'WriteReqPool'.) (Cannot access a disposed object.

[benaadams]

During shutdown I received these errors (version 1.1.0-alpha1-22157)

Application is shutting down...

Unhandled Exception: System.AggregateException: One or more errors occurred. (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) (Cannot access a disposed object.
Object name: 'WriteReqPool'.) ---> System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'WriteReqPool'.
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Infrastructure.WriteReqPool.Allocate()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.SocketOutput.WriteContext.DoWriteIfNeeded()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.SocketOutput.WriteAllPending()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.KestrelThread.DoPostWork()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.KestrelThread.OnPost()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Networking.Libuv.NativeMethods.uv_run(UvLoopHandle handle, Int32 mode)
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Networking.Libuv.run(UvLoopHandle handle, Int32 mode)
   at Microsoft.AspNetCore.Server.Kestrel.Internal.KestrelThread.ThreadStart(Object parameter)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.KestrelThread.<StopAsync>d__45.MoveNext()
   --- End of inner exception stack trace ---
   at System.ThrowHelper.ThrowAggregateException(List`1 exceptions)
   at System.Threading.Tasks.Task.WaitAll(Task[] tasks, Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Internal.KestrelEngine.Dispose()
   at Microsoft.AspNetCore.Server.Kestrel.KestrelServer.Dispose()
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.Dispose()
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.Dispose()
   at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host, CancellationToken token, String shutdownMessage)
   at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host)
   at AgeOfAscent.Space.Program.Main(String[] args) in D:\Work\AgeOfAscent.Space.Build\Program.cs:line 32

[benaadams]

Was under very high load previously

[cesarblum]

I think we need to ensure the post work queue is empty before posting the WriteReqPool disposal.

[davidfowl]

Yep.

[cesarblum]

Seen on a test run too: https://travis-ci.org/aspnet/KestrelHttpServer/jobs/162047540#L1960

[ayende]

+1
I also just run into it, the server was under no load at all at the time.

[halter73]

@ayende Were you referencing Kestrel 1.1.0 from NuGet.org?

[ayende]

Yes, more specifically:

 "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",