[ci-scan] Test failure: ComWrappersTests.ValidateExternalWrapperCacheCleanUpWithoutFinalizer under GCStress

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584365
Build error leg or test failing: coreclr Pri1 Runtime Tests Run linux x64 checked (gcstress) - Interop.0.1 / ComWrappersTests

KBE authoring guidance (ci-failure-scan)

• Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
• Build Analysis parses only the single JSON block under Error Message.
• ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
• Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.

Error Details

Failed test: Interop/COM/ComWrappers/API/ComWrappersTests/ComWrappersTests.cmd

Xunit.Sdk.TrueException: Assert.True() Failure
Expected: True
Actual:   False
   at ComWrappersTests.Program.<ValidateExternalWrapperCacheCleanUpWithoutFinalizer>g__AssertUsableAndDrop|31_0(WeakReference`1 reference)
   at ComWrappersTests.Program.ValidateExternalWrapperCacheCleanUpWithoutFinalizer()
   at Xunit.Assert.True(Nullable`1 condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 135

This ComWrappers external-wrapper cache-cleanup test fails under GCStress (runtime-coreclr gcstress-gcstress, def 112). It first appeared in build 1584365 (2026-09-05) after a run of passing builds and reproduced in follow-up build 1584861 (2026-09-06) across multiple OS/arch legs, so it is a stable regression rather than infra noise.

Error Message

{
  "ErrorMessage": [
    "Failed test: Interop/COM/ComWrappers/API/ComWrappersTests/ComWrappersTests.cmd",
    "at ComWrappersTests.Program.ValidateExternalWrapperCacheCleanUpWithoutFinalizer()"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

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

Note

This issue was generated by an AI/Copilot agent (ci-failure-scan workflow).

Generated by CI Outer-Loop Failure Scanner · opus48 · 990.4 AIC · ⌖ 18.2 AIC · ⊞ 20.7K · ◷

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Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

[jkotas]

Duplicate of #133331