d__27[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__27<System.__Canon> ByRef)
Xunit.Sdk.TestCollectionRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestAssemblyRunner.RunTestCollectionAsync(Xunit.Sdk.IMessageBus, Xunit.Abstractions.ITestCollection, System.Collections.Generic.IEnumerable`1<Xunit.Sdk.IXunitTestCase>, System.Threading.CancellationTokenSource)
Xunit.Sdk.TestAssemblyRunner`1+<RunTestCollectionsAsync>d__42[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestAssemblyRunner`1+<RunTestCollectionsAsync>d__42[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestCollectionsAsync>d__42<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestAssemblyRunner`1+<RunTestCollectionsAsync>d__42[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunTestCollectionsAsync>d__42<System.__Canon> ByRef)
Xunit.Sdk.TestAssemblyRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestCollectionsAsync(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource)
Xunit.Sdk.XunitTestAssemblyRunner.<>n__0(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource)
Xunit.Sdk.XunitTestAssemblyRunner+<RunTestCollectionsAsync>d__14.MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.XunitTestAssemblyRunner+<RunTestCollectionsAsync>d__14, xunit.execution.dotnet]](<RunTestCollectionsAsync>d__14 ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.XunitTestAssemblyRunner+<RunTestCollectionsAsync>d__14, xunit.execution.dotnet]](<RunTestCollectionsAsync>d__14 ByRef)
Xunit.Sdk.XunitTestAssemblyRunner.RunTestCollectionsAsync(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource)
Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[[System.__Canon, System.Private.CoreLib]].MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__41<System.__Canon> ByRef)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__41<System.__Canon> ByRef)
Xunit.Sdk.TestAssemblyRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
Xunit.Sdk.XunitTestFrameworkExecutor+<RunTestCases>d__8.MoveNext()
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.XunitTestFrameworkExecutor+<RunTestCases>d__8, xunit.execution.dotnet]](<RunTestCases>d__8 ByRef)
System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start[[Xunit.Sdk.XunitTestFrameworkExecutor+<RunTestCases>d__8, xunit.execution.dotnet]](<RunTestCases>d__8 ByRef)
Xunit.Sdk.XunitTestFrameworkExecutor.RunTestCases(System.Collections.Generic.IEnumerable`1<Xunit.Sdk.IXunitTestCase>, Xunit.Abstractions.IMessageSink, Xunit.Abstractions.ITestFrameworkExecutionOptions)
Xunit.Sdk.TestFrameworkExecutor`1[[System.__Canon, System.Private.CoreLib]].RunTests(System.Collections.Generic.IEnumerable`1<Xunit.Abstractions.ITestCase>, Xunit.Abstractions.IMessageSink, Xunit.Abstractions.ITestFrameworkExecutionOptions)
Xunit.Xunit2.RunTests(System.Collections.Generic.IEnumerable`1<Xunit.Abstractions.ITestCase>, Xunit.Abstractions.IMessageSink, Xunit.Abstractions.ITestFrameworkExecutionOptions)
Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IRunContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IFrameworkHandle, LoggerHelper, Xunit.Runner.VisualStudio.TestPlatformContext, Xunit.Runner.VisualStudio.RunSettings, Xunit.IMessageSinkWithTypes, Xunit.Runner.VisualStudio.AssemblyRunInfo)
Xunit.Runner.VisualStudio.VsTestRunner+<>c__DisplayClass20_0.<RunTests>b__4(Xunit.Runner.VisualStudio.AssemblyRunInfo)
System.Collections.Generic.List`1[[System.__Canon, System.Private.CoreLib]].ForEach(System.Action`1<System.__Canon>)
Xunit.Runner.VisualStudio.VsTestRunner.RunTests(Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IRunContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IFrameworkHandle, LoggerHelper, Xunit.Runner.VisualStudio.TestPlatformContext, Xunit.Runner.VisualStudio.RunSettings, System.Func`1<System.Collections.Generic.List`1<Xunit.Runner.VisualStudio.AssemblyRunInfo>>)
Xunit.Runner.VisualStudio.VsTestRunner.Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.ITestExecutor.RunTests(System.Collections.Generic.IEnumerable`1<System.String>, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IRunContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IFrameworkHandle)
Microsoft.VisualStudio.TestPlatform.Common.ExtensionDecorators.SerialTestRunDecorator.RunTests(System.Collections.Generic.IEnumerable`1<System.String>, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IRunContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IFrameworkHandle)
Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.RunTestsWithSources.InvokeExecutor(Microsoft.VisualStudio.TestPlatform.Common.ExtensionFramework.Utilities.LazyExtension`2<Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.ITestExecutor,Microsoft.VisualStudio.TestPlatform.Common.Interfaces.ITestExecutorCapabilities>, System.Tuple`2<System.Uri,System.String>, Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Adapter.RunContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter.IFrameworkHandle)
Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.RunTestInternalWithExecutors(System.Collections.Generic.IEnumerable`1<System.Tuple`2<System.Uri,System.String>>, Int64)
Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.RunTestsInternal()
Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.RunTests()
Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.ExecutionManager.StartTestRun(System.Collections.Generic.Dictionary`2<System.String,System.Collections.Generic.IEnumerable`1<System.String>>, System.String, System.String, Microsoft.VisualStudio.TestPlatform.ObjectModel.Engine.ClientProtocol.TestExecutionContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Engine.ITestCaseEventsHandler, Microsoft.VisualStudio.TestPlatform.ObjectModel.Client.IInternalTestRunEventsHandler)
Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.TestRequestHandler+<>c__DisplayClass45_4.<OnMessageReceived>b__3()
Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.TestRequestHandler+<>c.<.ctor>b__31_2(System.Action)
Microsoft.VisualStudio.TestPlatform.Utilities.JobQueue`1[[System.__Canon, System.Private.CoreLib]].SafeProcessJob(System.__Canon)
Microsoft.VisualStudio.TestPlatform.Utilities.JobQueue`1[[System.__Canon, System.Private.CoreLib]].BackgroundJobProcessor(System.String)
Microsoft.VisualStudio.TestPlatform.Utilities.JobQueue`1[[System.__Canon, System.Private.CoreLib]].<.ctor>b__16_0()
System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread)
System.Threading.Thread.StartCallback()
DispatchCallSimple(unsigned long*, unsigned int, unsigned long long, unsigned int)
ThreadNative::KickOffThread_Worker(void*)
ManagedThreadBase_DispatchOuter(ManagedThreadCallState*)
ManagedThreadBase::KickOff(void (*)(void*), void*)
ThreadNative::KickOffThread(void*)
CorUnix::CPalThread::ThreadEntry(void*)
_pthread_start

Regression?

Yes this is a recent regression that came around the time of adopting the .NET 8 SDK GA

Known Workarounds

None

Configuration

Complicated

Other information

At the moment we are collecting OSX dumps with the following settings:

DOTNET_DbgEnableMiniDump=1
DOTNET_DbgMiniDumpName=/cores/crash.%d.%e.dmp
DOTNET_DbgMiniDumpType=1
DOTNET_EnableCrashReport=1

Happy to adjust this as need to help with the investigation.

Tagging subscribers to this area: @dotnet/gc See info in area-owners.md if you want to be subscribed.

