Test failure: Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedCanBeCancelled

[v-wenyuxu]

Failed in: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1052116&view=results

Failed tests:

net10.0-windows-Release-x64-fullpgo_methodprofiling-Windows.10.Amd64.Open
    - Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedCanBeCancelled

Error message:

 Assert.True() Failure
Expected: True
Actual:   False

Stack trace:

   at Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedCanBeCancelled() in /_/src/libraries/Microsoft.Extensions.Hosting/tests/UnitTests/Internal/HostTests.cs:line 488
--- End of stack trace from previous location ---

Known Issue Error Message

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

{
  "ErrorMessage": "Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedCanBeCancelled [FAIL]",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: :mag_right: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1052116 Error message validated: [Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedCanBeCancelled [FAIL]] Result validation: :white_check_mark: Known issue matched with the provided build. Validation performed at: 5/28/2025 9:10:37 AM UTC

Report

Build	Definition	Test	Pull Request
1052116	dotnet/runtime	Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedCanBeCancelled	dotnet/runtime#115977

Summary

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

[dotnet-policy-service[bot]]

Tagging subscribers to this area: @dotnet/area-extensions-hosting See info in area-owners.md if you want to be subscribed.

[steveharter]

Test code hasn't changed since it was added 6 years ago: https://github.com/dotnet/runtime/blame/9e28706dbc252e27174dce1a3b8f69c8ecc912b7/src/libraries/Microsoft.Extensions.Hosting/tests/UnitTests/Internal/HostTests.cs#L488

It is waiting for 5 seconds until lifetimeStart is signaled.

Assert.True(lifetimeStart.WaitOne(TimeSpan.FromSeconds(5)));

However that is done on a Task via Task.Run(() => host.StartAsync()); so that may not always be reliable.

Will wait to see if there are any other hits.

Possible PGO issue?

[jeffschwMSFT]

removing blocking-clean-ci as it has not failed in 30 days

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