New submission from appidman:
I use paramiko to create SSH sessions to Linux machines, which works great 95%
of the time. But sometimes, the Python process which creates the SSH session
hangs forever in wait() of threading.py (see attachment 'gdb.txt' for full
output).
{code}
(gdb) py-list
239 waiter.acquire()
240 self.__waiters.append(waiter)
241 saved_state = self._release_save()
242 try: # restore state no matter what (e.g.,
KeyboardInterrupt)
243 if timeout is None:
>244 waiter.acquire()
245 if __debug__:
246 self._note("%s.wait(): got it", self)
247 else:
248 # Balancing act: We can't afford a pure busy loop, so
we
249 # have to sleep; but if we sleep the whole timeout time,
(gdb) py-bt
#5 Frame 0xb459a5c, for file /usr/lib/python2.7/threading.py, line 244, in wait
(self=<_Condition(_Verbose__verbose=False, _Condition__lock=<thread.lock at
remote 0xaf7e3a0>, acquire=<built-in method acquire of thread.lock object at
remote 0xaf7e3a0>, _Condition__waiters=[<thread.lock at remote 0xaf7e100>],
release=<built-in method release of thread.lock object at remote 0xaf7e3a0>) at
remote 0xb73708c>, timeout=None, waiter=<thread.lock at remote 0xaf7e100>,
saved_state=None)
waiter.acquire()
#9 Frame 0xb66118c, for file
/usr/lib/python2.7/dist-packages/paramiko/buffered_pipe.py, line 137, in read
(self=<BufferedPipe(_closed=False, _lock=<thread.lock at remote 0xaf7e3a0>,
_buffer=<array.array at remote 0xb737ea0>, _event=None,
_cv=<_Condition(_Verbose__verbose=False, _Condition__lock=<thread.lock at
remote 0xaf7e3a0>, acquire=<built-in method acquire of thread.lock object at
remote 0xaf7e3a0>, _Condition__waiters=[<thread.lock at remote 0xaf7e100>],
release=<built-in method release of thread.lock object at remote 0xaf7e3a0>) at
remote 0xb73708c>) at remote 0xb737a4c>, nbytes=8192, timeout=None, out='',
then=<float at remote 0xb57efe4>)
self._cv.wait(timeout)
{code}
----------
components: Library (Lib)
files: gdb.txt
messages: 241806
nosy: appidman
priority: normal
severity: normal
status: open
title: Python hangs forever in wait() of threading.py
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file39167/gdb.txt
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24026>
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