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JIT: Assertion PyType_Check((PyObject *)type) failed

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

topic-JIT

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

Status: Open.

#149112 In python/cpython;

· devdanzin opened on Apr 28, 2026

Assertion failure: !_PyFrame_IsIncomplete(frame->f_frame)

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

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

Status: Open.

#149110 In python/cpython;

· devdanzin opened on Apr 28, 2026

JIT: Assertion failure Stack underflow (depth = -1)

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

topic-JIT

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

Status: Open.

#149049 In python/cpython;

· devdanzin opened on Apr 27, 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

JIT: Assertion next_instr->op.code == STORE_FAST failed in _PyEval_EvalFrameDefault

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

topic-JIT

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

Status: Open.

#143820 In python/cpython;

· devdanzin opened on Jan 14, 2026

JIT: Assertion size < MAX_EXECUTORS_SIZE failed in get_index_for_executor

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

topic-JIT

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

Status: Open.

#143807 In python/cpython;

· devdanzin opened on Jan 13, 2026

JIT: executor->vm_data.valid assertion failure in unlink_executor

3.14bugs and security fixesbugs and security fixes

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

topic-JIT

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

Status: Open.

#136996 In python/cpython;

· devdanzin opened on Jul 22, 2025

Abort from calling OrderedDict.setdefault with an invalid value

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

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

Status: Open.

#132461 In python/cpython;

· devdanzin opened on Apr 13, 2025