CooperativeBlockingWithProcessingThreadsAndGoalThreadsAndAddWorkerRaceTest test failure

[jkotas]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1232178
Build error leg or test failing: System.Threading.ThreadPools.Tests.ThreadPoolTests.CooperativeBlockingWithProcessingThreadsAndGoalThreadsAndAddWorkerRaceTest
Pull request: #122530

Error Message

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

{
  "ErrorMessage": "CooperativeBlockingWithProcessingThreadsAndGoalThreadsAndAddWorkerRaceTest",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1232178
Error message validated: [CooperativeBlockingWithProcessingThreadsAndGoalThreadsAndAddWorkerRaceTest]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 12/16/2025 1:57:07 AM UTC

Report

Build	Definition	Test	Pull Request
1268114	dotnet/runtime	System.Threading.ThreadPools.Tests.ThreadPoolTests.CooperativeBlockingWithProcessingThreadsAndGoalThreadsAndAddWorkerRaceTest	#123645
1257166	dotnet/runtime	System.Threading.ThreadPools.Tests.ThreadPoolTests.CooperativeBlockingWithProcessingThreadsAndGoalThreadsAndAddWorkerRaceTest	#123307

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	1	2

[jkotas]

Related #121285

@jkoritzinsky Looks like there is still a problem

[jkoritzinsky]

Having a win-x64 failure should make this easier to figure out than the Linux-arm ones (there's probably a shared underlying bug between the two).

[jkoritzinsky]

Fixed by #122571 (the matched failure in #123645 is unrelated to this issue and is instead related to various other failures in that PR).