Issues

• Avoid redundant garbage collector traversals

  3.16interpreter-coreperformancetype-feature
  python/cpython#159437 · Filter by author mfalco-oai opened on Oct 14, 2026
  3

  

• tarfile: a pax size record followed by a GNU long-name header makes tarfile duplicate, invent or skip members

  stdlibtype-bug
  python/cpython#159435 · Filter by author gpshead opened on Oct 14, 2026

• Function __annotations__ can cache a stale result from __annotate__

  interpreter-coretype-bug
  python/cpython#159434 · Filter by author nascheme opened on Oct 14, 2026
  1

• _PyObject_XDecRefDelayed() should handle immortal objects

  interpreter-coretopic-free-threadingtype-bug
  python/cpython#159431 · Filter by author nascheme opened on Oct 14, 2026

• Some missing error checks on _PyObject_LookupSpecial in bytes and weakref

  interpreter-coretype-bug
  python/cpython#159430 · Filter by author msullivan opened on Oct 14, 2026

• Don't load from mimetypes.knownfiles by default on Windows

  stdlibtype-bugtype-security
  python/cpython#159428 · Filter by author sethmlarson opened on Oct 14, 2026

• test_free_threading.test_zlib fails on s390x with hardware zlib accelerator

  stdlibtests
  python/cpython#159425 · Filter by author vstinner opened on Oct 14, 2026

• test_readline fails with libeditline+musl

  3.14extension-modulestype-bug
  python/cpython#159424 · Filter by author rossburton opened on Oct 14, 2026

• Fix possible dataloss during finalization with GzipFile

  stdlibtype-bug
  python/cpython#159422 · Filter by author brittanyrey opened on Oct 14, 2026

• 3.16.0a1: test_build_details is not ready for --with-build-details-suffix configure option

  teststype-bug
  python/cpython#159420 · Filter by author befeleme opened on Oct 14, 2026

• forkserver throws a TypeError if default SIGINT handler is not used

  stdlibtopic-multiprocessingtype-bug
  python/cpython#159418 · Filter by author itrowbri opened on Oct 14, 2026

• Segfault on re-entrant lazy import pandas

  interpreter-coretopic-lazy-importstype-crash
  python/cpython#159408 · Filter by author inoa-jboliveira opened on Oct 14, 2026
  1

• SystemExit in asyncio task raises noisy warnings

  stdlibtopic-asynciotype-bug
  python/cpython#159401 · Filter by author marcan opened on Oct 14, 2026
  6

• Free-threading: codecs.encode() crashes when a codec search function is unregistered concurrently

  interpreter-coretopic-free-threadingtype-crash
  python/cpython#159399 · Filter by author christianaurichzm opened on Oct 14, 2026

• test_profiling.test_sampling_profiler: Assertion failed: maxchar <= 0x10ffff on ARM64 Raspbian 3.x

  extension-modulestopic-profilingtype-bug
  python/cpython#159398 · Filter by author vstinner opened on Oct 14, 2026
  

• pathlib fast-copy can silently produce an empty destination after a zero-byte syscall

  stdlibtopic-pathlibtype-bug
  python/cpython#159395 · Filter by author mhatipog opened on Oct 14, 2026

• test_curses regression in 3.16.0a1: test_newterm fails on a real terminal that's not 80x25

  teststopic-cursestype-bug
  python/cpython#159394 · Filter by author mgorny opened on Oct 14, 2026

• Add Free Threaded builds for Android

  OS-androidtopic-free-threadingtype-feature
  python/cpython#159393 · Filter by author freakboy3742 opened on Oct 14, 2026

• test_ssl.test_shared_ciphers fails when OpenSSL 4.0 enables the TLS 1.3 SM4 cipher suites

  teststopic-SSLtype-bug
  python/cpython#159391 · Filter by author lpyu001 opened on Oct 14, 2026

• ssl.HAS_TLSv1_2 is False with OpenSSL 4.0 although TLS 1.2 connections work

  extension-modulestopic-SSLtype-bug
  python/cpython#159387 · Filter by author lpyu001 opened on Oct 14, 2026

• No audit hook for sys.monitoring tools being cleared / freed

  interpreter-coretype-feature
  python/cpython#159379 · Filter by author godlygeek opened on Oct 13, 2026
  1

• codeop incomplete-input warning test invokes the compiler outside warning capture

  teststype-bug
  python/cpython#159362 · Filter by author esadomer opened on Oct 13, 2026
  4

• Pickle closed-file loading test exercises dumping instead of loading

  teststype-bug
  python/cpython#159361 · Filter by author esadomer opened on Oct 13, 2026

• pstats.Stats.add leaves cached callee relationships stale

  stdlibtype-bug
  python/cpython#159358 · Filter by author esadomer opened on Oct 13, 2026

• Forward errors to fileinput hooks without an explicit encoding

  stdlibtype-bug
  python/cpython#159356 · Filter by author esadomer opened on Oct 13, 2026