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Failed test: GC/API/GC/GetGeneration/GetGeneration.dll #131542

Closed
#131816
Closed
Failed test: GC/API/GC/GetGeneration/GetGeneration.dll#131542
#131816
Assignees
BrzVladcopilot-swe-agent
Labels
Known Build ErrorUse this to report build issues in the .NET Helix tabarea-CodeGen-Interpreter-coreclrblocking-clean-ci-optionalBlocking optional rolling runs
Milestone
12.0.0

Description

@JulieLeeMSFT
JulieLeeMSFT
opened on Jul 29, 2026

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531411
Build error leg or test failing: GC/API/GC/GetGeneration/GetGeneration.dll

  • Massive failures in many configs
14:46:12.949 Running test: GC/API/GC/GetGeneration/GetGeneration.dll
0 0
ObjectTest Failed!
0 0
arrayTest Failed!
failTest Passed!

Test for GetGeneration() FAILED!
Xunit.Sdk.EqualException: Assert.Equal() Failure: Values differ
Expected: 100
Actual:   1
   at Xunit.Assert.Equal[T](T expected, T actual, IEqualityComparer`1 comparer) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs:line 102
   at Xunit.Assert.Equal[T](T expected, T actual) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs:line 36
   at Program.<<Main>$>g__TestExecutor28|0_29(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "Failed test: GC/API/GC/GetGeneration/GetGeneration.dll",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531411
Error message validated: [Failed test: GC/API/GC/GetGeneration/GetGeneration.dll]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/29/2026 5:40:38 PM UTC

Report

Build Repository Test Pull Request
1538649 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll #131754
1537295 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll
1536715 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll
1534710 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll
1533324 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll
1533254 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll #131590
1532391 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll #131027
1531411 dotnet/runtime GC/API/GC/GetGeneration/GetGeneration.dll

Summary

24-Hour Hit Count 7-Day Hit Count 1-Month Count
2 8 8

Activity

  1. JulieLeeMSFT
    added
    Known Build ErrorUse this to report build issues in the .NET Helix tab
    on Jul 29, 2026
  2. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Jul 29, 2026
  3. github-actions
    added
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    on Jul 29, 2026

  4. dotnet-policy-service commented on Jul 29, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Jul 29, 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.

  5. JulieLeeMSFT commented on Jul 29, 2026

    @JulieLeeMSFT
    JulieLeeMSFT
    on Jul 29, 2026
    MemberAuthor

    GC tests are failing in runtime-interpreter. cc @davidwrighton, if it's related to your recent change.

  6. JulieLeeMSFT
    added
    blocking-clean-ci-optionalBlocking optional rolling runs
    area-GC-coreclr
    and removed
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    on Jul 29, 2026
  7. github-project-automation
    added this to AppModelon Jul 29, 2026

  8. dotnet-policy-service commented on Jul 29, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Jul 29, 2026 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @anicka-net, @dotnet/gc
    See info in area-owners.md if you want to be subscribed.

  9. janvorli commented on Jul 29, 2026

    @janvorli
    janvorli
    on Jul 29, 2026
    Member

    This test has been always failing on my local machine. I am actually surprised it wasn't failing in the CI bewfore.

  10. JulieLeeMSFT
    added
    blocking-outerloopBlocking the 'runtime-coreclr outerloop' and 'runtime-libraries-coreclr outerloop' runs
    and removed
    blocking-outerloopBlocking the 'runtime-coreclr outerloop' and 'runtime-libraries-coreclr outerloop' runs
    on Jul 30, 2026

  11. janvorli commented on Jul 30, 2026

    @janvorli
    janvorli
    on Jul 30, 2026
    Member

    The test expects that a generation of a freshly created object will grow after GC.Collect() call and with interpreter it doesn't. I have verified that the local holding the object is reported to GC. It is reported as pinned, so I guess that might cause a demotion. I am looking into it to make sure it is not a bug.

  12. janvorli commented on Jul 31, 2026

    @janvorli
    janvorli
    on Jul 31, 2026
    Member

    I've debugged it. It is an interpreter incompatibility. The thing is that when interpreted code reports the local that we check the generation for, the GC info marks that local intentionally as pinned. GC then due to this decides to demote the object back to generation 0. But the test expects that after a GC.Collect, it would get higher generation.

  13. 1 remaining item

  14. BrzVlad
    removed
    untriagedNew issue has not been triaged by the area owner
    on Aug 3, 2026
  15. BrzVlad
    added this to the 12.0.0 milestone on Aug 3, 2026
  16. BrzVlad
    added
    area-CodeGen-Interpreter-coreclr
    and removed
    area-GC-coreclr
    on Aug 3, 2026

  17. dotnet-policy-service commented on Aug 3, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Aug 3, 2026 – with Dotnet Policy Service
    Contributor

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

  18. janvorli commented on Aug 3, 2026

    @janvorli
    janvorli
    on Aug 3, 2026
    Member

    Right.

  19. jkotas
    marked [ci-scan] Test failure: GC/API/GC/GetGeneration/GetGeneration.dll fails under interpreter on osx-arm64 #131743 as a duplicate of this issue on Aug 3, 2026

  20. JulieLeeMSFT commented on Aug 4, 2026

    @JulieLeeMSFT
    JulieLeeMSFT
    on Aug 4, 2026
    MemberAuthor

    @BrzVlad, @janvorli, this test is failing heavily. I see that the fix is planned for .NET 12. Meanwhile, can you please disable the test?

  21. BrzVlad commented on Aug 4, 2026

    @BrzVlad
    BrzVlad
    on Aug 4, 2026
    Member

    @copilot Disable this test via InterpreterIncompatible

  22. BrzVlad
    assigned
    Copilot
    and
    BrzVlad
    on Aug 4, 2026
  23. Copilot
    linked a pull request that will close this issueDisable GetGeneration test under interpreter (InterpreterIncompatible) #131816on Aug 4, 2026
  24. BrzVlad
    added a commit that references this issue on Aug 5, 2026

    Disable GetGeneration test under interpreter (InterpreterIncompatible) (

    c8f9797
  25. BrzVlad
    closed this as completedin #131816on Aug 5, 2026
  26. github-actions
    locked and limited conversation to collaborators on Sep 4, 2026
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