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Test Failure: System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization #133121

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Test Failure: System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization#133121
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JulieLeeMSFT
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JitStressCLR JIT issues involving JIT internal stress modesKnown Build ErrorUse this to report build issues in the .NET Helix tabarea-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIblocking-clean-ci-optionalBlocking optional rolling runs
Milestone
12.0.0

Description

@JulieLeeMSFT
JulieLeeMSFT
opened on Sep 2, 2026

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826
Build error leg or test failing: System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization

Error Message

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

{
  "ErrorPattern": "System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization*",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826
Error message validated: [System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization*]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/2/2026 7:12:02 PM UTC

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1573826
Error message validated: [System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization*]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/2/2026 7:12:09 PM UTC

Report

Build Repository Test Pull Request
1657565 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization
1653872 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization
1650408 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync
1647905 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync
1646487 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync
1644999 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync
1639101 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync
1637864 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync
1630719 dotnet/runtime System.IO.Tests.FileStream_Dispose.DerivedFileStreamDisposeSuppressesStrategyFinalizationAsync
1630677 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization
1629329 dotnet/runtime System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization

Summary

24-Hour Hit Count 7-Day Hit Count 1-Month Count
0 1 11

Activity

  1. JulieLeeMSFT
    added
    Known Build ErrorUse this to report build issues in the .NET Helix tab
    on Sep 2, 2026
  2. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Sep 2, 2026
  3. github-actions
    added
    area-System.IO
    on Sep 2, 2026

  4. dotnet-policy-service commented on Sep 2, 2026

    @dotnet-policy-service
    dotnet-policy-serviceBot
    on Sep 2, 2026 – with Dotnet Policy Service
    Contributor

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

  5. JulieLeeMSFT
    added
    blocking-clean-ci-optionalBlocking optional rolling runs
    on Sep 2, 2026
  6. jeffhandley
    removed
    untriagedNew issue has not been triaged by the area owner
    blocking-clean-ci-optionalBlocking optional rolling runs
    on Sep 9, 2026
  7. jeffhandley
    added this to the Future milestone on Sep 9, 2026
  8. VincentBu
    added
    blocking-clean-ci-optionalBlocking optional rolling runs
    on Oct 14, 2026

  9. VincentBu commented on Oct 14, 2026

    @VincentBu
    VincentBu
    on Oct 14, 2026
    Contributor

    Failed in: runtime-coreclr libraries-jitstress20261013.1

    Failed tests:

    net11.0-windows-Release-x86-jitstress2_tiered-Windows.10.Amd64.Open
- System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync(bufferSize: 1, options: None)
- System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync(bufferSize: 1, options: Asynchronous)

System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization
- System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization(bufferSize: 1, options: None)
- System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization(bufferSize: 1, options: Asynchronous)

    Error message:

    Assert.False() Failure\r\nExpected: False\r\nActual:   True

    Stack trace:

    at System.IO.Tests.FileStream_Dispose.VerifyStrategyFinalization(Func`1 factory, Boolean useAsync) in /_/src/libraries/System.Runtime/tests/System.IO.FileSystem.Tests/FileStream/Dispose.cs:line 487
--- End of stack trace from previous location ---

  10. JulieLeeMSFT commented on Oct 28, 2026

    @JulieLeeMSFT
    JulieLeeMSFT
    on Oct 28, 2026
    MemberAuthor

    Failed in (1):

    Console Log: Console Log
    Source: runtime-coreclr libraries-jitstress2-jitstressregs / net11.0-linux-Release-arm-jitstress2_jitstressregs3-(Debian.13.Arm32.Open)AzureLinux.3.Arm64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-13-helix-arm32v7@sha256:38844e127f1c1422bfbbfcb56012dfefc906d728f6a305bfd1aae70881ac6941 / System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization

    Failed tests:

    - net11.0-linux-Release-arm-jitstress2_jitstressregs3-(Debian.13.Arm32.Open)AzureLinux.3.Arm64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-13-helix-arm32v7@sha256:38844e127f1c1422bfbbfcb56012dfefc906d728f6a305bfd1aae70881ac6941
- net11.0-linux-Release-arm64-jitstress2_jitstressregs3-AzureLinux.3.Arm64.Open
- net11.0-windows-Release-x86-jitstress2_jitstressregs0x80-Windows.10.Amd64.Open
  - System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalization
  - System.IO.Tests.FileStream_Dispose.DisposeSuppressesStrategyFinalizationAsync

  11. JulieLeeMSFT commented on Oct 29, 2026

    @JulieLeeMSFT
    JulieLeeMSFT
    on Oct 29, 2026
    MemberAuthor

    @jeffhandley this test is constantly failing. Can you please fix it soon?

  12. jeffhandley
    modified the milestones: Future, 12.0.0 on Oct 29, 2026
  13. jeffhandley
    assigned
    adamsitnik
    on Oct 29, 2026

  14. adamsitnik commented on Oct 30, 2026

    @adamsitnik
    adamsitnik
    on Oct 30, 2026
    Member

    This test was added 4 years ago in #64997 and not modified ever since.

    Since it fails only for JIT stress and uses following pattern to avoid JIT lifetime-extension issues, I think it's best to move it to codegen area and ask somebody from the JIT team to take a look.

    runtime/src/libraries/System.Runtime/tests/System.IO.FileSystem.Tests/FileStream/Dispose.cs

    Lines 489 to 490 in f1fdb60

    // separate method to avoid JIT lifetime-extension issues
    static async Task<WeakReference> EnsureFileStreamIsNotRooted(Func<FileStream> factory, bool useAsync)

  15. adamsitnik
    added
    JitStressCLR JIT issues involving JIT internal stress modes
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    and removed
    area-System.IO
    on Oct 30, 2026

  16. dotnet-policy-service commented on Oct 30, 2026

    @dotnet-policy-service
    dotnet-policy-serviceBot
    on Oct 30, 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.

  17. JulieLeeMSFT
    marked Test Failure: System.IO.Tests.FileStream_Dispose.DerivedFileStreamDisposeSuppressesStrategyFinalization* #136604 as a duplicate of this issue on Nov 2, 2026
  18. JulieLeeMSFT
    added a commit that references this issue on Nov 2, 2026

    Prevent inlining of the helper in the FileStream strategy finalizatio…

    c9c97da

  19. JulieLeeMSFT commented on Nov 2, 2026

    @JulieLeeMSFT
    JulieLeeMSFT
    on Nov 2, 2026
    MemberAuthor

    #136726 fixed the jitstress2_jitstressregs*  legs. They had 4 hits in 4 weekly runs before the fix and now pass.
    x86 jitstress2_tiered leg had 9 hits in about 30 daily runs, and it did not reproduce locally (~30% failure rate). We will let it run for a week to see if it is green for 7 days.

  20. JulieLeeMSFT
    assigned
    JulieLeeMSFT
    and unassigned
    adamsitnik
    on Nov 2, 2026
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