Yury Selivanov added the comment:
> Why are you using 20000 threads?
That's a good question.
In any case it looks like self-pipe sock's buffer was overflown because
call_soon_threadsafe was called too many times, and loop._read_from_self
couldn't empty the buffer promptly. Then, at some point, _write_to_self failed
with an IOError.
It looks like this was fixed for the selector loop, but not for proactor:
selector_events.py:
def _write_to_self(self):
csock = self._csock
if csock is not None:
try:
csock.send(b'\0')
except OSError:
if self._debug:
logger.debug("Fail to write a null byte into the "
"self-pipe socket",
exc_info=True)
proactor_events.py:
def _write_to_self(self):
self._csock.send(b'\0')
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<http://bugs.python.org/issue23846>
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