Issue Details

### Description The runtime is crashing on OSX when running the compiler unit tests. There is no specific test that causes the crash but the crash is very consistent (approaching 100%). Unfortunately, due to this being a OSX dump, the dump files are too large for us to upload a full dump. The best we can get is a mini dump and json report: - [crash.dmp][1] - [crash.dmp.json][2] This is blocking our ability to test on OSX because there is no specific test to disable to work around the crash that we can see. The same tests pass just fine on Windows and Linux. [1]: https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-roslyn-refs-pull-71706-merge-f38fe728c96a430d94/Microsoft.CodeAnalysis.CSharp.Syntax.UnitTests_Microsoft.CodeAnalysis.Rebuild.UnitTests_Microsoft.CodeAnalysis.Scripting.UnitTests_Microsoft.CodeAnaly..._3/1/crash.34178.dotnet.dmp?helixlogtype=result [2]: https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-roslyn-refs-pull-71706-merge-f38fe728c96a430d94/Microsoft.CodeAnalysis.CSharp.Syntax.UnitTests_Microsoft.CodeAnalysis.Rebuild.UnitTests_Microsoft.CodeAnalysis.Scripting.UnitTests_Microsoft.CodeAnaly..._3/1/crash.34178.dotnet.dmp.crashreport.json?helixlogtype=result ### Reproduction Steps Run the C# compiler tests in CI. Any build in this pipeline with the `main` branch filter will demonstrate the crash. https://dnceng-public.visualstudio.com/public/_build?definitionId=95&_a=summary&branchFilter=319%2C319 ### Expected behavior Unit tests pass ### Actual behavior Crashes with the following stack trace: ``` __wait4 PROCCreateCrashDump(std::__1::vector>&, char*, int, bool) PROCCreateCrashDumpIfEnabled invoke_previous_action(sigaction*, int, __siginfo*, void*, bool) _sigtramp WKS::gc_heap::mark_ro_segments() WKS::gc_heap::mark_phase(int, int) WKS::gc_heap::gc1() WKS::gc_heap::garbage_collect(int) WKS::GCHeap::GarbageCollectGeneration(unsigned int, gc_reason) WKS::gc_heap::try_allocate_more_space(alloc_context*, unsigned long, unsigned int, int) WKS::GCHeap::Alloc(gc_alloc_context*, unsigned long, unsigned int) Alloc(unsigned long, GC_ALLOC_FLAGS) AllocateObject(MethodTable*) MethodTable::FastBox(void**) JIT_Box(CORINFO_CLASS_STRUCT_*, void*) Microsoft.CodeAnalysis.UnitTests.Collections.WrapStructural_SimpleInt.Equals(Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt) System.Linq.Enumerable.Contains[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]](System.Collections.Generic.IEnumerable`1, Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, System.Collections.Generic.IEqualityComparer`1) Microsoft.CodeAnalysis.UnitTests.Collections.TestBase`1[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]].CreateSortedSet(System.Collections.Generic.IEnumerable`1, Int32, Int32) Microsoft.CodeAnalysis.UnitTests.Collections.TestBase`1[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]].CreateEnumerable(EnumerableType, System.Collections.Generic.IEnumerable`1, Int32, Int32, Int32) Microsoft.CodeAnalysis.UnitTests.Collections.ISet_Generic_Tests`1[[Microsoft.CodeAnalysis.UnitTests.Collections.SimpleInt, Microsoft.CodeAnalysis.UnitTests]].ISet_Generic_Overlaps(EnumerableType, Int32, Int32, Int32, Int32) DynamicClass.InvokeStub_ISet_Generic_Tests`1.ISet_Generic_Overlaps(System.Object, System.Span`1) System.Reflection.MethodBaseInvoker.InvokeWithManyArgs(System.Object, System.Reflection.BindingFlags, System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo) Xunit.Sdk.TestInvoker`1[[System.__Canon, System.Private.CoreLib]].CallTestMethod(System.Object) Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1+<b__1>d[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestInvoker`1+<>c__DisplayClass48_1+<b__1>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<b__1>d ByRef) 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System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestInvoker`1+<b__47_0>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<b__47_0>d ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.Decimal, System.Private.CoreLib]].Start[[Xunit.Sdk.TestInvoker`1+<b__47_0>d[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<b__47_0>d ByRef) Xunit.Sdk.TestInvoker`1[[System.__Canon, System.Private.CoreLib]].b__47_0() Xunit.Sdk.ExceptionAggregator+d__10`1[[System.Decimal, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.ExceptionAggregator+d__10`1[[System.Decimal, System.Private.CoreLib]], xunit.core]](d__10`1 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.Decimal, System.Private.CoreLib]].Start[[Xunit.Sdk.ExceptionAggregator+d__10`1[[System.Decimal, System.Private.CoreLib]], xunit.core]](d__10`1 ByRef) 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System.Private.CoreLib]], xunit.core]](d__10`1 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.ExceptionAggregator+d__10`1[[System.__Canon, System.Private.CoreLib]], xunit.core]](d__10`1 ByRef) Xunit.Sdk.ExceptionAggregator.RunAsync[[System.__Canon, System.Private.CoreLib]](System.Func`1>) Xunit.Sdk.TestRunner`1+d__43[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestRunner`1+d__43[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__43 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestRunner`1+d__43[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__43 ByRef) Xunit.Sdk.TestRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync() Xunit.Sdk.XunitTestCaseRunner.RunTestAsync() Xunit.Sdk.TestCaseRunner`1+d__19[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestCaseRunner`1+d__19[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__19 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestCaseRunner`1+d__19[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__19 ByRef) Xunit.Sdk.TestCaseRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync() Xunit.Sdk.XunitTestCase.RunAsync(Xunit.Abstractions.IMessageSink, Xunit.Sdk.IMessageBus, System.Object[], Xunit.Sdk.ExceptionAggregator, System.Threading.CancellationTokenSource) Xunit.Sdk.XunitTestMethodRunner.RunTestCaseAsync(Xunit.Sdk.IXunitTestCase) Xunit.Sdk.TestMethodRunner`1+d__32[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestMethodRunner`1+d__32[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__32 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestMethodRunner`1+d__32[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__32 ByRef) Xunit.Sdk.TestMethodRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestCasesAsync() Xunit.Sdk.TestMethodRunner`1+d__31[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestMethodRunner`1+d__31[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__31 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestMethodRunner`1+d__31[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__31 ByRef) Xunit.Sdk.TestMethodRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync() Xunit.Sdk.XunitTestClassRunner.RunTestMethodAsync(Xunit.Abstractions.ITestMethod, Xunit.Abstractions.IReflectionMethodInfo, System.Collections.Generic.IEnumerable`1, System.Object[]) Xunit.Sdk.TestClassRunner`1+d__38[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestClassRunner`1+d__38[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__38 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestClassRunner`1+d__38[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__38 ByRef) Xunit.Sdk.TestClassRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestMethodsAsync() Xunit.Sdk.TestClassRunner`1+d__37[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestClassRunner`1+d__37[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__37 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestClassRunner`1+d__37[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__37 ByRef) Xunit.Sdk.TestClassRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync() Xunit.Sdk.XunitTestCollectionRunner.RunTestClassAsync(Xunit.Abstractions.ITestClass, Xunit.Abstractions.IReflectionTypeInfo, System.Collections.Generic.IEnumerable`1) Xunit.Sdk.TestCollectionRunner`1+d__28[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestCollectionRunner`1+d__28[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__28 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, 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System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.XunitTestAssemblyRunner+d__14, xunit.execution.dotnet]](d__14 ByRef) Xunit.Sdk.XunitTestAssemblyRunner.RunTestCollectionsAsync(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource) Xunit.Sdk.TestAssemblyRunner`1+d__41[[System.__Canon, System.Private.CoreLib]].MoveNext() System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestAssemblyRunner`1+d__41[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__41 ByRef) System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestAssemblyRunner`1+d__41[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](d__41 ByRef) Xunit.Sdk.TestAssemblyRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync() Xunit.Sdk.XunitTestFrameworkExecutor+d__8.MoveNext() 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Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.RunTests() Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.ExecutionManager.StartTestRun(System.Collections.Generic.Dictionary`2>, System.String, System.String, Microsoft.VisualStudio.TestPlatform.ObjectModel.Engine.ClientProtocol.TestExecutionContext, Microsoft.VisualStudio.TestPlatform.ObjectModel.Engine.ITestCaseEventsHandler, Microsoft.VisualStudio.TestPlatform.ObjectModel.Client.IInternalTestRunEventsHandler) Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.TestRequestHandler+<>c__DisplayClass45_4.b__3() Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.TestRequestHandler+<>c.<.ctor>b__31_2(System.Action) Microsoft.VisualStudio.TestPlatform.Utilities.JobQueue`1[[System.__Canon, System.Private.CoreLib]].SafeProcessJob(System.__Canon) Microsoft.VisualStudio.TestPlatform.Utilities.JobQueue`1[[System.__Canon, System.Private.CoreLib]].BackgroundJobProcessor(System.String) Microsoft.VisualStudio.TestPlatform.Utilities.JobQueue`1[[System.__Canon, System.Private.CoreLib]].<.ctor>b__16_0() System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread) System.Threading.Thread.StartCallback() DispatchCallSimple(unsigned long*, unsigned int, unsigned long long, unsigned int) ThreadNative::KickOffThread_Worker(void*) ManagedThreadBase_DispatchOuter(ManagedThreadCallState*) ManagedThreadBase::KickOff(void (*)(void*), void*) ThreadNative::KickOffThread(void*) CorUnix::CPalThread::ThreadEntry(void*) _pthread_start ``` ### Regression? Yes this is a recent regression that came around the time of adopting the .NET 8 SDK GA ### Known Workarounds None ### Configuration Complicated ### Other information At the moment we are collecting OSX dumps with the following settings: ```sh DOTNET_DbgEnableMiniDump=1 DOTNET_DbgMiniDumpName=/cores/crash.%d.%e.dmp DOTNET_DbgMiniDumpType=1 DOTNET_EnableCrashReport=1 ``` Happy to adjust this as need to help with the investigation.

