Armin Rigo added the comment:

(C6) I didn't try, but it seems that typeobject.c:mro_internal() is prone
  to a refcount crash.  It does this::

     old_mro = type->tp_mro;
     ...mro_invoke()...  /* might cause reentrance */
     type->tp_mro = new_mro;
     ...
     Py_XDECREF(old_mro);

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28883>
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