[issue23433] undefined behaviour in faulthandler.c, exposed by GCC 5

[Roundup Robot]

Roundup Robot added the comment:

New changeset 689092296ad3 by Victor Stinner in branch '3.4':
Issue #23433: Fix faulthandler._stack_overflow()
https://hg.python.org/cpython/rev/689092296ad3

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nosy: +python-dev

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<http://bugs.python.org/issue23433>
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