Author:	jaredpar
Assignees:	-
Labels:	`area-GC-coreclr`, `untriaged`, `needs-area-label`
Milestone:	-

I have got mac devices, is it possible to reproduce these locally?

GC Regions aren't enabled for OSX?

I have got mac devices, is it possible to reproduce these locally?

We tried running the tests locally on Macs and the issue did not reproduce. Unsure if it's specific to this hardware or some other factor. It reproduces very reliably in CI.

GC Regions aren't enabled for OSX?

Yes, it is not enabled for OSX, because of the large dump issue.

Then maybe the issue can be reproduced on other platforms by disabling regions?

We certainly can disable region using DOTNET_GCName=clrgc, this should work on any platforms.

Do we know how to read the dump? When I tried to open the dump in Visual Studio, it complained wrong file format. When I tried to open it in WinDBG, it reported 25 threads, lm showed no modules. I tried to open it with lldb on osx, this time it shows 21 threads, but all thread back stack traces are just numbers.

The crash report is more interesting, it does indicate mark_ro_segment is causing a trap

     {
      "is_managed" : "false",
      "module_address" : "0x7ff818c5a000",
      "stack_pointer" : "0x70000a07df40",
      "native_address" : "0x7ff818c5d5ed",
      "native_offset" : "0x1d",
      "native_image_offset" : "0x35ed",
      "unmanaged_name" : "_sigtramp",
      "native_module" : "libsystem_platform.dylib"
     },
     {
      "is_managed" : "false",
      "module_address" : "0x101394000",
      "stack_pointer" : "0x70000a07e490",
      "native_address" : "0x101676e05",
      "native_offset" : "0x2b5",
      "native_image_offset" : "0x2e2e05",
      "unmanaged_name" : "WKS::gc_heap::mark_ro_segments()",
      "native_module" : "libcoreclr.dylib"
     },

The native_image_offset is potentially useful, it might led us to the instruction where it failed, but I am not sure how to proceed from there.

Do we know how to read the dump? When I tried to open the dump in Visual Studio, it complained wrong file format.

My understanding from chatting with @hoyosjs is that Mac dumps are only openable on Mac.

We certainly can disable region using DOTNET_GCName=clrgc, this should work on any platforms.

I queued up a PR that disables this for Linux. That should be fairly apples to apples with our Mac runs. If it does crash the dump should upload cause it doesn't have the same size issues that Mac's do.

Got a complete run on Linux with DOTNET_GCName=libclrgc.so and everything passed.

Got a complete run on Linux with DOTNET_GCName=libclrgc.so and everything passed.

That's sad, which means we have to work with OSX then. Is it possible to capture stress log and/or run with customized clrgc with instrumentation?

I see local test crashes as well after I sync & rebuild runtime (after git clean -dfx)

(lldb) clrstack -a
OS Thread Id: 0x10aba58 (1)
        Child SP               IP Call Site
00007FF7BFEF9B38 0000000104664b33 [HelperMethodFrame_PROTECTOBJ: 00007ff7bfef9b38] System.RuntimeMethodHandle.InvokeMethod(System.Object, Void**, System.Signature, Boolean)
00007FF7BFEF9DE0 000000012E28696D System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(System.Object, IntPtr*) [/Users/furt/github/wfurt-runtime2/src/coreclr/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.CoreCLR.cs @ 36]
    PARAMETERS:
        this (0x00007FF7BFEF9DF8) = 0x0000000190476978
        obj (0x00007FF7BFEF9DF0) = 0x0000000190476730
        args (0x00007FF7BFEF9DE8) = 0x0000000000000000

00007FF7BFEF9E10 000000012E26E18F System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(System.Object, System.Reflection.BindingFlags) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs @ 57]
    PARAMETERS:
        this (0x00007FF7BFEF9E78) = 0x0000000190476978
        obj (0x00007FF7BFEF9E70) = 0x0000000190476730
        invokeAttr (0x00007FF7BFEF9E6C) = 0x9047673000000000
    LOCALS:
        0x00007FF7BFEF9E60 = 0x0000000000000000
        0x00007FF7BFEF9E58 = 0x000000019048fb68

00007FF7BFEF9E90 000000012E28537B System.Reflection.RuntimeMethodInfo.Invoke(System.Object, System.Reflection.BindingFlags, System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Reflection/RuntimeMethodInfo.cs @ 127]
    PARAMETERS:
        this (0x00007FF7BFEF9EE8) = 0x00000001902b6bf8
        obj (0x00007FF7BFEF9EE0) = 0x0000000190476730
        invokeAttr (0x00007FF7BFEF9EDC) = 0x9047673000000000
        binder (0x00007FF7BFEF9ED0) = 0x0000000000000000
        parameters (0x00007FF7BFEF9EC8) = 0x0000000190052128
        culture (0x00007FF7BFEF9EC0) = 0x0000000000000000
    LOCALS:
        0x00007FF7BFEF9EBC = 0x0000000000000000

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00007FF7BFEFCBE0 000000012EF8D994 Xunit.Sdk.TestAssemblyRunner`1[[System.__Canon, System.Private.CoreLib]].RunTestCollectionsAsync(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource)
    PARAMETERS:
        this (0x00007FF7BFEFCC60) = 0x000000019043cb58
        messageBus (0x00007FF7BFEFCC58) = 0x00000001904494f8
        cancellationTokenSource (0x00007FF7BFEFCC50) = 0x000000019043cc30
    LOCALS:
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00007FF7BFEFCC80 000000012EF8D678 Xunit.Sdk.XunitTestAssemblyRunner.<>n__0(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource)
    PARAMETERS:
        this (0x00007FF7BFEFCC98) = 0x000000019043cb58
        messageBus (0x00007FF7BFEFCC90) = 0x00000001904494f8
        cancellationTokenSource (0x00007FF7BFEFCC88) = 0x000000019043cc30

00007FF7BFEFCCB0 000000012EF8C155 Xunit.Sdk.XunitTestAssemblyRunner+<RunTestCollectionsAsync>d__14.MoveNext() [/_/src/xunit.execution/Sdk/Frameworks/Runners/XunitTestAssemblyRunner.cs @ 165]
    PARAMETERS:
        this (0x00007FF7BFEFCF20) = 0x00007ff7bfefd060
    LOCALS:
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        0x00007FF7BFEFCF10 = 0x000000019043cb58
        0x00007FF7BFEFCF08 = 0x0000000000000000
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        0x00007FF7BFEFCEF8 = 0x0000000000000000
        0x00007FF7BFEFCEF0 = 0x0000000000000000
        0x00007FF7BFEFCED8 = 0x0000000000000000
        0x00007FF7BFEFCED0 = 0x0000000000000000
        0x00007FF7BFEFCEC8 = 0x0000000000000000
        0x00007FF7BFEFCEC0 = 0x0000000000000000
        0x00007FF7BFEFCEB8 = 0x0000000000000000
        0x00007FF7BFEFCEB0 = 0x0000000000000000
        0x00007FF7BFEFCEA8 = 0x0000000000000000

