Flaky test: StartDetached_GrandchildSurvivesSignalingParent(enable: False)

[adamsitnik]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1378923
Build error leg or test failing: System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent
Pull request: #126807

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": ["System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent(enable: False)","Assert.Equal()"],
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

    System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent(enable: False) [FAIL]
      Assert.Equal() Failure: Values differ
      Expected: False
      Actual:   True
      Stack Trace:
        /_/src/libraries/System.Diagnostics.Process/tests/ProcessTests.cs(353,0): at System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent(Boolean enable)
           at InvokeStub_ProcessTests.StartDetached_GrandchildSurvivesSignalingParent(Object, Span`1)
        /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs(95,0): at System.Reflection.MethodBaseInvoker.InvokeWithOneArg(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1378923
Error message validated: [System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent(enable: False) Assert.Equal()]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/15/2026 6:24:18 AM UTC

Report

Build	Definition	Test	Pull Request
1380272	dotnet/runtime	System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent	#125439
2951629	dotnet-runtime	System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent
1378923	dotnet/runtime	System.Diagnostics.Tests.ProcessTests.StartDetached_GrandchildSurvivesSignalingParent	#126807

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
1	3	3

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