Nelson Minar added the comment:

Doing some more testing, I noticed that if I ask multiprocessing to also log, 
the problem stops occurring. If I configure multiprocessing.log_to_stderr() 
instead, the error still occurs. 

Here's how I configured multiprocessing logging that makes the problem go away. 
This goes right at the top of the main() function.

    mp_logger = multiprocessing.get_logger()
    mp_logger.propagate=True
    mp_logger.setLevel(logging.DEBUG)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23278>
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