Tim Peters <t...@python.org> added the comment:
Thanks for the succinct example! Although you don't need the print() ;-)
I can confirm this crashes the same way under a current master build (albeit on
Windows 64-bit).
gc is calculating how many references in the current generation are accounted
for by intra-generation references, and gc's visit_decref() is getting called
back by odictobject.c's odict_traverse(), on line
Py_VISIT(od->od_weakreflist);
gc has found a second pointer to od->od_weakreflist, which is more than its
refcount (1) claims exist.
Python's weakref implementation gives me headaches, so I'm adding Raymond to
the nosy list under the hope the problem will be obvious to him.
----------
components: +Extension Modules -C API
nosy: +rhettinger, tim.peters
stage: -> needs patch
versions: +Python 3.7, Python 3.9
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<https://bugs.python.org/issue39778>
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