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Test Failure: JIT/Methodical/tailcall_v4/hijacking/hijacking.dll & JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll #123867

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#123910
Closed
Test Failure: JIT/Methodical/tailcall_v4/hijacking/hijacking.dll & JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll#123867
#123910
Assignees
jakobbotsch
Labels
area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIblocking-clean-ci-optionalBlocking optional rolling runs
Milestone
11.0.0

Description

@shimingsg
shimingsg
opened on Feb 2, 2026

Failed in: runtime-coreclr pgostress 20260130.1

Failed tests:

coreclr linux arm64 Checked fullpgo @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked syntheticpgo @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked fullpgo_random_gdv @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked syntheticpgo_blend @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked fullpgo_methodprofiling @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked fullpgo_random_gdv_methodprofiling_only @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked fullpgo_random_gdv_edge @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux arm64 Checked fullpgo_methodprofiling_always_optimized @ AzureLinux.3.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked fullpgo @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked fullpgo_methodprofiling @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked syntheticpgo @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked syntheticpgo_blend @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked fullpgo_methodprofiling_always_optimized @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked fullpgo_random_gdv @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked fullpgo_random_gdv_edge @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr linux x64 Checked fullpgo_random_gdv_methodprofiling_only @ AzureLinux.3.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked fullpgo @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked syntheticpgo @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked fullpgo_random_gdv_edge @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked fullpgo_methodprofiling_always_optimized @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked fullpgo_methodprofiling @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked syntheticpgo_blend @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked fullpgo_random_gdv @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr osx arm64 Checked fullpgo_random_gdv_methodprofiling_only @ OSX.26.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
coreclr windows x64 Checked fullpgo @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked fullpgo_random_gdv_edge @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked fullpgo_methodprofiling @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked fullpgo_random_gdv @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked fullpgo_methodprofiling_always_optimized @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked syntheticpgo_blend @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked syntheticpgo @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked instrument_if_optimizing @ Windows.10.Amd64.Open
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows x64 Checked fullpgo_random_gdv_methodprofiling_only @ Windows.10.Amd64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows arm64 Checked fullpgo @ Windows.11.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll
coreclr windows arm64 Checked fullpgo_random_gdv_edge @ Windows.11.Arm64.Open
- JIT/Methodical/tailcall_v4/hijacking/hijacking.dll
- JIT/opt/Tailcall/TailcallVerifyWithPrefix/TailcallVerifyWithPrefix.dll

Error message:

Assert.Equal() Failure: Values differ
Expected: 100
Actual:   101

Stack trace:

   at Xunit.Assert.Equal[T](T expected, T actual, IEqualityComparer`1 comparer) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs:line 174
   at Program.<<Main>$>g__TestExecutor76|2_77(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass2_0&)

Activity

  1. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Feb 2, 2026
  2. github-actions
    added
    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
    on Feb 2, 2026

  3. dotnet-policy-service commented on Feb 2, 2026

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

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

  4. MihuBot commented on Feb 2, 2026

    @MihuBot
    MihuBot
    on Feb 2, 2026

    I'm a bot. Here are possible related and/or duplicate issues (I may be wrong):

  5. shimingsg
    added
    blocking-clean-ci-optionalBlocking optional rolling runs
    on Feb 2, 2026

  6. jakobbotsch commented on Feb 2, 2026

    @jakobbotsch
    jakobbotsch
    on Feb 2, 2026
    Member

    Oddly I see this failing with even old coreruns from many months ago.

  7. jakobbotsch commented on Feb 2, 2026

    @jakobbotsch
    jakobbotsch
    on Feb 2, 2026
    Member

    Looks like these started to run with #123248, cc @jkoritzinsky, presumably not intended? Before:

    07:50:34.389 Running test: JIT/Methodical/tailcall_v4/hijacking/hijacking.cmd

Return code:      0
Raw output file:      C:\h\w\B86C09EB\w\A6910896\uploads\tailcall_v4\hijacking\output.txt
Raw output:
BEGIN EXECUTION
SKIPPING EXECUTION BECAUSE DOTNET_TieredCompilation has not been disabled and this test is marked JitOptimizationSensitive
Test Harness Exitcode is : 0
To run the test:
Set up CORE_ROOT and run.
> C:\h\w\B86C09EB\w\A6910896\e\JIT\Methodical\Methodical_others\../tailcall_v4/hijacking/hijacking.cmd

    Still, I think there is something to investigate here.

  8. JulieLeeMSFT
    removed
    untriagedNew issue has not been triaged by the area owner
    on Feb 2, 2026
  9. JulieLeeMSFT
    added this to the 11.0.0 milestone on Feb 2, 2026
  10. JulieLeeMSFT
    assigned
    jakobbotsch
    on Feb 2, 2026

  11. jkoritzinsky commented on Feb 2, 2026

    @jkoritzinsky
    jkoritzinsky
    on Feb 2, 2026
    Member

    Yeah these running in new pipelines is not intended. I guess I need to fix the AnyJITStress handling. I'll have a PR up soon.

  12. jkoritzinsky commented on Feb 2, 2026

    @jkoritzinsky
    jkoritzinsky
    on Feb 2, 2026
    Member

    Looks like I used the wrong suppression mode actually, so should be an easy fix.

  13. jkoritzinsky
    added a commit that references this issue on Feb 2, 2026

    FIx supressions that were missed/invalid after issues.targets migration

    b1dd323
  14. jkotas
    closed this as completedin 2308583on Feb 3, 2026
  15. adamperlin
    added a commit that references this issue on Feb 3, 2026

    FIx supressions that were missed/invalid after issues.targets migrati…

    2308583

  16. jakobbotsch commented on Feb 4, 2026

    @jakobbotsch
    jakobbotsch
    on Feb 4, 2026
    Member

    I want to take a closer look at this still.

  17. jakobbotsch
    reopened this on Feb 4, 2026

  18. jakobbotsch commented on Feb 6, 2026

    @jakobbotsch
    jakobbotsch
    on Feb 6, 2026
    Member

    The hijacking test is not compatible with OSR -- it is verifying that the address of an implicit byref does not change anymore after the 3rd tailcall, but when an OSR transition happens inside DispatchTailCalls it changes. This manifests with DOTNET_ReadyToRun=0 and TieredCompilation=1.

    The TailcallVerifyWithPrefix test is not compatible with TieredCompilation=1 since it tries to validate some opportunistic tailcalls by checking for stack frames not being present.

    So doesn't look like there is any bug here.

  19. jakobbotsch
    closed this as completedon Feb 6, 2026
  20. lewing
    added a commit that references this issue on Feb 9, 2026

    FIx supressions that were missed/invalid after issues.targets migrati…

    0955ea9
  21. iremyux
    added a commit that references this issue on Mar 2, 2026

    FIx supressions that were missed/invalid after issues.targets migrati…

    1b14a2d
  22. github-actions
    locked and limited conversation to collaborators on Mar 9, 2026
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