00007FF7BFEFCF60 000000012EF8B454 System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.XunitTestAssemblyRunner+<RunTestCollectionsAsync>d__14, xunit.execution.dotnet]](<RunTestCollectionsAsync>d__14 ByRef) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs @ 38]
    PARAMETERS:
        stateMachine (0x00007FF7BFEFD018) = 0x00007ff7bfefd060
    LOCALS:
        0x00007FF7BFEFD010 = 0x0000000190064118
        0x00007FF7BFEFD008 = 0x0000000000000000
        0x00007FF7BFEFD000 = 0x0000000000000000
        0x00007FF7BFEFCFF8 = 0x0000000000000000

00007FF7BFEFD030 000000012EF8B3B0 System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.XunitTestAssemblyRunner+<RunTestCollectionsAsync>d__14, xunit.execution.dotnet]](<RunTestCollectionsAsync>d__14 ByRef) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncTaskMethodBuilderT.cs @ 35]
    PARAMETERS:
        this (0x00007FF7BFEFD048) = 0x00007ff7bfefd0a8
        stateMachine (0x00007FF7BFEFD038) = 0x00007ff7bfefd060

00007FF7BFEFD060 000000012EF8B355 Xunit.Sdk.XunitTestAssemblyRunner.RunTestCollectionsAsync(Xunit.Sdk.IMessageBus, System.Threading.CancellationTokenSource)
    PARAMETERS:
        this (0x00007FF7BFEFD0F8) = 0x000000019043cb58
        messageBus (0x00007FF7BFEFD0F0) = 0x00000001904494f8
        cancellationTokenSource (0x00007FF7BFEFD0E8) = 0x000000019043cc30
    LOCALS:
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00007FF7BFEFD110 000000012ED7883F Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[[System.__Canon, System.Private.CoreLib]].MoveNext() [/_/src/xunit.execution/Sdk/Frameworks/Runners/TestAssemblyRunner.cs @ 196]
    PARAMETERS:
        this (0x00007FF7BFEFD260) = 0x00007ff7bfefd388
    LOCALS:
        0x00007FF7BFEFD254 = 0x00000000ffffffff
        0x00007FF7BFEFD248 = 0x000000019043cb58
        0x00007FF7BFEFD240 = 0x0000000000000000
        0x00007FF7BFEFD238 = 0x0000000190449470
        0x00007FF7BFEFD230 = 0x0000000190063558
        0x00007FF7BFEFD228 = 0x0000000190469258
        0x00007FF7BFEFD220 = 0x0000000000000000
        0x00007FF7BFEFD218 = 0x0000000000000000
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00007FF7BFEFD280 000000012ED78468 System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__41<System.__Canon> ByRef) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs @ 38]
    PARAMETERS:
        stateMachine (0x00007FF7BFEFD308) = 0x00007ff7bfefd388
    LOCALS:
        0x00007FF7BFEFD300 = 0x0000000190064118
        0x00007FF7BFEFD2F8 = 0x0000000000000000
        0x00007FF7BFEFD2F0 = 0x0000000000000000
        0x00007FF7BFEFD2E8 = 0x0000000000000000

00007FF7BFEFD330 000000012ED78380 System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib]].Start[[Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[[System.__Canon, System.Private.CoreLib]], xunit.execution.dotnet]](<RunAsync>d__41<System.__Canon> ByRef) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncTaskMethodBuilderT.cs @ 35]
    PARAMETERS:
        this (0x00007FF7BFEFD350) = 0x00007ff7bfefd3b8
        stateMachine (0x00007FF7BFEFD340) = 0x00007ff7bfefd388

00007FF7BFEFD370 000000012ED782A5 Xunit.Sdk.TestAssemblyRunner`1[[System.__Canon, System.Private.CoreLib]].RunAsync()
    PARAMETERS:
        this (0x00007FF7BFEFD3D0) = 0x000000019043cb58
    LOCALS:
        0x00007FF7BFEFD388 = 0x000000019043cb58

00007FF7BFEFD3F0 000000012ED77BDF Xunit.Sdk.XunitTestFrameworkExecutor+<RunTestCases>d__8.MoveNext() [/_/src/xunit.execution/Sdk/Frameworks/XunitTestFrameworkExecutor.cs @ 95]
    PARAMETERS:
        this (0x00007FF7BFEFD448) = 0x00007ff7bfefd528
    LOCALS:
        0x00007FF7BFEFD444 = 0x00000000ffffffff
        0x00007FF7BFEFD438 = 0x0000000190063668
        0x00007FF7BFEFD430 = 0x0000000000000000
        0x00007FF7BFEFD428 = 0x0000000000000000

00007FF7BFEFD460 000000012ED77A6E System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Xunit.Sdk.XunitTestFrameworkExecutor+<RunTestCases>d__8, xunit.execution.dotnet]](<RunTestCases>d__8 ByRef) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs @ 38]
    PARAMETERS:
        stateMachine (0x00007FF7BFEFD4D8) = 0x00007ff7bfefd528
    LOCALS:
        0x00007FF7BFEFD4D0 = 0x0000000190064118
        0x00007FF7BFEFD4C8 = 0x0000000000000000
        0x00007FF7BFEFD4C0 = 0x0000000000000000
        0x00007FF7BFEFD4B8 = 0x0000000000000000

00007FF7BFEFD4F0 000000012ED779DC System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start[[Xunit.Sdk.XunitTestFrameworkExecutor+<RunTestCases>d__8, xunit.execution.dotnet]](<RunTestCases>d__8 ByRef) [/Users/furt/github/wfurt-runtime2/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncVoidMethodBuilder.cs @ 40]
    PARAMETERS:
        this (0x00007FF7BFEFD4F8) = 0x00007ff7bfefd558
        stateMachine (0x00007FF7BFEFD4F0) = 0x00007ff7bfefd528

00007FF7BFEFD510 000000012ED7791A Xunit.Sdk.XunitTestFrameworkExecutor.RunTestCases(System.Collections.Generic.IEnumerable`1<Xunit.Sdk.IXunitTestCase>, Xunit.Abstractions.IMessageSink, Xunit.Abstractions.ITestFrameworkExecutionOptions)
    PARAMETERS:
        this (0x00007FF7BFEFD588) = 0x0000000190063668
        testCases (0x00007FF7BFEFD580) = 0x000000019043cb18
        executionMessageSink (0x00007FF7BFEFD578) = 0x000000019043ca40
        executionOptions (0x00007FF7BFEFD570) = 0x0000000190034ef8
    LOCALS:
        0x00007FF7BFEFD528 = 0x0000000190063668

00007FF7BFEFD5A0 000000012ED77869 Xunit.Sdk.TestFrameworkExecutor`1[[System.__Canon, System.Private.CoreLib]].RunTests(System.Collections.Generic.IEnumerable`1<Xunit.Abstractions.ITestCase>, Xunit.Abstractions.IMessageSink, Xunit.Abstractions.ITestFrameworkExecutionOptions) [/_/src/xunit.execution/Sdk/Frameworks/TestFrameworkExecutor.cs @ 100]
    PARAMETERS:
        this (0x00007FF7BFEFD5D0) = 0x0000000190063668
        testCases (0x00007FF7BFEFD5C8) = 0x0000000190393dd8
        executionMessageSink (0x00007FF7BFEFD5C0) = 0x000000019043ca40
        executionOptions (0x00007FF7BFEFD5B8) = 0x0000000190034ef8

