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

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1542248
Build error leg or test failing: windows-x64 Release NativeAOT_Pri1 - JIT/Regression/JitBlue/Runtime_101046/Runtime_101046

Error Details

13:11:03.521 Running test: JIT\Regression\JitBlue\Runtime_101046\Runtime_101046\Runtime_101046.cmd
Unhandled exception. System.IO.FileNotFoundException: Could not find file 'TestLibrary'.
File name: 'TestLibrary'
   at Internal.Runtime.TypeLoaderExceptionHelper.CreateFileNotFoundException(ExceptionStringID, String)
   at __GeneratedMainWrapper.Main()

Return code:      1
Expected: 100
Actual: -1073740791
END EXECUTION - FAILED

This NativeAOT test regularly fails on windows.10.amd64 in the
runtime-nativeaot-outerloop pipeline (definition 265). The generated NativeAOT
entry point throws System.IO.FileNotFoundException: Could not find file 'TestLibrary' from TypeLoaderExceptionHelper.CreateFileNotFoundException
before the test body runs, exiting with -1073740791 (0xC0000409). The
signature is stable across builds 1541654, 1542248, and follow-up 1543362.

First build it occurred: 1541654 (2026-08-05).

Error Message

{
  "ErrorMessage": [
    "Running test: JIT\\Regression\\JitBlue\\Runtime_101046",
    "Unhandled exception. System.IO.FileNotFoundException: Could not find file 'TestLibrary'."
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Note

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Report

Build	Repository	Test	Pull Request
1545024	dotnet/runtime	JIT\Regression\JitBlue\Runtime_101046\Runtime_101046\Runtime_101046.cmd
1544115	dotnet/runtime	JIT\Regression\JitBlue\Runtime_101046\Runtime_101046\Runtime_101046.cmd

Summary

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

[dotnet-policy-service]

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

[github-actions]

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.

Warning

Firewall blocked 1 domain

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• awmgmcpg

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
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    - "awmgmcpg"

See Network Configuration for more information.

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