ObjectDisposedException in System.Net.WebSockets.ClientWebSocket

[jcondex]

I got the following exception in our Peer2Peer scaleout scenario test using ServiceBus as the backplane.

The test ran on 2 machines with 1000 connections on each.

I don't know if this happens without scaleout, but from what I remember I have never seen it before.

System.AggregateException: One or more errors occurred. ---> System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.WebSockets.ClientWebSocket'.
   at System.Net.WebSockets.ClientWebSocket.CloseOutputAsync(WebSocketCloseStatus closeStatus, String statusDescription, CancellationToken cancellationToken)
   at Microsoft.AspNet.SignalR.WebSockets.WebSocketHandler.<CloseAsync>b__2(Object state) in c:\Users\jconde\Documents\GitHub\SignalR\src\Microsoft.AspNet.SignalR.Core\Owin\WebSockets\WebSocketHandler.cs:line 104
   at Microsoft.AspNet.SignalR.Infrastructure.TaskQueue.<Enqueue>b__1(Func`2 next, Object nextState) in c:\Users\jconde\Documents\GitHub\SignalR\src\Microsoft.AspNet.SignalR.Core\Infrastructure\TaskQueue.cs:line 88
   at Microsoft.AspNet.SignalR.TaskAsyncHelper.FromMethod[T1,T2](Func`3 func, T1 arg1, T2 arg2) in c:\Users\jconde\Documents\GitHub\SignalR\src\Microsoft.AspNet.SignalR.Core\TaskAsyncHelper.cs:line 731
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at SignalR.Stress.Scaleout.ServerBroadcastAll.Program.ConnectToOneOfTheHubsAndInvokeBroadcastAll() in c:\SignalR\Offcycle\WPT\SignalR\Main\stress\SignalR.Stress.Scaleout.ServerBroadcastAll\SignalR.Stress.Scaleout.ServerBroadcastAll\Program.cs:line 179
   at SignalR.Stress.Scaleout.ServerBroadcastAll.Program.BroadcastAll() in c:\SignalR\Offcycle\WPT\SignalR\Main\stress\SignalR.Stress.Scaleout.ServerBroadcastAll\SignalR.Stress.Scaleout.ServerBroadcastAll\Program.cs:line 118
   at Microsoft.Test.Stress.StressTest.MethodInvokerCache.Invoke(Object instance, MethodInfo method) in c:\Stress\src\Microsoft.Test.Stress\StressTest.cs:line 1156
   at Microsoft.Test.Stress.StressTest.InvokeMethod(Object instance, MethodInfo method, Int32 timeoutInSeconds) in c:\Stress\src\Microsoft.Test.Stress\StressTest.cs:line 602
   at Microsoft.Test.Stress.VariationInvoker.InvokeWithExtendedMetrics() in c:\Stress\src\Microsoft.Test.Stress\VariationInvoker.cs:line 156
   at Microsoft.Test.Stress.VariationInvoker.InvokeVariationMethod() in c:\Stress\src\Microsoft.Test.Stress\VariationInvoker.cs:line 145
   at Microsoft.Test.Stress.VariationInvoker.Invoke() in c:\Stress\src\Microsoft.Test.Stress\VariationInvoker.cs:line 97
   at Microsoft.Test.Stress.StressThreadRuntime.Run() in c:\Stress\src\Microsoft.Test.Stress\StressThreadRuntime.cs:line 101
   at Microsoft.Test.Stress.StressThreadRuntime.Execute() in c:\Stress\src\Microsoft.Test.Stress\StressThreadRuntime.cs:line 46
   at Microsoft.Test.Stress.StressTest.StressThreadProc(Object contextIdAndTimeToLiveTuple) in c:\Stress\src\Microsoft.Test.Stress\StressTest.cs:line 866
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart(Object obj)
---> (Inner Exception #0) System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.WebSockets.ClientWebSocket'.
   at System.Net.WebSockets.ClientWebSocket.CloseOutputAsync(WebSocketCloseStatus closeStatus, String statusDescription, CancellationToken cancellationToken)
   at Microsoft.AspNet.SignalR.WebSockets.WebSocketHandler.<CloseAsync>b__2(Object state) in c:\Users\jconde\Documents\GitHub\SignalR\src\Microsoft.AspNet.SignalR.Core\Owin\WebSockets\WebSocketHandler.cs:line 104
   at Microsoft.AspNet.SignalR.Infrastructure.TaskQueue.<Enqueue>b__1(Func`2 next, Object nextState) in c:\Users\jconde\Documents\GitHub\SignalR\src\Microsoft.AspNet.SignalR.Core\Infrastructure\TaskQueue.cs:line 88
   at Microsoft.AspNet.SignalR.TaskAsyncHelper.FromMethod[T1,T2](Func`3 func, T1 arg1, T2 arg2) in c:\Users\jconde\Documents\GitHub\SignalR\src\Microsoft.AspNet.SignalR.Core\TaskAsyncHelper.cs:line 731<---

[jcondex]

I'm also seeing this in non-scaleout tests

[signalrcoreteam]

@jcondex Can you provide repro steps?

[davidfowl]

@jcondex I'll assign this to you as well. Seems like your change to websockets fixes this as well.