00007FF7BFEFD5F0 000000012ED7776F Xunit.Xunit2.RunTests(System.Collections.Generic.IEnumerable`1<Xunit.Abstractions.ITestCase>, Xunit.Abstractions.IMessageSink, Xunit.Abstractions.ITestFrameworkExecutionOptions) [/_/src/xunit.runner.utility/Frameworks/v2/Xunit2.cs @ 110]
    PARAMETERS:
        this (0x00007FF7BFEFD618) = 0x00000001900504c8
        testCases (0x00007FF7BFEFD610) = 0x0000000190393dd8
        messageSink (0x00007FF7BFEFD608) = 0x000000019043bbc0
        executionOptions (0x00007FF7BFEFD600) = 0x0000000190034ef8

00007FF7BFEFD630 000000012E29C866 Xunit.ConsoleClient.ConsoleRunner.ExecuteAssembly(System.Object, Xunit.XunitProjectAssembly, Boolean, Boolean, System.Nullable`1<Boolean>, System.Nullable`1<Int32>, Boolean, Boolean, System.Nullable`1<Xunit.AppDomainSupport>, Boolean, Boolean, Xunit.XunitFilters, Boolean) [/_/src/Microsoft.DotNet.XUnitConsoleRunner/src/ConsoleRunner.cs @ 396]
    PARAMETERS:
        this (<CLR reg>) = 0x0000000190071720
        consoleLock = <no data>
        assembly (<CLR reg>) = 0x0000000190073268
        serialize = <no data>
        needsXml = <no data>
        parallelizeTestCollections = <no data>
        maxThreadCount = <no data>
        diagnosticMessages = <no data>
        noColor = <no data>
        appDomains = <no data>
        failSkips = <no data>
        stopOnFail (0x00007FF7BFEFD7E8) = 0x0000000000000000
        filters = <no data>
        internalDiagnosticMessages (0x00007FF7BFEFD7F8) = 0x0000000000000000
    LOCALS:
        0x00007FF7BFEFD748 = 0x0000000190034a18
        <no data>
        0x00007FF7BFEFD738 = 0x0000000190034ef8
        <no data>
        <no data>
        <no data>
        <no data>
        <no data>
        <no data>
        <no data>
        <no data>
        0x00007FF7BFEFD728 = 0x00000001901da158
        0x00007FF7BFEFD720 = 0x00000001900502c8
        0x00007FF7BFEFD718 = 0x00000001900503a0
        <no data>
        <no data>
        <no data>
        0x00007FF7BFEFD710 = 0x000000019043b860
        <no data>
        <no data>

00007FF7BFEFD7C0 000000012E298288 Xunit.ConsoleClient.ConsoleRunner.RunProject(Xunit.XunitProject, Boolean, System.Nullable`1<Boolean>, System.Nullable`1<Boolean>, System.Nullable`1<Int32>, Boolean, Boolean, System.Nullable`1<Xunit.AppDomainSupport>, Boolean, Boolean, Boolean) [/_/src/Microsoft.DotNet.XUnitConsoleRunner/src/ConsoleRunner.cs @ 293]
    PARAMETERS:
        this (0x00007FF7BFEFDAA0) = 0x0000000190071720
        project (0x00007FF7BFEFDA98) = 0x000000019002ad50
        serialize (0x00007FF7BFEFDA94) = 0x0000000000000000
        parallelizeAssemblies (0x00007FF7BFEFDA88) = 0x0000000000000001
        parallelizeTestCollections (0x00007FF7BFEFDA80) = 0x0000000100000001
        maxThreadCount (0x00007FF7BFEFDA78) = 0x0000000000000000
        diagnosticMessages (0x00007FF7BFEFDAE0) = 0x0000000000000000
        noColor (0x00007FF7BFEFDAE8) = 0x0000000000000001
        appDomains (0x00007FF7BFEFDAF0) = 0x0000000000000000
        failSkips (0x00007FF7BFEFDAF8) = 0x0000000000000000
        stopOnFail (0x00007FF7BFEFDB00) = 0x0000000000000000
        internalDiagnosticMessages (0x00007FF7BFEFDB08) = 0x0000000000000000
    LOCALS:
        0x00007FF7BFEFDA70 = 0x0000000190034438
        0x00007FF7BFEFDA68 = 0x0000000190034480
        0x00007FF7BFEFDA60 = 0x00000001900344e8
        0x00007FF7BFEFDA58 = 0x0000000190034890
        0x00007FF7BFEFDA50 = 0x0000000000000000
        0x00007FF7BFEFDA48 = 0x0000000000000000
        0x00007FF7BFEFDA40 = 0x0000000000000000
        0x00007FF7BFEFDA38 = 0x0000000000000000
        0x00007FF7BFEFDA30 = 0x0000000000000000
        0x00007FF7BFEFDA28 = 0x0000000190034960
        0x00007FF7BFEFDA20 = 0x0000000190073268
        0x00007FF7BFEFDA18 = 0x0000000000000000
        0x00007FF7BFEFDA10 = 0x0000000000000000

00007FF7BFEFDAE0 000000012E258C45 Xunit.ConsoleClient.ConsoleRunner.EntryPoint(System.String[]) [/_/src/Microsoft.DotNet.XUnitConsoleRunner/src/ConsoleRunner.cs @ 81]
    PARAMETERS:
        this (0x00007FF7BFEFDC18) = 0x0000000190071720
        args (0x00007FF7BFEFDC10) = 0x000000019000ef60
    LOCALS:
        0x00007FF7BFEFDC08 = 0x000000019002b8e0
        0x00007FF7BFEFDC00 = 0x0000000190032900
        0x00007FF7BFEFDBF8 = 0x000000019002bce0
        0x00007FF7BFEFDBF4 = 0x0000000000000000
        0x00007FF7BFEFDBF0 = 0x0000000000000000
        0x00007FF7BFEFDBE8 = 0x0000000000000000

00007FF7BFEFDC30 000000012DCC6AF9 Xunit.ConsoleClient.Program.Main(System.String[]) [/_/src/Microsoft.DotNet.XUnitConsoleRunner/src/Program.cs @ 16]
    PARAMETERS:
        args (0x00007FF7BFEFDC78) = 0x000000019000ef60
    LOCALS:
        0x00007FF7BFEFDC70 = 0x000000019000f930
        0x00007FF7BFEFDC68 = 0x000000019000f960
        0x00007FF7BFEFDC60 = 0x000000019000f9b8
        0x00007FF7BFEFDC5C = 0x0000000000000000

I'm not 100% sure if this is the same issue but I can provide more info if needed.

@wfurt, can we have the native stack?

this?

