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tarfile.TYarFile.add() does not normalize symlink targets on Windows

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

Status: Open.

#151669 In python/cpython;

· dnicolodi opened on Jun 18, 2026

LLVM libunwind bad-FDE warning for JIT frame registration with newer LLVM toolchains

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

Status: Open.

#151666 In python/cpython;

· DEVwXZ4Njdmo4hm opened on Jun 18, 2026

inspect.signature fails on TypeAliasType.evaluate_value

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-typing

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

Status: Open.

#151665 In python/cpython;

· sirosen opened on Jun 18, 2026

Data race between gc.get_stats() and a concurrent collection under free-threading

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

topic-free-threading

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

Status: Open.

#151646 In python/cpython;

· Naserume opened on Jun 18, 2026

Data race in _PyImport_SetDLOpenFlags when sys.setdlopenflags() is called concurrently

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

topic-free-threading

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

Status: Open.

#151644 In python/cpython;

· Naserume opened on Jun 18, 2026

Data race between resize_buffer_lock_held and _Py_DecRefShared on a shared BytesIO buffer

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.

#151640 In python/cpython;

· Naserume opened on Jun 18, 2026

Concurrent calls to Counter.update can cause a use after free

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.

#151633 In python/cpython;

· KowalskiThomas opened on Jun 18, 2026

_find_incompatible_extension_module raises ModuleNotFoundError when sys.modules contains None for the parent package

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

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

Status: Open.

#151631 In python/cpython;

· hroncok opened on Jun 18, 2026

Crash (use-after-free) in odictiter_new when an OrderedDict is concurrently iterated and updated/cleared

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

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.

#151627 In python/cpython;

· Naserume opened on Jun 18, 2026

Some tests fail when __pycache__ prefix is set

testsTests in the Lib/test dirTests in the Lib/test dir

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

Status: Open.

#151626 In python/cpython;

· ringobanana-3900 opened on Jun 18, 2026

3.15.0b2, openSUSE/Factory, s390x: failing test: test_os (test_timerfd_ns_poll)

OS-linux

testsTests in the Lib/test dirTests in the Lib/test dir

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

Status: Open.

#151622 In python/cpython;

· mcepl opened on Jun 18, 2026

Non-module namespaces don't watch for lazy imports

3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes

3.16new features, bugs and security fixesnew features, bugs and security fixes

topic-lazy-imports

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

Status: Open.

#151619 In python/cpython;

· brandtbucher opened on Jun 18, 2026