[ci-scan] Test failure: NativeAOT GC leg assert ASSERT_UNCONDITIONALLY in EHHelpers.cpp:600

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1530325
Build error leg or test failing: windows-x64 Checked NativeAOT_Pri1 - GC

Error Details

A NativeAOT runtime assertion fires while running the GC test group (runtime-nativeaot-outerloop, def 265) on the windows-x64 Checked NativeAOT_Pri1 leg. The failure reproduces in the immediately following build #1531134 on the same leg, so it is not a transient flake.

Running test: GC\Coverage\271010\271010.dll
Debug Assertion Violation
Expression: 'ASSERT_UNCONDITIONALLY'
File: D:\a\_work\1\s\src\coreclr\nativeaot\Runtime\EHHelpers.cpp, Line: 600
END EXECUTION - FAILED

First build it occurred: 1530325 (windows-x64 Checked NativeAOT_Pri1). Still present in follow-up build 1531134.

Error Message

{
  "ErrorMessage": [
    "Expression: 'ASSERT_UNCONDITIONALLY'",
    "File: D:\\a\\_work\\1\\s\\src\\coreclr\\nativeaot\\Runtime\\EHHelpers.cpp, Line: 600"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Note

This issue was generated by an AI/Copilot-driven CI triage workflow.

Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• awmgmcpg
• dotnet.github.io

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

network:
  allowed:
    - defaults
    - "awmgmcpg"
    - "dotnet.github.io"

See Network Configuration for more information.

Generated by CI Outer-Loop Failure Scanner · 998.3 AIC · ⌖ 16.6 AIC · ⊞ 18.7K · ◷

Report

Build	Repository	Test	Pull Request
1545347	dotnet/runtime	tracing\eventpipe\reverseouter\reverseouter\reverseouter.cmd
1542248	dotnet/runtime	GC.WorkItemExecution
1535331	dotnet/runtime	GC.WorkItemExecution
1532833	dotnet/runtime	GC.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
1	2	4

[MichalStrehovsky]

@jkoritzinsky I assume this is another fallout from dropping the RequiresProcessIsolation, I assume some other test puts things into a bad state, but hard to say. I'm taking time off.

As a curiosity, the test that is crashing here only runs with CoreCLR on Browser. I guess nobody reviews what Copilot does to tests anymore since it's "just test code" (I do not understand how we ended up allowing this test on CoreCLR Browser specifically).

runtime/src/tests/GC/Coverage/271010.cs

Line 19 in 2f1e024

[ActiveIssue("https://github.com/dotnet/runtime/issues/5933", typeof(Test_271010), nameof(IsCoreClrOnNonBrowser))]

[dotnet-policy-service]

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

[github-actions]

Workflow artifact: ci-fix
Artifact kind: handoff
Linked KBE: #131565

Note

AI/Copilot-generated triage note.

This Known Build Error surfaces a NativeAOT native-runtime assertion (ASSERT_UNCONDITIONALLY in src/coreclr/nativeaot/Runtime/EHHelpers.cpp:600) firing while running the GC coverage test GC\Coverage\271010\271010.dll on the windows-x64 Checked NativeAOT_Pri1 - GC leg. This is a runtime/exception-handling code path in native C++ that must not be auto-patched by this workflow, so I could not produce even a best-effort code diff. Looping in owners so it can be fixed forward rather than muted.

Root cause (best analysis)

The assert lives in the NativeAOT exception-handling helpers (EHHelpers.cpp). Line 600 sits in the unconditional-failure path reached when the EH machinery encounters an unexpected state while unwinding/dispatching within the GC coverage stress test. Because it reproduces in the immediately following build (#1531134) on the same leg, it is a real, non-transient failure rather than a flake. Diagnosing it requires inspecting the native EH dispatch state at the assert (frame/unwind context), which is outside the safe scope of an automated library fix.

Evidence

• Failing build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1530325
• Also observed (follow-up): https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531134
• Leg: windows-x64 Checked NativeAOT_Pri1 - GC (runtime-nativeaot-outerloop, def 265)
• Failing test: GC\Coverage\271010\271010.dll
• Possible related PR: none identified with sufficient confidence.

Suggested reviewers / area contacts

• Likely author: none identified with sufficient confidence.
• Area owners (area-NativeAOT-coreclr): @agocke, @dotnet/ilc-contrib

A fix will likely require examining the native EH state at EHHelpers.cpp:600 under this GC coverage test to determine why the exception-handling helper reaches the unconditional-assert path on NativeAOT/Windows-x64.

Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• awmgmcpg
• httpbin.org

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

network:
  allowed:
    - defaults
    - "awmgmcpg"
    - "httpbin.org"

See Network Configuration for more information.

Generated by CI Outer-Loop Failure Fixer · 615.8 AIC · ⌖ 15.4 AIC · ⊞ 17.1K · ◷