(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
  * frame #0: 0x0000000104664b33 libcoreclr.dylib`PAL_ThrowExceptionFromContext + 19
    frame #1: 0x000000010489e86e libcoreclr.dylib`UnwindManagedExceptionPass2(PAL_SEHException&, _CONTEXT*) + 990
    frame #2: 0x000000010489e9ed libcoreclr.dylib`UnwindManagedExceptionPass1(PAL_SEHException&, _CONTEXT*) + 349
    frame #3: 0x000000010489ed1e libcoreclr.dylib`DispatchManagedException(PAL_SEHException&, bool) + 78
    frame #4: 0x0000000104810781 libcoreclr.dylib`IL_Throw(Object*) + 481
    frame #5: 0x000000012efb57c2
    frame #6: 0x000000012efb56f2
    frame #7: 0x000000012efb2de5
    frame #8: 0x000000012efb2948
    frame #9: 0x000000012efb25fd
    frame #10: 0x000000012efb05ed
    frame #11: 0x0000000104952e81 libcoreclr.dylib`CallDescrWorkerInternal + 124
    frame #12: 0x00000001047b18cc libcoreclr.dylib`CallDescrWorkerWithHandler(CallDescrData*, int) + 92
    frame #13: 0x000000010485729b libcoreclr.dylib`RuntimeMethodHandle::InvokeMethod(Object*, void**, SignatureNative*, bool) + 1931
    frame #14: 0x000000012e28696d
    frame #15: 0x000000012e26e18f
    frame #16: 0x000000012e28537b
    frame #17: 0x000000012e285267
    frame #18: 0x000000012efb056c
    frame #19: 0x000000012efb018f
    frame #20: 0x000000012efafa09
    frame #21: 0x000000012efaf930
    frame #22: 0x000000012efaf8a6
    frame #23: 0x000000012efaf65e
    frame #24: 0x000000012efaf541
    frame #25: 0x000000012efaf4ac
    frame #26: 0x000000012efaf460
    frame #27: 0x000000012efaf3f3
    frame #28: 0x000000012efaf1b1
    frame #29: 0x000000012efaf0bb
    frame #30: 0x000000012efaf02c
    frame #31: 0x000000012efaefe1
    frame #32: 0x000000012efae86b
    frame #33: 0x000000012efae5bf
    frame #34: 0x000000012efae4e0
    frame #35: 0x000000012efae456
    frame #36: 0x000000012efae28a
    frame #37: 0x000000012efaccac
    frame #38: 0x000000012efac7f3
    frame #39: 0x000000012efac710
    frame #40: 0x000000012efac68b
    frame #41: 0x000000012efac42f
    frame #42: 0x000000012efac32b
    frame #43: 0x000000012efac29c
    frame #44: 0x000000012efac211
    frame #45: 0x000000012efac171
    frame #46: 0x000000012efabb4b
    frame #47: 0x000000012efab7bb
    frame #48: 0x000000012efab4e2
    frame #49: 0x000000012efab450
    frame #50: 0x000000012efab3fa
    frame #51: 0x000000012efab36a
    frame #52: 0x000000012efab018
    frame #53: 0x000000012efaaef9
    frame #54: 0x000000012efaae20
    frame #55: 0x000000012efaac41
    frame #56: 0x000000012efaa160
    frame #57: 0x000000012efa9d03
    frame #58: 0x000000012efa9c20
    frame #59: 0x000000012efa9b85
    frame #60: 0x000000012efa7ed6
    frame #61: 0x000000012efa781a
    frame #62: 0x000000012efa752f
    frame #63: 0x000000012efa7450
    frame #64: 0x000000012efa73bf
    frame #65: 0x000000012efa666b
    frame #66: 0x000000012efa6539
    frame #67: 0x000000012efa60d8
    frame #68: 0x000000012efa5e03
    frame #69: 0x000000012efa5d20
    frame #70: 0x000000012efa5c85
    frame #71: 0x000000012efa564c
    frame #72: 0x000000012efa5429
    frame #73: 0x000000012efa5350
    frame #74: 0x000000012efa52c0
    frame #75: 0x000000012efa4e6e
    frame #76: 0x000000012efa285c
    frame #77: 0x000000012efa17cd
    frame #78: 0x000000012efa1630
    frame #79: 0x000000012efa155f
    frame #80: 0x000000012ef9d712
    frame #81: 0x000000012ef9d3df
    frame #82: 0x000000012ef9d300
    frame #83: 0x000000012ef9d26f
    frame #84: 0x000000012ef9cd42
    frame #85: 0x000000012ef9c653
    frame #86: 0x000000012ef9b733
    frame #87: 0x000000012ef9b650
    frame #88: 0x000000012ef9b5b5
    frame #89: 0x000000012ef980f3
    frame #90: 0x000000012ef9734f
    frame #91: 0x000000012ef971a0
    frame #92: 0x000000012ef96acf
    frame #93: 0x000000012ef94f95
    frame #94: 0x000000012ef8e52e
    frame #95: 0x000000012ef8dc23
    frame #96: 0x000000012ef8da30
    frame #97: 0x000000012ef8d994
    frame #98: 0x000000012ef8d678
    frame #99: 0x000000012ef8c155
    frame #100: 0x000000012ef8b454
    frame #101: 0x000000012ef8b3b0
    frame #102: 0x000000012ef8b355
    frame #103: 0x000000012ed7883f
    frame #104: 0x000000012ed78468
    frame #105: 0x000000012ed78380
    frame #106: 0x000000012ed782a5
    frame #107: 0x000000012ed77bdf
    frame #108: 0x000000012ed77a6e
    frame #109: 0x000000012ed779dc
    frame #110: 0x000000012ed7791a
    frame #111: 0x000000012ed77869
    frame #112: 0x000000012ed7776f
    frame #113: 0x000000012e29c866
    frame #114: 0x000000012e298288
    frame #115: 0x000000012e258c45
    frame #116: 0x000000012dcc6af9
    frame #117: 0x0000000104952e81 libcoreclr.dylib`CallDescrWorkerInternal + 124
    frame #118: 0x00000001047b21e3 libcoreclr.dylib`MethodDescCallSite::CallTargetWorker(unsigned long long const*, unsigned long long*, int) + 1587
    frame #119: 0x00000001046ae076 libcoreclr.dylib`RunMain(MethodDesc*, short, int*, PtrArray**) + 742
    frame #120: 0x00000001046ae462 libcoreclr.dylib`Assembly::ExecuteMainMethod(PtrArray**, int) + 450
    frame #121: 0x00000001046d6f61 libcoreclr.dylib`CorHost2::ExecuteAssembly(unsigned int, char16_t const*, int, char16_t const**, unsigned int*) + 689
    frame #122: 0x000000010469b9b2 libcoreclr.dylib`coreclr_execute_assembly + 226
    frame #123: 0x0000000103198b84 libhostpolicy.dylib`coreclr_t::execute_assembly(int, char const**, char const*, unsigned int*) + 132
    frame #124: 0x00000001031ddf8d libhostpolicy.dylib`run_app_for_context(hostpolicy_context_t const&, int, char const**) + 1117
    frame #125: 0x00000001031de212 libhostpolicy.dylib`run_app(int, char const**) + 98
    frame #126: 0x00000001031dee72 libhostpolicy.dylib`corehost_main + 434
    frame #127: 0x0000000100557f0b libhostfxr.dylib`execute_app(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, corehost_init_t*, int, char const**) + 779
    frame #128: 0x000000010054fc50 libhostfxr.dylib`(anonymous namespace)::read_config_and_execute(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, host_startup_info_t const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, std::__1::unordered_map<known_options, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, known_options_hash, std::__1::equal_to<known_options>, std::__1::allocator<std::__1::pair<known_options const, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>>>> const&, int, char const**, host_mode_t, bool, char*, int, int*) + 272
    frame #129: 0x000000010054ca2a libhostfxr.dylib`fx_muxer_t::handle_exec_host_command(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, host_startup_info_t const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, std::__1::unordered_map<known_options, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>, known_options_hash, std::__1::equal_to<known_options>, std::__1::allocator<std::__1::pair<known_options const, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>>>>> const&, int, char const**, int, host_mode_t, bool, char*, int, int*) + 426
    frame #130: 0x000000010054bd87 libhostfxr.dylib`fx_muxer_t::execute(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, int, char const**, host_startup_info_t const&, char*, int, int*) + 423
    frame #131: 0x0000000100543a8e libhostfxr.dylib`hostfxr_main_startupinfo + 190
    frame #132: 0x0000000100011476 dotnet`exe_start(int, char const**) + 1446
    frame #133: 0x00000001000118a8 dotnet`main + 216
    frame #134: 0x00007ff80bdd141f dyld`start + 1903

I can reproduce while running under lldb. I'm working on binary search now to isolate breaking change.

@wfurt, yes, this is what I meant by native stack. This doesn't look like the GC issue we are investigating though, instead,this looks like a managed exception.

OK. The part I'm trying understand is what it would crash the whole test process. I tried several test suites and I get the same results. I could try the coreclr tests as well as Mac is my primary machine.

Any updates here? This bug is blocking our OSX testing as it results in a near 100% failure rate.

I wasn't actively working on it for the last few days. I am happy to if I can get myself some useful information that I use.

