IIS-hosted application crashes when consuming a message

[Thibault Voisin]

Hi there,

I've got a WebApi2 application using MassTransit 3.0.11-beta with RabbitMq, and some hosting constraints for production applications, that leads me to use IIS to host this application.

The problem being, when I publish a message to the previously-mentioned, it instantly reboots and the following error appears in the EventViewer:

=====================

Exception: System.NullReferenceException

Message: Object reference not set to the instance of an object.

StackTrace:    at System.Web.ThreadContext.AssociateWithCurrentThread(Boolean setImpersonationContext)

   at System.Web.HttpApplication.OnThreadEnterPrivate(Boolean setImpersonationContext)

   at System.Web.LegacyAspNetSynchronizationContext.CallCallbackPossiblyUnderLock(SendOrPostCallback callback, Object state)

   at System.Web.LegacyAspNetSynchronizationContext.CallCallback(SendOrPostCallback callback, Object state)

   at System.Threading.Tasks.AwaitTaskContinuation.RunCallback(ContextCallback callback, Object state, Task& currentTask)

---  End of stack trace from previous location where exception was thrown ---

   at System.Threading.Tasks.AwaitTaskContinuation.<ThrowAsyncIfNecessary>b__1(Object s)

   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.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()

   at System.Threading.ThreadPoolWorkQueue.Dispatch()

===================================

The thing being, when I launch the application using self-hosting (Katana), everything works fine.

Here is the configuration for my service:

var busControl = Bus.Factory.CreateUsingRabbitMq(sbc =>

            {

                sbc.UseNLog();

                sbc.UseJsonSerializer();

                var uri = new Uri(string.Format("rabbitmq://{0}/{1}", _configuration.Host, _configuration.VirtualHost));

                var host = sbc.Host(uri, h =>

                {

                    h.Username(_configuration.Username);

                    h.Password(_configuration.Password);

                });

                sbc.ReceiveEndpoint(host, _configuration.QueueName, ep =>

                {

                    ep.UseConcurrencyLimit(1);

                    ep.PrefetchCount = 1;

                    ep.LoadFrom(_container);

                });

            });

            _busHandle = busControl.Start();

            _container.RegisterInstance<IBus>(busControl);

MassTransit starts correctly, and manages to connect to my local instance of RabbitMq, but the application crashes as soon as it receives a message.

Do you have any idea on what could be happening here? 

Thanks!

[Chris Patterson]

I'm not sure what could be happening, trust level issue with the IIS host?

Also, upgrade to .15 - it's been generally released for quite some time now! :)

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[Wayne Brantley]

Version 15 works pretty well.  Worth an upgrade to see if it fixes your issue above.

The issue looks to be around the synchronization context and I know there were lots of fixes for async (adding configureawait(false) everywhere) that could cause this.

If it does not fix it - does this all work fine if hosted as just a regular service with topshelf?

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[Thibault Voisin]

Thanks for the quick answer : it seems switching to version 15 fixes the problem, indeed. I'll do some additional testing, but it seems to work fine for now.

Thanks again!