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The segfault occurs in a path in import.c that has a comment "XXX this
this should really not happen.":
Program received signal SIGSEGV, Segmentation fault.
0x000000000047d733 in type_dealloc (type=0x8381e0) at Objects/typeobject.c:2694
2694 _PyObject_GC_UNTRACK(type);
(gdb) bt
#0 0x000000000047d733 in type_dealloc (type=0x8381e0) at Objects/typeobject.c:2694
#1 0x000000000045d8ef in free_keys_object (keys=0x8eb810) at Objects/dictobject.c:374
#2 0x0000000000463513 in dict_dealloc (mp=0x8fa9c0) at Objects/dictobject.c:1392
#3 0x0000000000503118 in _PyImport_FixupExtensionObject (mod=0xa0cd40, name=0xb1fa90, 
 filename=0xb1fa90) at Python/import.c:498
(gdb) f 3
#3 0x0000000000503118 in _PyImport_FixupExtensionObject (mod=0xa0cd40, name=0xb1fa90, 
 filename=0xb1fa90) at Python/import.c:498
498 Py_DECREF(def->m_base.m_copy);
(gdb) l
493 if (def->m_size == -1) {
494 if (def->m_base.m_copy) {
495 /* Somebody already imported the module,
496 likely under a different name.
497 XXX this should really not happen. */
498 Py_DECREF(def->m_base.m_copy);
499 def->m_base.m_copy = NULL;
500 }
501 dict = PyModule_GetDict(mod);
502 if (dict == NULL)