Greg Brockman <g...@ksplice.com> added the comment:

With pool.py:272 commented out, running about 50k iterations, I saw 4 
tracebacks giving an exception on pool.py:152.  So this seems to imply the race 
does exist (i.e. that the thread is in _maintain_pool rather than time.sleep 
when shutdown begins).  It looks like the _maintain_pool run takes O(10^-4)s, 
so it's not surprising the error is so rare.

That being said, the patch I submitted in issue 9205 should handle this case as 
well.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9207>
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