[ci-scan] Test failure: JIT/Regression/JitBlue/Runtime_101046 NativeAOT FileNotFoundException 'TestLibrary' #131997

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1. github-actions

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5. github-actions commented on Aug 8, 2026

   

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   Workflow artifact: ci-fix
   Artifact kind: handoff
   Linked KBE: #131997

   Note

   AI/Copilot-generated triage note.

   This Known Build Error has no producible automated code change I can stand behind (the test is [ActiveIssue]-guarded for the exact platform capability that appears to be at play, and the remaining candidate changes are NativeAOT-harness / rooting decisions rather than a small safe source diff — and the one mitigation that would "work", disabling the test, is out of scope for this workflow). Looping in owners so it can be fixed forward rather than muted.

   Root cause (best analysis)

   On the runtime-nativeaot-outerloop NativeAOT_Pri1 windows-x64 leg, JIT/Regression/JitBlue/Runtime_101046 fails before the test body runs:

   Unhandled exception. System.IO.FileNotFoundException: Could not find file 'TestLibrary'.
      at Internal.Runtime.TypeLoaderExceptionHelper.CreateFileNotFoundException(...)
      at __GeneratedMainWrapper.Main()
   Return code: 1 (0xC0000409)
   

   The test P/Invokes into a native Runtime101046Native asset and references the managed TestLibrary helper. The generated NativeAOT entry point throws FileNotFoundException: Could not find file 'TestLibrary' from TypeLoaderExceptionHelper — i.e. under NativeAOT the TestLibrary assembly (or a type it needs) is not present/resolvable at runtime in the app layout for this test.

   Notably the test already carries:

   [ActiveIssue("https://github.com/dotnet/runtime/issues/123946", typeof(PlatformDetection), nameof(PlatformDetection.PlatformDoesNotSupportNativeTestAssets))]

   so on platforms that lack native test-asset support it is skipped. The NativeAOT windows-x64 leg is not excluded by that guard, yet the native/TestLibrary asset is missing at run time — this looks like a NativeAOT test-layout / harness packaging gap (the managed TestLibrary and the native asset not being copied/rooted into the NativeAOT app bundle), which is an owner decision, not a mechanical source fix. I deliberately did not propose an [ActiveIssue] widening or a test-disable, since this workflow must not mute tests.

   Evidence

   • Failing build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1542248 (leg: windows-x64 Release NativeAOT_Pri1)
   • First build it occurred: 1541654 (2026-08-05); stable across 1541654, 1542248, follow-up 1543362.
   • Possible related PR: none identified with sufficient confidence.

   Suggested reviewers / area contacts

   • Area owners (area-NativeAOT-coreclr): @agocke, @dotnet/ilc-contrib
   • CodeGen (area-CodeGen-coreclr): @JulieLeeMSFT, @dotnet/jit-contrib

   A fix would likely involve ensuring the managed TestLibrary assembly and the native Runtime101046Native asset are packaged/rooted into the NativeAOT app layout for this test (or adjusting the harness so native-test-asset tests are handled consistently under NativeAOT), so __GeneratedMainWrapper.Main() can resolve TestLibrary at run time.

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   Generated by CI Outer-Loop Failure Fixer · 400.7 AIC · ⌖ 18.4 AIC · ⊞ 17.1K · ◷
6. AndyAyersMS

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   untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

   on Aug 11, 2026
7. AndyAyersMS

   assigned

   Copilot

   and

   AndyAyersMS

   on Aug 11, 2026
8. Copilot

   linked a pull request that will close this issueFix FileNotFoundException in NativeAOT test #132173on Aug 11, 2026
9. AndyAyersMS

   closed this as completedin #132173on Aug 13, 2026
10. AndyAyersMS

    added a commit that references this issue on Aug 13, 2026

    Fix FileNotFoundException in NativeAOT test (#132173)

    ...

    This issue will close once commit 0c4851b is merged into the 'main' branch.

    0c4851b
11. github-actions

    locked and limited conversation to collaborators on Sep 12, 2026