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System.AccessViolationException in System.Threading.Tasks.Tests Work Item #130595

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System.AccessViolationException in System.Threading.Tasks.Tests Work Item#130595
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JitStressCLR JIT issues involving JIT internal stress modesarea-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIblocking-clean-ci-optionalBlocking optional rolling runs

Description

@VincentBu
VincentBu
opened on Jul 13, 2026

Failed in: runtime-coreclr libraries-jitstress2-jitstressregs 20260711.1

Failed tests:

net11.0-windows-Release-arm64-jitstress2_jitstressregs0x80-Windows.11.Arm64.Open
- System.Threading.Tasks.Tests Work Item

Error message:

Fatal error.

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Stack trace:

   at System.Threading.Tasks.Tests.AsyncProfilerTests+<>c__DisplayClass84_0.<CollectEventsAsync>b__0()

   at System.Runtime.CompilerServices.AsyncProfiler+ContinuationWrapper.Continuation_Wrapper_1(System.Runtime.CompilerServices.Continuation, Byte ByRef)

Repeated 2 times:

--------------------------------

   at System.Runtime.CompilerServices.AsyncHelpers+RuntimeAsyncTask`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].InstrumentedDispatchContinuations(Flags)

   at System.Runtime.CompilerServices.AsyncHelpers+RuntimeAsyncTask`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].DispatchContinuations()

   at System.Threading.Tasks.Task.RunContinuations(System.Object)

   at System.Threading.Tasks.Task`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TrySetResult(System.Threading.Tasks.VoidTaskResult)

--------------------------------

   at System.Runtime.CompilerServices.AsyncHelpers+RuntimeAsyncTask`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].InstrumentedDispatchContinuations(Flags)

   at System.Runtime.CompilerServices.AsyncHelpers+RuntimeAsyncTask`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].DispatchContinuations()

   at System.Threading.ThreadPoolWorkQueue.Dispatch()

   at System.Threading.PortableThreadPool+WorkerThread.WorkerDoWork(System.Threading.PortableThreadPool)

   at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()

   at System.Threading.Thread.StartCallback(System.Threading.Thread*)

Activity

  1. VincentBu
    added
    JitStressCLR JIT issues involving JIT internal stress modes
    blocking-clean-ci-optionalBlocking optional rolling runs
    on Jul 13, 2026
  2. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Jul 13, 2026
  3. github-actions
    added
    area-System.Threading
    on Jul 13, 2026

  4. dotnet-policy-service commented on Jul 13, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Jul 13, 2026 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @JulieLeeMSFT, @VSadov
    See info in area-owners.md if you want to be subscribed.

  5. jkotas
    added
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    and removed
    area-System.Threading
    on Jul 13, 2026

  6. dotnet-policy-service commented on Jul 13, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Jul 13, 2026 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
    See info in area-owners.md if you want to be subscribed.

  7. jakobbotsch commented on Jul 13, 2026

    @jakobbotsch
    jakobbotsch
    on Jul 13, 2026
    Member

    I suspect this was fixed already via #130536.

  8. jakobbotsch commented on Jul 14, 2026

    @jakobbotsch
    jakobbotsch
    on Jul 14, 2026
    Member

    Looked at the dump and the crash is right around the same code as in #130212:

    00007fff`2bbc4558 17ffffd0 b           System_Threading_Tasks_Tests!System.Threading.Tasks.Tests.AsyncProfilerTests+<>c__DisplayClass84_0.<CollectEventsAsync>b__0()+0xa0 (00007fff`2bbc4498)
00007fff`2bbc455c f94077a3 ldr         x3,[fp,#0xE8]
>>> 00007fff`2bbc4560 b9401064 ldr         w4,[x3,#0x10]
00007fff`2bbc4564 35000184 cbnz        w4,System_Threading_Tasks_Tests!System.Threading.Tasks.Tests.AsyncProfilerTests+<>c__DisplayClass84_0.<CollectEventsAsync>b__0()+0x19c (00007fff`2bbc4594)
00007fff`2bbc4568 d2824400 mov         x0,#0x1220
00007fff`2bbc456c f2a22960 movk        x0,#0x114B,lsl #0x10
00007fff`2bbc4570 f2c040c0 movk        x0,#0x206,lsl #0x20 ("The runtime should have initialized the thread id by now.")
00007fff`2bbc4574 d2800101 mov         x1,#8

    Indeed I validated with Copilot that we CSE'd the thread base and reloaded it from the continuation.

  9. jakobbotsch
    closed this as completedon Jul 14, 2026
  10. dotnet-policy-service
    removed
    untriagedNew issue has not been triaged by the area owner
    on Jul 14, 2026
  11. github-actions
    locked and limited conversation to collaborators on Aug 13, 2026
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