Test failure: SmallConnectionLifetimeWithMaxConnections_PendingRequestUsesDifferentConnection

[MihaZupan]

System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_MaxConnectionsPerServer_Test.SmallConnectionLifetimeWithMaxConnections_PendingRequestUsesDifferentConnection(lifetimeMilliseconds: 0) [FAIL]
      System.Threading.Tasks.TaskCanceledException : The request was canceled due to the configured HttpClient.Timeout of 100 seconds elapsing.
      ---- System.TimeoutException : The operation was canceled.
      -------- System.Threading.Tasks.TaskCanceledException : The operation was canceled.
      ------------ System.IO.IOException : Unable to read data from the transport connection: Operation canceled.
      ---------------- System.Net.Sockets.SocketException : Operation canceled
      Stack Trace:
        /_/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs(716,0): at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs(188,0): at System.Net.Http.HttpClient.GetStringAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs(202,0): at System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_MaxConnectionsPerServer_Test.<>c__DisplayClass1_2.<<SmallConnectionLifetimeWithMaxConnections_PendingRequestUsesDifferentConnection>b__1>d.MoveNext()
        --- End of stack trace from previous location ---
        /_/src/libraries/Common/tests/System/Net/Http/LoopbackServer.cs(123,0): at System.Net.Test.Common.LoopbackServer.AcceptConnectionAsync(Func`2 funcAsync)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs(187,0): at System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_MaxConnectionsPerServer_Test.<>c__DisplayClass1_1.<<SmallConnectionLifetimeWithMaxConnections_PendingRequestUsesDifferentConnection>b__0>d.MoveNext()
        --- End of stack trace from previous location ---
        /_/src/libraries/Common/tests/System/Net/Http/LoopbackServer.cs(71,0): at System.Net.Test.Common.LoopbackServer.CreateServerAsync(Func`2 funcAsync, Options options)
        /_/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs(182,0): at System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_MaxConnectionsPerServer_Test.SmallConnectionLifetimeWithMaxConnections_PendingRequestUsesDifferentConnection(Int32 lifetimeMilliseconds)
        --- End of stack trace from previous location ---
        ----- Inner Stack Trace -----
        
        ----- Inner Stack Trace -----
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnection.cs(764,0): at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnectionPool.cs(876,0): at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(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(677,0): at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellationToken)
        ----- Inner Stack Trace -----
        /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Tasks.cs(917,0): at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
        /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Tasks.cs(883,0): at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnection.cs(1565,0): at System.Net.Http.HttpConnection.FillAsync(Boolean async)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnection.cs(1510,0): at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean async, Boolean foldedHeadersAllowed)
        /_/src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnection.cs(541,0): at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
        ----- Inner Stack Trace -----

Failed only once in August and once in September.

[ghost]

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[karelz]

No failure in main/master branch in last 2 months: 2/23-4/23.

[karelz]

No failures during 2/23-5/10 (incl. PRs). Closing.