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_decimal: mpd_context_t::status/traps mutated non-atomically leading to data race

docsDocumentation in the Doc dirDocumentation in the Doc dir

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#149142 In python/cpython;

· devdanzin opened on Apr 29, 2026

itertools.zip_longest stores NULL in GC-tracked ittuple when iterators exhaust

extension-modulesC modules in the Modules dirC modules in the Modules dir

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#148181 In python/cpython;

· devdanzin opened on Apr 6, 2026

functools.lru_cache critical section locks self but _LockHeld dict APIs assert self->cache is locked

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-free-threading

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#148180 In python/cpython;

· devdanzin opened on Apr 6, 2026

Umbrella issue: code review reports from cpython-review-toolkit

extension-modulesC modules in the Modules dirC modules in the Modules dir

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#146103 In python/cpython;

· devdanzin opened on Mar 18, 2026

Umbrella issue: bugs found using cpython-review-toolkit

extension-modulesC modules in the Modules dirC modules in the Modules dir

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#146102 In python/cpython;

· devdanzin opened on Mar 18, 2026

NULL pointer dereference in FutureIter_am_send

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-asyncio

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#146065 In python/cpython;

· devdanzin opened on Mar 17, 2026

Assertion failures from _interpchannels._register_end_types

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-subinterpreters

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#127234 In python/cpython;

· devdanzin opened on Nov 24, 2024

tkinter.Tk segfault with invalid className

3.12only security fixesonly security fixes

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-tkinter

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#126219 In python/cpython;

· devdanzin opened on Oct 31, 2024