[3.10] bpo-46417: Fix race condition on setting type __bases__ (GH-30788)#30789
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Fix a race condition on setting a type __bases__ attribute: the internal function add_subclass() now gets the PyTypeObject.tp_subclasses member after calling PyWeakref_NewRef() which can trigger a garbage collection which can indirectly modify PyTypeObject.tp_subclasses. (cherry picked from commit f1c6ae3) Co-authored-by: Victor Stinner <vstinner@python.org>
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Fix a race condition on setting a type bases attribute: the
internal function add_subclass() now gets the
PyTypeObject.tp_subclasses member after calling PyWeakref_NewRef()
which can trigger a garbage collection which can indirectly modify
PyTypeObject.tp_subclasses.
(cherry picked from commit f1c6ae3)
Co-authored-by: Victor Stinner vstinner@python.org
https://bugs.python.org/issue46417