System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_AltSvc_Test_Http3.AltSvc_Header_Upgrade_Success failing with timout

[adamsitnik]

System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_AltSvc_Test_Http3.AltSvc_Header_Upgrade_Success(fromVersion: 1.1, overrideHost: True) [FAIL]
      System.TimeoutException : The operation has timed out.
      Stack Trace:
        /_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(55,0): at System.Threading.Tasks.TaskTimeoutExtensions.WhenAllOrAnyFailed(Task[] tasks, Int32 millisecondsTimeout)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.AltSvc.cs(137,0): at System.Net.Http.Functional.Tests.HttpClientHandler_AltSvc_Test.AltSvc_Upgrade_Success(GenericLoopbackServer firstServer, Http3LoopbackServer secondServer, HttpClient client)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.AltSvc.cs(64,0): at System.Net.Http.Functional.Tests.HttpClientHandler_AltSvc_Test.AltSvc_Header_Upgrade_Success(Version fromVersion, Boolean overrideHost)
        --- End of stack trace from previous location ---
    System.Net.Http.Functional.Tests.SocketsHttpHandlerTest_HttpClientHandlerTest_Headers_Http3.SendAsync_UserAgent_CorrectlyWritten [FAIL]
      System.Net.Http.HttpRequestException : Connection handshake was canceled due to the configured timeout of 00:00:10 seconds elapsing. (127.0.0.1:52560)
      ---- System.Net.Quic.QuicException : Connection handshake was canceled due to the configured timeout of 00:00:10 seconds elapsing.
      Stack Trace:
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectHelper.cs(134,0): at System.Net.Http.ConnectHelper.ConnectQuicAsync(HttpRequestMessage request, DnsEndPoint endPoint, TimeSpan idleTimeout, SslClientAuthenticationOptions clientAuthenticationOptions, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectionPool/HttpConnectionPool.Http3.cs(162,0): at System.Net.Http.HttpConnectionPool.GetHttp3ConnectionAsync(HttpRequestMessage request, HttpAuthority authority, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectionPool/HttpConnectionPool.Http3.cs(174,0): at System.Net.Http.HttpConnectionPool.GetHttp3ConnectionAsync(HttpRequestMessage request, HttpAuthority authority, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectionPool/HttpConnectionPool.Http3.cs(85,0): at System.Net.Http.HttpConnectionPool.TrySendUsingHttp3Async(HttpRequestMessage request, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectionPool/HttpConnectionPool.cs(430,0): at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/RedirectHandler.cs(30,0): at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs(530,0): at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs(550,0): at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Headers.cs(63,0): at System.Net.Http.Functional.Tests.HttpClientHandlerTest_Headers.<>c__DisplayClass3_0.<<SendAsync_UserAgent_CorrectlyWritten>b__0>d.MoveNext()
        --- End of stack trace from previous location ---
        /_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(120,0): at System.Threading.Tasks.TaskTimeoutExtensions.GetRealException(Task task)
        --- End of stack trace from previous location ---
        /_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(90,0): at System.Threading.Tasks.TaskTimeoutExtensions.WhenAllOrAnyFailed(Task[] tasks)
        /_/src/libraries/Common/tests/System/Net/Http/GenericLoopbackServer.cs(44,0): at System.Net.Test.Common.LoopbackServerFactory.<>c__DisplayClass6_0.<<CreateClientAndServerAsync>b__0>d.MoveNext()
        --- End of stack trace from previous location ---
        /_/src/libraries/Common/tests/System/Net/Http/Http3LoopbackServer.cs(116,0): at System.Net.Test.Common.Http3LoopbackServerFactory.CreateServerAsync(Func`3 funcAsync, Int32 millisecondsTimeout, GenericLoopbackOptions options)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Headers.cs(57,0): at System.Net.Http.Functional.Tests.HttpClientHandlerTest_Headers.SendAsync_UserAgent_CorrectlyWritten()
        --- End of stack trace from previous location ---
        ----- Inner Stack Trace -----
        /_/src/libraries/System.Net.Quic/src/System/Net/Quic/QuicConnection.cs(89,0): at System.Net.Quic.QuicConnection.<ConnectAsync>g__StartConnectAsync|2_0(QuicClientConnectionOptions options, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectHelper.cs(121,0): at System.Net.Http.ConnectHelper.ConnectQuicAsync(HttpRequestMessage request, DnsEndPoint endPoint, TimeSpan idleTimeout, SslClientAuthenticationOptions clientAuthenticationOptions, CancellationToken cancellationToken)

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=654860
Build error leg or test failing: System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_AltSvc_Test_Http3.AltSvc_Header_Upgrade_Success
Pull request: #100094

Error Message

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

{
  "ErrorMessage": [ "System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_AltSvc_Test_Http3.AltSvc_Header_Upgrade_Success", "System.TimeoutException" ],
  "ErrorPattern": "",,
  "ErrorPattern": "",
  "BuildRetry": true,
  "ExcludeConsoleLog": false
}

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[adamsitnik]

Closing in favour of #101505 (I must have messed up sth and the bot does not pick up my changes)