[ci-scan] Test failure: cDAC stress test on Windows.11.Arm64.Open

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1465771
Build error leg or test failing: windows-arm64 release CdacStressTest - Fail on test errors

Error Details

The cDAC stress test phase on windows-arm64 release consistently fails. The "Fail on test errors" PowerShell task detects one or more cDAC stress test failures and fails the job. This occurs on the Windows.11.Arm64.Open Helix queue.

One or more cDAC stress test failures were detected. Failing the job.

Error Message

true only for clear infra flakes. ExcludeConsoleLog skips helix log scanning. -->

{
  "ErrorMessage": "One or more cDAC stress test failures were detected. Failing the job.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Impact on platforms

• runtime-diagnostics (def 309) / windows-arm64 release CdacStressTest / Helix queue: Windows.11.Arm64.Open

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1462610
• Finished: 2026-06-13T05:40:49Z
• Occurrences in window: 5 (builds 1462610, 1463142, 1463820, 1465771, 1467646)
• Persistent across the entire scanned window; true origin may predate 2026-06-13.

Confirmed in follow-up build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1467646

Related: #129384 (sibling KBE for cDAC dump generation hang on same queue)

Duplicate search

• "cDAC stress test" label:"Known Build Error" — 0 results
• is:open "cDAC stress test" in:title — 0 results
• is:pr is:open "cDAC stress" in:title — 0 results matching this failure
• is:closed label:"Known Build Error" "cDAC stress" closed:>=2026-05-18 — 0 results

No existing KBE or PR matches this signature.

---

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

Note

🔒 Integrity filter blocked 2 items

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

• #125825 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Multiple Helix work items fail on maccatalyst/tvos CoreCLR Release #126460 issue_read: 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 · ● 33.8M · ◷

Report

Build	Repository	Step Name	Console log	Pull Request
1470060	dotnet/runtime	Fail on test errors	Log	#129091
1470034	dotnet/runtime	Fail on test errors	Log
1469892	dotnet/runtime	Fail on test errors	Log	#129553
1469858	dotnet/runtime	Fail on test errors	Log	#129272
1466901	dotnet/runtime	Fail on test errors	Log	#129261
1469725	dotnet/runtime	Fail on test errors	Log	#129547
1469658	dotnet/runtime	Fail on test errors	Log	#129542
1469231	dotnet/runtime	Fail on test errors	Log	#129411

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
8	8	8