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Crash when detaching dict from inline values and no memory is available #124547

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DinoVmarkshannon
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type-bugAn unexpected behavior, bug, or error
@DinoV

Description

@DinoV

Bug report

Bug description:

Add totest_class.py inTestInlineValues:

deftest_detach_materialized_dict_no_memory(self):a=WithAttrs()d=a.__dict___testcapi.set_nomemory(0)delaprint(d["a"])

This will crash because the dictionary will no longer points to valid memory:

#0  Py_XINCREF (op=<unknown at remote 0xdddddddddddddddd>) at ./Include/refcount.h:456#1  _Py_XNewRef (obj=<unknown at remote 0xdddddddddddddddd>) at ./Include/refcount.h:488#2  _Py_dict_lookup_threadsafe (mp=mp@entry=0x7ffff778ff50, key=key@entry='a', hash=<optimized out>, value_addr=value_addr@entry=0x7fffffffb078) at Objects/dictobject.c:1544#3  0x0000000000518457 in dict_subscript (self={'b': <unknown at remote 0xdddddddddddddddd>, 'd': <unknown at remote 0xdddddddddddddddd>, 'a': <unknown at remote 0xdddddddddddddddd>, 'c': <unknown at remote 0xdddddddddddddddd>}, key='a')    at Objects/dictobject.c:3325#4  0x000000000049d8c6 in PyObject_GetItem (o=o@entry={'b': <unknown at remote 0xdddddddddddddddd>, 'd': <unknown at remote 0xdddddddddddddddd>, 'a': <unknown at remote 0xdddddddddddddddd>, 'c': <unknown at remote 0xdddddddddddddddd>},    key=key@entry='a') at Objects/abstract.c:158

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

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