STINNER Victor <vstin...@python.org> added the comment:

> For example, PyModule_Type is declared statically and so shared by all 
> interpreters and so PyModule_Type.tp_mro tuple is accessed in parallel by 
> multiple interpreters.

Another example of this issue are parallel Py_INCREF/Py_DECREF calls on the 
tp_bases member of a type.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40533>
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