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Python 3.14 stack overflow detection is incompatible with C++ Boost make_fcontext() coroutines

3.14bugs and security fixesbugs and security fixes

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

Status: Open.

#139653 In python/cpython;

· vstinner opened on Oct 6, 2025

Syntax warnings can be swallowed in import

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

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

Status: Open.

#139640 In python/cpython;

· serhiy-storchaka opened on Oct 6, 2025

Python 3.13: PyThreadState_SetAsyncExc might deliver the exception outside of the thread

3.13bugs and security fixesbugs and security fixes

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

topic-C-API

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

Status: Open.

#139622 In python/cpython;

· yilei opened on Oct 5, 2025

JIT executors are not properly freed

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

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

topic-JIT

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

Status: Open.

#139540 In python/cpython;

· YuanchengJiang opened on Oct 3, 2025

Parser gives UnicodeDecodeError on what should be good code

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

topic-parser

topic-unicode

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

Status: Open.

#139516 In python/cpython;

· tom-pytel opened on Oct 2, 2025

Py_C_STACK_SIZE causes <code>test_max_level</code> failure on musl/s390x

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

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

OS-unsupported

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

Status: Open.

#139467 In python/cpython;

· lotheac opened on Oct 1, 2025

Avoid blindly shadowing existing exceptions through <code>PyErr_Format</code>

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)

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#139447 In python/cpython;

· picnixz opened on Sep 30, 2025

Do not track immutable tuples in PyTuple_Pack

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#139389 In python/cpython;

· sergey-miryanov opened on Sep 28, 2025

Split large Objects/unicodeobject.c file into smaller files

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

topic-unicode

type-refactorCode refactoring (with no changes in behavior)Code refactoring (with no changes in behavior)

Status: Open.

#139353 In python/cpython;

· vstinner opened on Sep 26, 2025

Incorrect hard limit for stack protection for MacOS and TSAN

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

OS-mac

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

Status: Open.

#139291 In python/cpython;

· markshannon opened on Sep 24, 2025

JIT: UB: unaligned store in <code>patch_*</code> functions

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

topic-JIT

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

Status: Open.

#139269 In python/cpython;

· ashm-dev opened on Sep 23, 2025

JIT (interpreter): running hot code with <code>PYTHON_LLTRACE=4</code> segfaults

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.

#139193 In python/cpython;

· devdanzin opened on Sep 20, 2025