New submission from anon01 :
When I run this code (on a UNIX system with temporary directory `/tmp/`):
```
from multiprocessing import connection
import threading
key=b"1"
def run():
c=connection.Client("/tmp/xxx", authkey=key)
c.send("data")
l=connection.Listener("/tmp/xxx", authkey=key)
threading.Thread(target=run).start()
c=l.accept()
print("receive", c.recv())
```
it prints out "receive data" normally.
However, in the special case that `key=b""` the doesn't print anything, and can
only be interrupted with Ctrl+C.
`key=None` doesn't have that issue.
Note that this issue does happen when the client uses the key `b""` and the
server uses the key `None`, but the program works normally if the reverse
situation.
Python version: Python 3.9.3.
--
components: Library (Lib)
messages: 392056
nosy: anon01
priority: normal
severity: normal
status: open
title: Multiprocessing UNIX socket connection: client freeze if authkey is an
empty byte string
versions: Python 3.9
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<https://bugs.python.org/issue43952>
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