[ci-scan] Test failure: System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackOverflow_PreservesFullDepth o [Content truncated due to length]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592661 Build error leg or test failing: osx-arm64 Release NoDynamicCodeCompiled-System.Threading.Tasks.Tests

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Error Details

System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackOverflow_PreservesFullDepth [FAIL]
      Assert.Equal() Failure: Values differ
      Expected: 255
      Actual:   153
      ----- BEGIN ASYNC EVENTS (CSV) -----
      seq,delta,thread,event,disp,parent,frames,unwind
      ...
        /_/src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/System.Runtime.CompilerServices/AsyncProfilerV1Tests.cs(1574,0): at System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackOverflow_PreservesFullDepth()

AsyncProfilerTests.StateMachineAsync_CallstackOverflow_PreservesFullDepth fails on the osx-arm64 Release NoDynamicCodeCompiled leg of runtime-libraries-interpreter. The async-callstack profiler resume events report a truncated frame depth (Actual: 153) where the full depth (Expected: 255) is required, so Assert.Equal() fails. Reproduced in build 1592661 (2026-09-11) and still failing in build 1595619 (2026-09-14).

Error Message

{
  "ErrorMessage": [
    "System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackOverflow_PreservesFullDepth [FAIL]",
    "Assert.Equal() Failure: Values differ",
    "Expected: 255",
    "Actual:   153"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Workflow artifact: ci-failure-scan Artifact kind: kbe-verification Verified match count: 1 hits in failure.log

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

[!NOTE] This issue was generated by the ci-failure-scan Copilot agentic workflow.

Generated by CI Outer-Loop Failure Scanner · opus48 · 1K AIC · ⌖ 19.8 AIC · ⊞ 19.7K · ◷

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