.net core 2 with MassTransit 4(all versions) channel storm?

[Tim Bolz]

We have been using MassTransit in production for a few years, versions 2 & 3, and we have had great success with it.  

We have recently stood up a few .net core 2 services and have tried MassTransit 4.0.0, as well as a few of the v4.*-develop versions that are out there.  when messages are processed without error we haven't experienced any issues.

However, when we have run across an error while processing a message we have seen unexpected results.  Retry logic seems to be functional, however, channels seem to spawn out of control.  

Here is a simple unit test as an example:

            var waitHandle = new AutoResetEvent(false);

            var messageCReceived = false;

            MessageCConsumer.MessageCReceived += (sender, args) =>

            {

                messageCReceived = true;

                waitHandle.Set();

                throw (new Exception("test error"));

            };

            

            MassTransitBus.CreateBus(GetConfigTestValue(), (sbc, host) =>

            {

                sbc.ReceiveEndpoint(host, "SpamErrorTest_Receive_SubscriptionC", ep =>

                {

                    ep.Consumer<MessageCConsumer>();

                });

            });

            

            for (int i = 0; i < 100; i++)

            { 

                await MassTransitBus.Publish(new MessageC { Name = "GreatMessage" });

             }

            var didNotTimeout = waitHandle.WaitOne(5);

With that example of sending 100 messages, if we comment out the throw line, we complete the code with 1 publish channel.  however, when we throw the exception during processing.  we've seen the channel count for the single connection increase from 1 publish channel to somewhere between 27 and 51 publish channels associated to the single connection.  

I saw it referred to as Channel Storm in a few older posts from older versions of the package.  Could this have been re-introduced in this version of the library?  

Thanks for your time