We've offered to change our repo to give any information possible. We are bound by the limits of Helix so full dumps aren't possible.

I wasn't actively working on it for the last few days

This is not very encouraging. There appears to be a runtime bug that blocks the compiler from executing correctly on one of our key operating systems.

We've offered to change our repo to give any information possible.

Is it possible to run the CI with an instrumented runtime that emit logs instead of dump files to workaround the limitation that dumps are unavailable?

Is it possible to run the CI with an instrumented runtime that emit logs instead of dump files to workaround the limitation that dumps are unavailable?

Yes. Is there a runtime available that is instrumented that we can use + instructions on how to use it?

Is it possible to run the CI with an instrumented runtime that emit logs instead of dump files to workaround the limitation that dumps are unavailable?

Yes. Is there a runtime available that is instrumented that we can use + instructions on how to use it?

There is none yet, but I can work on instrumenting it. Since we always crash on mark_ro_segment, we would like to know which line is failing there, it can be as easily as printf("line number\n"); between every line there. Assuming I am logging to stdout, will that information be captured?

Assuming I am logging to stdout, will that information be captured?

I think so. The stdout for xunit is captured in the logs so I would expect stdout in general to be captured. The dotnet test is a multi-process event which is why I have a slight bit of uncertainty.

I am working on the instrumentation now, when I am done, I will push a branch to my fork where I have the code changes. As of now, the changes are concentrated in gc.cpp, so it will suffice to just change the GC.

To make the managed process use the new GC, we need to build a libclrgc.dylib next to the loaded libcoreclr.dylib, and then set the environment variable DOTNET_GCName to libclrgc.dyilb, that should make the processes use the new GC.

For the first instrumentation round, all I really cared is the very tip of the log when it crashes. Should I worry about the possibility that multiple processes share the same stdout and the log could come from multiple processes?

To make the managed process use the new GC, we need to build a libclrgc.dylib next to the loaded libcoreclr.dylib, and then set the environment variable DOTNET_GCName to libclrgc.dyilb, that should make the processes use the new GC.

Let me know when you have it ready and I'll hack our build to use it.

Should I worry about the possibility that multiple processes share the same stdout and the log could come from multiple processes?

Think we'll have to just try and see for now.

I have got the instrumentation ready, can we try this branch?

https://github.com/cshung/runtime/tree/public/mark-ro-instrumentation

Don't worry about rebasing it, clrgc is meant to work across versions.

@cshung

How do we get an OSX dotnet host out of that repo? If you have one locally could you just share it out and I'll pubish it around.

@cshung

How do we get an OSX dotnet host out of that repo? If you have one locally could you just share it out and I'll pubish it around.

I am hoping it suffice to just replace the GC, we did quite some work in .net 6/7 time frame to make that possible. By just replacing the GC, we have better chance to reproduce the issue since none of the other things (e.g. vm/jit/libraries) are changed.

Are you hitting some issues with that? I maybe able to figure out what that is.

If you also wanted/needed to replace the dotnet host, then I am not sure how to do. @elinor-fung might know how.

dotnet host

Build the branch using ./build.sh -c release. The host will be dropped under artifacts/bin/osx-x64.Release/corehost.

As @cshung said, it should not be necessary. Dropping private libclrgc.dylib and setting env variable should be sufficient.

The problem is that our devs don't have OSX machines so building ourselves isn't going to help. Our OSX machine access is through CI only. That is why I was asking if you could share the built GC out and I can take it from there.

@cshung Can you queue draft PR with your change? It is the easiest way to get the instrumented GC binary built and shared.

@agocke was awesome enough to grab the most recent Roslyn failure bits from Helix, drop them on his Mac and run the tests in a loop for three hours. Eventually he got a full crash dump (compressed) for the problem. The dump should be accessible to anyone at Microsoft. Warning: it's 12GB.

Thanks @jaredpar and @agocke, I am trying to open the dump. I am able to download the dump and open it on a osx arm64 machine, but I can't extract useful information out of it.

Here is what I tried:

