Memory leak with static iterator types #91632

kumaraditya303 · 2022-04-17T10:27:05Z

Python does not finalizes iterators of some types at exit leading to memory leak.

Reproducer:

a = type(iter(tuple[int]))
print(a.mro())

Leak:

[<class 'generic_alias_iterator'>, <class 'object'>]
[119 refs, 46 blocks]

See also #90575

corona10 · 2022-04-17T12:00:50Z

cc @vstinner

vstinner · 2022-04-19T14:23:05Z

static PyTypeObject Py_GenericAliasIterType = {...} of Objects/genericaliasobject.c is not cleared at exit. It's a variant of https://bugs.python.org/issue46417

Either the type should be accessible in Objects/object.c for _PyTypes_FiniTypes() (remove "static", add "_" to hide the symbol). Or a _PyGenericAlias_Fini() function should be added in called in finalize_interp_types() in the main interpreter.

kumaraditya303 added interpreter-core (Objects, Python, Grammar, and Parser dirs) 3.11 bug and security fixes expert-C-API labels Apr 17, 2022

corona10 self-assigned this Apr 20, 2022

corona10 mentioned this issue Apr 20, 2022

gh-91632: Fix generic_alias_iterator to be finalized at exit. #91727

Merged

corona10 closed this as completed in #91727 Apr 20, 2022

corona10 added a commit that referenced this issue Apr 20, 2022

gh-91632: Fix generic_alias_iterator to be finalized at exit. (GH-91727)

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Memory leak with static iterator types #91632

Memory leak with static iterator types #91632

kumaraditya303 commented Apr 17, 2022 •

edited

corona10 commented Apr 17, 2022

vstinner commented Apr 19, 2022 •

edited

Memory leak with static iterator types #91632

Memory leak with static iterator types #91632

Comments

kumaraditya303 commented Apr 17, 2022 • edited

corona10 commented Apr 17, 2022

vstinner commented Apr 19, 2022 • edited

kumaraditya303 commented Apr 17, 2022 •

edited

vstinner commented Apr 19, 2022 •

edited