[ci-scan] Test failure: COM Dynamic finalizer double-unadvises connection point

[awakecoding]

Important

The submitting account does not have permission to apply upstream labels. The area label was assigned automatically; a maintainer still needs to add Known Build Error, blocking-clean-ci, os-windows, and arch-x64 for Build Analysis to recognize this issue.

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1573972
Build error leg or test failing: coreclr windows x64 Checked no_tiered_compilation @ Windows.Amd64.Open.rt - Interop/COM/Dynamic/Dynamic/Dynamic.cmd
Pull request: #132922

KBE authoring guidance (ci-failure-scan)

• Error Details is for readers. The exception and stack trace below are copied from the Helix console 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.
• BuildRetry is false because this is a product/test cleanup race rather than an infrastructure failure.
• ExcludeConsoleLog is false because the assertion is present in the Helix console log.

Error Details

Process terminated.
Assertion failed.
Can not unadvise from empty connection point
   at System.Runtime.InteropServices.ComEventsSink.Unadvise() in /_/src/libraries/Common/src/System/Runtime/InteropServices/ComEventsSink.cs:line 261
   at System.Runtime.InteropServices.ComEventsSink.RemoveAll(ComEventsSink sinks) in /_/src/libraries/Common/src/System/Runtime/InteropServices/ComEventsSink.cs:line 50
   at Microsoft.CSharp.RuntimeBinder.ComInterop.ComEventSinksContainer.DisposeAll() in /_/src/libraries/Microsoft.CSharp/src/Microsoft/CSharp/RuntimeBinder/ComInterop/ComEventSinksContainer.cs:line 65
   at Microsoft.CSharp.RuntimeBinder.ComInterop.ComEventSinksContainer.Finalize() in /_/src/libraries/Microsoft.CSharp/src/Microsoft/CSharp/RuntimeBinder/ComInterop/ComEventSinksContainer.cs:line 71
   at System.GC.RunFinalizers()

The finalizer attempted to call RemoveAll after the event sink had already been unadvised. Build Analysis reports a 0.03% failure rate for this test. The PR that encountered the failure changes NativeAOT/ReadyToRun dependency-analysis tooling and does not modify the runtime, Microsoft.CSharp COM binder, or this test.

Error Message

{
  "ErrorMessage": "Can not unadvise from empty connection point",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 2 hits in failure.log

Note

This issue draft was prepared with GitHub Copilot assistance and reviewed before submission.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573972
Error message validated: [Can not unadvise from empty connection point]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/31/2026 6:08:08 AM UTC

Report

Build	Repository	Test	Pull Request
1575374	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132978
1575079	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132969
1575058	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132970
1574847	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132962
1574822	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132787
1574762	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132965
1574742	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#131877
1574661	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132689
1574647	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132963
1574588	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132958
1574574	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132962
1574571	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132592
1574555	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132821
1574299	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132735
1573972	dotnet/runtime	Interop/COM/Dynamic/Dynamic/Dynamic.cmd	#132922

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
14	15	15

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