[issue28673] pyro4 with more than 15 threads often crashes 2.7.12

[INADA Naoki]

INADA Naoki added the comment:

Python 3 would have #21963 too. If we can fix it, we can fix this issue
too.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28673>
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