[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 42aecc601a41 by Antoine Pitrou in branch 'default':
Back out 5bd9db528aed (issue #18408).  It caused unsolved buildbot failures.
http://hg.python.org/cpython/rev/42aecc601a41

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18408>
_______________________________________