[issue17922] Crash in clear_weakref

[Antoine Pitrou]

Antoine Pitrou added the comment:

> swigpyobject_type is a static PyTypeObject variable (similar to all
> static PyTypeObject structures we write in extension modules, but
> inside a function)
> 
> It should never be deallocated... There may be a refcount issue with
> this object.

Even if it's deallocated, the Py_TYPE of an instance should never
become NULL. At worse it may point to invalid memory.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17922>
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