[ci-scan] Test failure: System.Diagnostics.Tests.PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static

[lewing]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1616817
Build error leg or test failing: windows-x86 Release Libraries_NET481-System.Diagnostics.PerformanceCounter.Tests
Pull request: #134758

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

Helix job 1d4f20b5-4f33-44bf-8afe-9f9065175ff1, queue windows.10.amd64.client.open.rt (.NET Framework 4.8.1, x86). PerformanceCounterCategory("Processor").GetInstanceNames() returned no instances on the Helix machine. The PR under test only changes the Wasm JIT, so it doesn't touch this code path.

System.Diagnostics.Tests.PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static [FAIL]
  Expected: 0 to be greater than 0 PerformanceCounterCategory.GetInstanceNames() returned 0.
  Stack Trace:
    /_/src/libraries/Common/tests/TestUtilities/System/AssertExtensions.cs(335,0): at System.AssertExtensions.GreaterThan[T](T actual, T greaterThan, String userMessage)
    /_/src/libraries/System.Diagnostics.PerformanceCounter/tests/PerformanceCounterCategoryTests.cs(282,0): at System.Diagnostics.Tests.PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static()

Error Message

{
  "ErrorMessage": [
    "PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static [FAIL]",
    "PerformanceCounterCategory.GetInstanceNames() returned 0."
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 1 hits in failure.log

Note

This issue was generated with GitHub Copilot assistance.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1616817
Error message validated: [PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static [FAIL] PerformanceCounterCategory.GetInstanceNames() returned 0.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/29/2026 11:28:18 PM UTC

Report

Build	Repository	Test	Pull Request
1616817	dotnet/runtime	System.Diagnostics.Tests.PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static	#134758

Summary

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

[MihuBot]

I'm a bot. Here are possible related and/or duplicate issues (I may be wrong):

• Test failure:System.Diagnostics.Tests.PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static #119979
• Test failure System.Diagnostics.Tests.PerformanceCounterCategoryTests.PerformanceCounterCategory_InstanceExists_Static #83317
• System.Diagnostics.Tests.PerformanceCounterTests failed in CI #60933

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