[issue17922] Crash in clear_weakref

[Jan Safranek]

Jan Safranek added the comment:

> Could you try to inspect the `self` variable inside weakref_dealloc,
> especially `self->wr_object` and its Py_TYPE() value? Also, what is the
> value of Py_REFCNT(self->wr_object)?

in weakref_dealloc at Objects/weakrefobject.c:106:

(gdb) p *self
$1 = {_ob_next = 0x0, _ob_prev = 0x0, ob_refcnt = 0, ob_type = 0x7fdb8ffc91a0 <_PyWeakref_RefType>}

(gdb) p *((PyWeakReference*)self)
$7 = {_ob_next = 0x0, _ob_prev = 0x0, ob_refcnt = 0, ob_type = 0x7fdb8ffc91a0 <_PyWeakref_RefType>, wr_object = 0x7fdb9c30bc00 <swigpyobject_type.9541>, wr_callback = 0x0, hash = -1, 
  wr_prev = 0x0, wr_next = 0x0}

(gdb) p *((PyWeakReference*)self)->wr_object
$9 = {_ob_next = 0x0, _ob_prev = 0x0, ob_refcnt = 0, ob_type = 0x0}

If I am reading Py_TYPE right, Py_TYPE(self->wr_object) must be 0 (=NULL).

<swigpyobject_type.9541> seems to be PyTypeObject generated by SWIG in cmpi-bindings, I'll dig into it. Please let me know if there is anything suspicious or worth checking.

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