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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).
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(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)
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