andrewau@boron dotnet % lldb ./dotnet --core ~/Desktop/core\ -\ Copy.97526
(lldb) target create "./dotnet" --core "/Users/andrewau/Desktop/core - Copy.97526"
Core file '/Users/andrewau/Desktop/core - Copy.97526' (arm64) was loaded.
(lldb) bt
* thread #10, stop reason = ESR_EC_DABORT_EL0 (fault address: 0x1187ce2e8)
  * frame #0: 0x00000001061338f8
(lldb) bt all
  thread #1
    frame #0: 0x00007ff8a45d6a78
  thread #2
    frame #0: 0x00007ff7ffdd3294
    frame #1: 0x00007ff7ffddf524
    frame #2: 0x00007ff7ffde0e40
  thread #3
    frame #0: 0x00007ff8a45d6a78
  thread #4
    frame #0: 0x00007ff8a45d6a78
  thread #5
    frame #0: 0x00007ff8a45d6a78
  thread #6
    frame #0: 0x00007ff8a45d6a78
  thread #7
    frame #0: 0x00007ff8a45d6a78
  thread #8
    frame #0: 0x00007ff8a45d6a78
  thread #9
    frame #0: 0x00007ff8a45d6a78
* thread #10, stop reason = ESR_EC_DABORT_EL0 (fault address: 0x1187ce2e8)
  * frame #0: 0x00000001061338f8
  thread #11
    frame #0: 0x00007ff8a45d6a78
  thread #12
    frame #0: 0x00007ff8a45d6a78
  thread #13
    frame #0: 0x00007ff8a45d6a78
  thread #14
    frame #0: 0x00007ff8a45d6a78
  thread #15
    frame #0: 0x00007ff8a45d6a78
  thread #16
    frame #0: 0x00007ff8a45d6a78
  thread #17
    frame #0: 0x00007ff8a45d6a78
  thread #18
    frame #0: 0x00007ff8a45d6a78
  thread #19
    frame #0: 0x00007ff8a45d6a78
  thread #20
    frame #0: 0x00007ff8a45d6a78
  thread #21
    frame #0: 0x00007ff8a45d6a78
  thread #22
    frame #0: 0x00007ff8a45d6a78
  thread #23
    frame #0: 0x00007ff8a45d6a78
  thread #24
    frame #0: 0x00007ff8a45d6a78
  thread #25
    frame #0: 0x00007ff8a45d6a78
  thread #26
    frame #0: 0x00007ff8a45d6a78
  thread #27
    frame #0: 0x00007ff8a45d6a78
(lldb) target modules list
[  0] 2026C5B3-94DF-38EC-9053-6CF87776BE3E 0x0000000100000000 /Users/andrewau/toolssw/dotnet/dotnet 
[  1] 324E4AD9-E01F-3183-B09F-3E20B326643A 0x00000001800b7000 /usr/lib/dyld 
[  2] 375254EB-5A65-35D0-B6B4-773E6763D289 0x0000000180352000 /usr/lib/libc++.1.dylib 
[  3] C9A4714E-2961-3FBD-8E74-8615B3A5777E 0x000000018cccd000 /usr/lib/libSystem.B.dylib 
[  4] E812122A-DA5B-3F1A-A15C-936C0B9D26BE 0x00000001803e0000 /usr/lib/libc++abi.dylib 
[  5] B0558732-E048-33CE-A6D7-2EC929BFCA1D 0x000000018ccc7000 /usr/lib/system/libcache.dylib 
[  6] 1A4B497A-69D2-3048-8F47-133482DABAFA 0x000000018cc82000 /usr/lib/system/libcommonCrypto.dylib 
[  7] DE627B59-A9DD-30C5-8F6D-BEF3949C64A1 0x000000018ccae000 /usr/lib/system/libcompiler_rt.dylib 
[  8] 11CC75EB-6597-33C6-B725-607F7E0B0A28 0x000000018cca4000 /usr/lib/system/libcopyfile.dylib 
[  9] 61DEF451-18FC-3FA7-B05A-F80B0BF36404 0x00000001801b3000 /usr/lib/system/libcorecrypto.dylib 
[ 10] A53D555D-F748-3010-83FE-385C660A81BD 0x0000000180289000 /usr/lib/system/libdispatch.dylib 
[ 11] 33108EF5-2DC1-3E6D-B3BE-C55520E1594F 0x0000000180444000 /usr/lib/system/libdyld.dylib 
[ 12] FCB5DECB-A48D-3B82-9E12-03F2AFA3B0F9 0x000000018ccbd000 /usr/lib/system/libkeymgr.dylib 
[ 13] 8C3F607B-5FA9-3C80-AC97-66F2BBCF2F85 0x000000018cc5a000 /usr/lib/system/libmacho.dylib 
[ 14] 9A7AD27E-0ECF-3D69-AD56-4C41E0AC19DE 0x000000018c1f3000 /usr/lib/system/libquarantine.dylib 
[ 15] DE28FFB5-D896-38E2-B585-E9847A7918C3 0x000000018ccba000 /usr/lib/system/libremovefile.dylib 
[ 16] 092396DB-281D-3FA0-9E50-43F0B11AA972 0x0000000185b0e000 /usr/lib/system/libsystem_asl.dylib 
[ 17] 41DD58AD-E581-3BC7-A2C4-314046BA471F 0x000000018014c000 /usr/lib/system/libsystem_blocks.dylib 
[ 18] AB8A0A0B-9A1E-3284-9243-5A0334468AE5 0x00000001802d3000 /usr/lib/system/libsystem_c.dylib 
[ 19] 15F74475-A05D-333E-85B8-8BCFF0170FAC 0x000000018ccb2000 /usr/lib/system/libsystem_collections.dylib 
[ 20] 136CD597-BE32-3806-8C7E-B144FCC956C6 0x000000018b4ce000 /usr/lib/system/libsystem_configuration.dylib 
[ 21] 9176BF94-EF84-3C52-93FD-7014FD23E850 0x000000018a54e000 /usr/lib/system/libsystem_containermanager.dylib 
[ 22] 9DF87415-44A0-31F3-BC0B-BFBC6D5BFC2B 0x000000018c8f9000 /usr/lib/system/libsystem_coreservices.dylib 
[ 23] A7805817-0D12-3663-8B9B-EE13AA69A1C4 0x00000001837e2000 /usr/lib/system/libsystem_darwin.dylib 
[ 24] 458D27F4-5C6F-312C-A552-437FE7B0F705 0x00000002217ba000 /usr/lib/system/libsystem_darwindirectory.dylib 
[ 25] 4FCBB463-F915-38A4-AB32-159AF74479E9 0x000000018ccbe000 /usr/lib/system/libsystem_dnssd.dylib 
[ 26] E361D92B-A13D-3278-A67E-059BCC1A1942 0x00000001802d0000 /usr/lib/system/libsystem_featureflags.dylib 
[ 27] 0B3340BE-7CBE-356F-9ACE-7A062DC0554E 0x0000000180471000 /usr/lib/system/libsystem_info.dylib 
[ 28] DBAEE968-94BC-390A-9277-2F0D6696F804 0x000000018cc1f000 /usr/lib/system/libsystem_m.dylib 
[ 29] 690A8B04-8E64-3332-B5A5-56A3D5C1C43F 0x0000000180252000 /usr/lib/system/libsystem_malloc.dylib 
[ 30] DB1022B7-FDD1-3045-A287-3149C1B3D7DA 0x0000000185a7e000 /usr/lib/system/libsystem_networkextension.dylib 
[ 31] 60ECA172-D5DA-3743-AE08-2E397A8C7754 0x0000000183c55000 /usr/lib/system/libsystem_notify.dylib 
[ 32] 5F138857-5FE4-30BE-8B63-FDD645DF23A1 0x000000018b4d3000 /usr/lib/system/libsystem_sandbox.dylib 
[ 33] C2EA7F93-A263-39A2-BCDC-F26DCE9DFA32 0x000000018ccb7000 /usr/lib/system/libsystem_secinit.dylib 
[ 34] CA94FC21-BC40-3B43-B65D-B87ECE9E1D48 0x00000001803fc000 /usr/lib/system/libsystem_kernel.dylib 
[ 35] E1840DAA-9C10-393D-A3A3-94DDE6FE0011 0x000000018046a000 /usr/lib/system/libsystem_platform.dylib 
[ 36] A7D94C96-7B1F-3229-9BEA-048D037C3292 0x0000000180437000 /usr/lib/system/libsystem_pthread.dylib 
[ 37] 16E4B671-D97C-3908-9127-307A83DF3DCD 0x00000001874e3000 /usr/lib/system/libsystem_symptoms.dylib 
[ 38] 1F45FD2F-3ABC-3AB3-9A6F-CC9C727ACBDA 0x0000000180198000 /usr/lib/system/libsystem_trace.dylib 
[ 39] 0C443A31-8851-30E2-9FAD-B4C7633F5135 0x000000018cc90000 /usr/lib/system/libunwind.dylib 
[ 40] 272DC84F-1871-3ADD-8126-2155D6EFF7AB 0x0000000180151000 /usr/lib/system/libxpc.dylib 
[ 41] 9BAB9556-7A2A-30A8-ACDE-010BA8E2367D 0x0000000180068000 /usr/lib/libobjc.A.dylib 
[ 42] B4164258-BFB1-3871-A2E2-528C373AEF77 0x000000018cc9c000 /usr/lib/liboah.dylib

It looks like the stack unwind is failing because we don't have symbols for libcoreclr.dylib, and it is not even listed on the module list, am I missing something like matching binaries or symbols?

Feel free to reach out to @hoyosjs for instructions on debugging on Mac

Was this done on emulation? I see rosetta loaded and we don't support dumps using emulation. However, the dump and runtime in it are arm64, so I am confused. And how was this dump collected? Overall, the dump seems to be in a pretty bad state.

@hoyosjs confirmed with me that the second dump is unfortunately unusable. We might be able to get some info from the 1st dump though. I will work with him on that.

Regardless, can we run the instrumented bits? It is quite likely that I will need to know why a bad frozen segment get into the heap to begin with, and that cannot be solved by the dump because the crime scene is long gone for that and logging will be the preferred method for debugging.

@cshung

Regardless, can we run the instrumented bits?

Sure thing. Was hoping the dump file would be enough. If it's not though I can queue up the instrumented GC.

Pipeline Run

Pipeline Run

Thank you! It looks like the run is completed, but the only failure is "Validate Generated Syntax Files" failing with a "The system cannot find the path specified." on Windows?

@cshung Yes. I've re-run it a few times and it's passing every time. Worried whatever timing issues exists is essentially undone by adding printf into the code. Trying a few more runs.

Is there some way we can observe that the new GC is actually in use in the pipeline? I am going through the log but I can't see any of the logging statement, or did we just skip the log if the tests pass?

Is there some way we can observe that the new GC is actually in use in the pipeline?

I don't know ... can we? 😄

I am going through the log but I can't see any of the logging statement, or did we just skip the log if the tests pass?

The log is not easy to find when tests pass. Have to start digging through the Helix API directly to find it. J

Tracked down the console log and it does seem like something is going sideways here. Our mac logic which was working one week ago is now no longer hitting. Yay infra. Digging into it.

Just a link for easy access. https://github.com/dotnet/roslyn/pull/71724

can this be closed now since this hasn't reproed in a while?

Yeah. Can re-open if we see it again.

I think this happens regularly in roslyn-CI main runs - all these red circles are failing macOS legs:

@cshung, do you still have the private with logging which you had built to diagnose these?

@cshung, do you still have the private with logging which you had built to diagnose these?

Yes, the instrumentation branch is still there

Is there any update on the investigation here? Have we been able to run with instrumentation enabled?

This actually stopped happening when roslyn was updated from .NET 8 to .NET 9 SDK in https://github.com/dotnet/roslyn/pull/73408.

dotnet / runtime