[ci-scan] Test failure: paltest_pal_sxs_test1 Exit code 137 on macOS

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1440191
Build error leg or test failing: osx-arm64 Debug PALTests / Send job to Helix (Unix)

Error Details

paltest_pal_sxs_test1 (PAL side-by-side exception handling test) fails with exit code 137 (SIGKILL, likely timeout/hang) on macOS ARM64 and x64. The test verifies PAL exception handling across two DLLs each with their own PAL instance. On macOS ARM64, the Mach exception port forwarding mechanism intermittently deadlocks, causing the test harness to SIGKILL the process.

The following test(s) failed:
exception_handling/pal_sxs/test1/paltest_pal_sxs_test1. Exit code: 137

PAL Test Results:
  Passed: 273
  Failed: 1

Related: #122345 (existing KBE with incorrect ErrorMessage that never matched)

Error Message

{
  "ErrorMessage": "exception_handling/pal_sxs/test1/paltest_pal_sxs_test1. Exit code: 137",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Impact on platforms

• runtime-coreclr outerloop (def 108): osx-arm64 Debug PALTests @ OSX.1200.ARM64.Open
• runtime-coreclr outerloop (def 108): osx-x64 Debug PALTests @ OSX.1200.Amd64.Open

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1440191
• Finished: 2026-05-29T09:02:32Z
• Persistent across the entire scanned window; true origin may predate 2025-12-09 (see FAILED: exception_handling/pal_sxs/test1/paltest_pal_sxs_test1. Exit code: 137 in outerloop #122345 created then).
• Occurrences in window: 10+ (all 10 sampled builds failed)

---

Filed by ci-failure-scan, which scans dnceng-public outer-loop pipelines on main and converts stable failures into KBEs and test-disable PRs.

Generated by CI Outer-Loop Failure Scanner · ● 30.6M · ◷

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Summary

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

[jkotas]

Duplicate of #122345