[ci-scan] Skip paltest_pal_sxs_test1 on osx-arm64 (refs #122345)

[github-actions]

Reasoning

The PAL SxS test1 (exception_handling/pal_sxs/test1/paltest_pal_sxs_test1) consistently hangs and gets killed with exit code 137 (SIGKILL) on osx-arm64 in the runtime-coreclr outerloop pipeline (definition 108). The test exercises PAL side-by-side exception handling via Mach message passing, which has a threading race on macOS ARM64. Adding an exclusion scoped to osx/arm64 in issues.targets is the standard PAL test disable mechanism.

Linked KBE: dotnet#122345

Match verification (from Step 4.8):

1. Same test/family: yes — paltest_pal_sxs_test1 matches exactly
2. Same failure signature: yes — exit code 137 (SIGKILL/timeout)
3. Same OS: yes — osx (macOS)
4. Same architecture: yes — arm64

Impact on platforms

• runtime-coreclr outerloop (def 108) / osx-arm64 Debug PALTests / OSX.1200.Amd64.Open — exit code 137

Errors log

FAILED: exception_handling/pal_sxs/test1/paltest_pal_sxs_test1. Exit code: 137
The following test(s) failed:
Failed: 1

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1223700
• Finished: 2025-12-09 (KBE filed date)
• Occurrences in window: 3 consecutive (builds 1427517, 1427851, 1428654)
• Computed within the scanned window; may not be the true origin.

Linked issue

dotnet#122345

Note

🔒 Integrity filter blocked 3 items

The following items were blocked because they don't meet the GitHub integrity level.

• #125825search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #128409pull_request_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #128392search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
github:
min-integrity: approved # merged | approved | unapproved | none

Generated by CI Outer-Loop Failure Scanner · ● 42.1M · ◷