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[Tests] LogsPipelineUnitTests TestLogsPipeline fails with Assert.Equal() Failure #5659
Description
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1483640
Build error leg or test failing: Microsoft.Diagnostics.Monitoring.EventPipe.UnitTests.LogsPipelineUnitTests.TestLogsPipeline
{
"ErrorMessage": "Assert.Equal() Failure: Values differ\\nExpected: 5\\nActual:",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Assert.Equal() Failure: Values differ\nExpected: 5\nActual: 2
This line might be
The test failed on an unrelated PR on MacOS_x64_Debug Microsoft.Diagnostics.Monitoring.EventPipe.UnitTests.LogsPipelineUnitTests.TestLogsPipeline(config: projectk.sdk.prebuilt.10.0.2) https://dev.azure.com/dnceng-public/public/_build/results?buildId=1224196&view=ms.vss-test-web.build-test-results-tab&runId=33919198&resultId=100117&paneView=debug
The console output looks like
[12/8/2025 8:52:57 PM] Test runner created
Running Process: /Users/runner/work/1/s/artifacts/dotnet-test/dotnet --fx-version 10.0.2 /Users/runner/work/1/s/artifacts/bin/EventPipeTracee/Debug/net10.0/EventPipeTracee.dll 12a52368-197c-48b4-8895-e208ec15f021 LoggerRemoteTest
Working Directory:
Additional Environment Variables: DOTNET_ROOT=/Users/runner/work/1/s/artifacts/dotnet-test
{
[00:00.313] 10921 Successfully started process
[00:00.316] 10921 WaitForTracee
00:00.277: 10921 EventPipeTracee: DiagMetrics False UseActivitySource False
00:00.280: 10921 EventPipeTracee: DuplicateNameMetrics False
00:00.280: 10921 EventPipeTracee: start process
00:00.280: 10921 EventPipeTracee: connecting to pipe
00:00.280: 10921 EventPipeTracee: connected to pipe
[00:00.318] 10921 WaitForTracee: DONE
00:00.668: 10921 EventPipeTracee: 12/8/2025 8:52:58 PM Awaiting start
[00:01.555] 10921 WakeupTracee
[00:01.555] 10921 WakeupTracee DONE
[00:01.555] 10921 WaitForSignal
00:01.519: 10921 12/8/2025 8:52:59 PM Starting test body '42'
00:01.568: 10921 EventPipeTracee: signal end of test data
[00:01.605] 10921 WaitForSignal DONE 31
00:01.569: 10921 12/8/2025 8:52:59 PM Awaiting end
[00:01.949] 10921 WakeupTracee
[00:01.949] 10921 WakeupTracee DONE
00:01.913: 10921 EventPipeTracee 12/8/2025 8:52:59 PM Ending remote test process '42'
}
[00:02.050] 10921 Disposing
[00:02.050] 10921 WakeupTracee
Process 10921 exited 0 (00:02.014 elapsed)
[00:02.051] 10921 WakeupTracee DONE
[00:02.051] 10921 WaitForExitAsync
[00:02.051] 10921 WaitForExitAsync DONE
Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1483640
Error message validated: [Assert.Equal() Failure: Values differ\nExpected: 5\nActual:]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 6/27/2026 12:21:20 AM UTC
Report
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 1 | 3 | 16 |
Activity
hoyosjs commentedon May 2, 2026
This is actually a runtime issue: dotnet/runtime#127681. Added a workaround for now in #5767
hoyosjs commentedon May 14, 2026
Looks like this is still hitting pretty hard
Temporarily force known CI test failure
Temporarily force known CI test failure
Temporarily force known CI test failure
Initialize EventPipe tracee logging before collection (dotnet#6028)