Connecting through client hangs sometimes

Connecting to server through bin/client hangs sometimes. I'm attaching dump of the client process so you can see where it hangs. I'm observing two different cases.

When I try to connect few times it works and hangs from time to time.

When server is stopped, client fails with 'Connection reset by peer' message.

Command:
bin/client -u smx -p smx -v