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Issue description

Environment

Minimal test code / Steps to reproduce the issue

Here are 2 python files:

# pub.py
import zmq
import time
c = zmq.Context.instance()
s = c.socket(zmq.PUB)
s.bind('ipc:///tmp/socket')
time.sleep(10)  # helps to run 2 processes simultaneously
s.send(b'42')

# sub.py
import zmq
c = zmq.Context.instance()
s = c.socket(zmq.SUB)
s.subscribe('')
s.connect('ipc:///tmp/socket')
while True:
    print(s.recv())

To reproduce the issue:

What's the actual result? (include assertion message & call stack if applicable)

sub.py received only one message (expected), but subsequent calls to pub.py will not cause sub.py to receive anything.

What's the expected result?

sub.py should notice that previously connected socket is closed, reconnect, and be able to receive messages from subsequent pub.py .