[ci-scan] Test failure: cDAC dump tests fail with DllNotFoundException loading msvcrt.dll on linux-arm host (windows_x64 dumps)

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Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594914
Build error leg or test failing: linux-arm release CdacXPlatDumpTest (CdacXPlatDumpTests_host_linux_arm_dumps_windows_x64) - Microsoft.Diagnostics.DataContractReader.DumpTests

KBE authoring guidance (ci-failure-scan)

• Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
• Build Analysis parses only the single JSON block under Error Message.
• ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
• Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.

Error Details

Eleven cDAC dump tests fail in the linux-arm release CdacXPlatDumpTest leg (work item CdacXPlatDumpTests_host_linux_arm_dumps_windows_x64) when the cDAC reader running on a linux-arm host processes a windows_x64 dump. Every failure is a System.DllNotFoundException while trying to load msvcrt.dll through Microsoft.Diagnostics.Runtime:

Microsoft.Diagnostics.DataContractReader.DumpTests.RCWDumpTests.GetRCWData_ContainedRCW_IsMarkedContained(config: local/r2r (windows_x64)) [FAIL]
  System.DllNotFoundException : Unable to load shared library 'msvcrt.dll' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
  /root/helix/work/correlation/shared/Microsoft.NETCore.App/12.0.0/msvcrt.dll.so: cannot open shared object file: No such file or directory
  /root/helix/work/correlation/tests/msvcrt.dll.so: cannot open shared object file: No such file or directory
  /root/helix/work/correlation/shared/Microsoft.NETCore.App/12.0.0/libmsvcrt.dll: cannot open shared object file: No such file or directory
  /root/helix/work/correlation/tests/libmsvcrt.dll: cannot open shared object file: No such file or directory

  Stack Trace:
       at Microsoft.Diagnostics.Runtime.Windows.CacheNativeMethods.Memory.memcpy(UIntPtr dest, UIntPtr src, UIntPtr count)

Affected tests include RCWDumpTests, DacDbiRCWDumpTests, StackReferenceDumpTests, and StackWalkDumpTests (config local/r2r (windows_x64)). Test run summary: Total: 502, Errors: 0, Failed: 11, Skipped: 219.

The signature is stable: it reproduces in source build 1594914 and in the later build 1596978, and the linux-arm release CdacXPlatDumpTest leg fails across the scanned window. Only the windows_x64 dump leg of the linux-arm host is affected; the other dump legs on that host pass.

Error Message

{
  "ErrorMessage": [
    "Microsoft.Diagnostics.DataContractReader.DumpTests",
    "System.DllNotFoundException : Unable to load shared library 'msvcrt.dll'"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 247 hits in failure.log

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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

This issue was filed by an AI agent (GitHub Copilot / ci-failure-scan workflow).

Generated by CI Outer-Loop Failure Scanner · opus48 · 1K AIC · ⌖ 13.8 AIC · ⊞ 19.7K · ◷

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Summary

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

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