[issue28883] Python 3.5.2 crashers (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(C4) faulthandler: register(): the signal handler, faulthandler_user(),
  changes errno in faulthandler_dump_traceback() but fails to restore it
  if chain=False.  This can rarely cause random nonsense in the main
  program.

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<http://bugs.python.org/issue28883>
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