Ezio Melotti <ezio.melo...@gmail.com> added the comment:
I tracked this down a bit and this is what I found:
has_finalizer in Modules/gcmodule.c calls
return _PyInstance_Lookup(op, delstr) != NULL;
_PyInstance_Lookup in Modules/classobject.c calls
v = class_lookup(inst->in_class, name, &klass);
where inst is (PyInstanceObject *)op;
class_lookup in Modules/classobject.c eventually calls
PyObject *value = PyDict_GetItem(cp->cl_dict, name);
where cp is (PyClassObject *)inst->in_class
and since cp is not a valid pointer, cp->cl_dict results in the segfault after
a few recursive calls of class_lookup.
Confirmed that this only affects 2.7.
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nosy: +ezio.melotti
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<http://bugs.python.org/issue9751>
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