System.Net.Http.Functional.Tests.SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse: System.TimeoutException #132085

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1544854
Build error leg or test failing: System.Net.Http.Functional.Tests.SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse
Pull request: #131671

System.Net.Http.Functional.Tests.SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse [FAIL]
  System.TimeoutException : The operation has timed out.
  Stack Trace:
    /_/src/libraries/Common/tests/System/Net/Http/Http3LoopbackServer.cs(115,0): at System.Net.Test.Common.Http3LoopbackServerFactory.CreateServerAsync(Func`3 funcAsync, Int32 millisecondsTimeout, GenericLoopbackOptions options)
    /_/src/libraries/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs(1584,0): at System.Net.Http.Functional.Tests.DiagnosticsTest.SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse()
    --- End of stack trace from previous location ---

Error Message

DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

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

{
  "ErrorMessage": ["SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse [FAIL]", "System.TimeoutException"],
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1544854
Error message validated: [SendAsync_ReuseRequestInHandler_ResetsHeadersForEachReuse [FAIL] System.TimeoutException]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/10/2026 5:18:45 PM UTC

Report

Summary