[issue4106] multiprocessing occasionally spits out exception during shutdown

[Jesse Noller]

Jesse Noller <jnoller at gmail.com> added the comment:

On Tue, Jan 18, 2011 at 6:23 PM, Brian Thorne <report at bugs.python.org> wrote:
>
> Brian Thorne <hardbyte at gmail.com> added the comment:
>
> With the example script attached I see the exception every time. On Ubuntu 10.10 with Python 2.6
>
> Since the offending line in multiprocesing/queues.py (233) is a debug statement, just commenting it out seems to stop this exception.
>
> Looking at the util file shows the logging functions to be all of the form:
>
>    if _logger:
>        _logger.log(...
>
> Could it be possible that after the check the _logger global (or the debug function) is destroyed by the exit handler? Can we convince them to stick around until such a time that they cannot be called?
>
> Adding a small delay before joining also seems to work, but is ugly. Why should another Process *have* to have a minimum amount of work to not throw an exception?

See http://bugs.python.org/issue9207 - but yes, the problem is that
the VM is nuking our imported modules before all the processes are
shutdown.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4106>
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