[ci-scan] Test failure: GeneratorRun_WithNewCompilation_DoesNotKeepOldCompilationAlive in runtime-libraries-interpreter

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1440781
Build error leg or test failing: osx-arm64 Release - LibraryImportGenerator.Unit.Tests

Error Details

LibraryImportGenerator.UnitTests.IncrementalGenerationTests.GeneratorRun_WithNewCompilation_DoesNotKeepOldCompilationAlive(source: "using System.Runtime.InteropServices;\n\npartial c"...) [FAIL]
      Assert.False() Failure
      Expected: False
      Actual:   True
      Stack Trace:
        /_/src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.UnitTests/IncrementalGenerationTests.cs(233,0): at LibraryImportGenerator.UnitTests.IncrementalGenerationTests.GeneratorRun_WithNewCompilation_DoesNotKeepOldCompilationAlive(String source)
        /_/src/coreclr/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.CoreCLR.cs(37,0): at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)

Error Message

true only for clear infra flakes. ExcludeConsoleLog skips helix log scanning. -->

{
  "ErrorMessage": ["DoesNotKeepOldCompilationAlive", "Assert.False() Failure"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Additional context

• Pipeline: runtime-libraries-interpreter (definition 330)
• Platforms: osx-arm64, linux-x64 (observed on both)
• Test: LibraryImportGenerator.UnitTests.IncrementalGenerationTests.GeneratorRun_WithNewCompilation_DoesNotKeepOldCompilationAlive
• The test checks that old Roslyn compilations are not kept alive (weak reference becomes null). Under the interpreter, GC collection timing differs, causing the weak reference to remain alive.
• Previously filed as GeneratorRun_WithNewCompilation_DoesNotKeepOldCompilationAlive failed in CI #76826 (closed 2022-10-10). This is a recurrence under the newer runtime-libraries-interpreter pipeline.

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1440781
• Finished: 2026-05-29T15:59:29Z
• Occurrences in window: 2+ (persistent in both source and follow-up builds across platforms)
• Computed within the scanned window; may not be the true origin.

---

Filed by ci-failure-scan, which scans dnceng-public outer-loop pipelines on main and converts stable failures into KBEs and test-disable PRs. Comment here or on the workflow file to suggest changes; ci-failure-scan-feedback reads in-scope feedback daily and opens (or updates) a PR with prompt edits.

Generated by CI Outer-Loop Failure Scanner · ● 85.3M · ◷

Report

Summary

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

[dotnet-policy-service]

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