[issue44588] Possible double Py_XDECREF in cpython typeobject.c

[Ziyue Jiang]

Ziyue Jiang <ziyue.jiang97 at gmail.com> added the comment:

I have no detailed code. The way to I produce it is that using PyType_FromSpec() to generate a type A without the flag Py_TPFLAGS_DEFAULT(which sets the flag Py_TPFLAGS_HAVE_VERSION_TAG).

Then compile and run in Python.

from my_pkg import A
class Time1(Time):
    def __init__(self):
        pass

import multiprocessing (This import is a method to 100% reproduce it. Another way is to use python3-dbg running the code.)

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