c# - How to debug "Cannot close an uninitialised Msg" FaultException? -

my app crashing because of "cannot close uninitialised msg" unhandled exception. due access socket multiple threads.

and have problem debugging issue because when review code access socket done in poller thread -- either in receiveready event handler directly (which run on poller thread definition understand it) or in manually created task (new task(...)) , started on poller thread (task.start(poller)). don't see place happen.

second problem is unhandled exception -- wrap sending/receiving in try-catch, yet exception happen somewhere outside.

i looking ways how debug , pinpoint place in code misbehaves.

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code examples -- wrote use 2 "patterns":

using poller thread directly (thanks events fired on poller's thread):

 private async void onmessagereceiveready(object sender, netmqsocketeventargs args)  {      netmqsocket socket = args.socket;       netmqmessage mq_msg = socket.receivemultipartmessage();      ... 

switching poller's thread arbitrary thread:

task sending = new task(() => {     foreach (netmqframe address in mq_envelope)         socket.sendmoreframe(address.converttostring());      socket.sendframe(response_data); }); sending.start(this.sharedpoller); await sending.configureawait(false); 

unfortunately didn't find other method trial&error , more logging.

and problem disposing sockets -- have running poller (shared) , tried remove , dispose socket, found out 2 methods asynchronous.

as solution group remove , dispose in separate task , schedule run in poller. having task in hand can call wait on , way achieve blocking, synchronous behaviour in dispose.