Issues

• GitHub Action: "Tail calling interpreter" times out after 60 minutes on macOS x86_64 on building LLVM from source

  buildOS-mac
  python/cpython#159612 · Filter by author vstinner opened on Oct 17, 2026
  1

• test_largefile hangs on x86-64 MacOS Intel ASAN NoGIL buildbot

  OS-macteststype-bug
  python/cpython#159608 · Filter by author vstinner opened on Oct 17, 2026
  1

• test_faulthandler fails randomly on x86-64 MacOS Intel ASAN NoGIL 3.x

  OS-macteststype-bug
  python/cpython#159606 · Filter by author vstinner opened on Oct 17, 2026
  3

• Implement stack size detection on FreeBSD

  interpreter-coreOS-freebsd
  python/cpython#159603 · Filter by author vstinner opened on Oct 17, 2026

• test_lazy_import.test_deeply_dotted_name() does crash on Alpine Linux (SIGSEGV) and FreeBSD (SIGILL)

  teststopic-lazy-importstype-bug
  python/cpython#159535 · Filter by author vstinner opened on Oct 16, 2026
  6

• test_profiling.test_sampling_profiler: test_is_python_process_non_python_subprocess() failed on AMD64 Alpine Linux NoGIL PR

  teststopic-profilingtype-bug
  python/cpython#159534 · Filter by author vstinner opened on Oct 16, 2026
  1

• On macOS with Python 3.15, test_idle and test_tkinter fail with _tkinter.TclError: invalid command name "::tk::unsupported::MacWindowStyle" on Tk/Tcl 9.1

  OS-macteststopic-tkintertype-bug
  python/cpython#159517 · Filter by author vstinner opened on Oct 16, 2026
  3

• 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_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
  

• Run the Python test suite in parallel by default

  teststype-feature
  python/cpython#159155 · Filter by author vstinner opened on Oct 10, 2026
  2

• test_asyncio.test_events failed with "env changed" on AMD64 FreeBSD14 3.14: Warning -- Unraisable exception (...) ResourceWarning: unclosed <socket...>

  OS-freebsdteststopic-asynciotype-bug
  python/cpython#159123 · Filter by author vstinner opened on Oct 10, 2026

• test_concurrent_futures.test_interpreter_pool failed with "Fatal Python error: PyMutex_Unlock: unlocking mutex that is not locked" on RISC-V 64-bit Ubuntu 3.15

  teststopic-subinterpreterstype-bug
  python/cpython#159121 · Filter by author vstinner opened on Oct 10, 2026

• test_wmi.test_wmi_query_threads() crashed with Windows fatal exception: code 0xc0020043 (RPC_NT_INTERNAL_ERROR) on AMD64 Windows PGO Tailcall 3.x

  OS-windowsteststype-bug
  python/cpython#159118 · Filter by author vstinner opened on Oct 10, 2026
  7

• test_profile: ProfileTest.test_cprofile() failed on AMD64 Windows PGO Tailcall 3.x

  OS-windowsteststopic-profilingtype-bug
  python/cpython#159117 · Filter by author vstinner opened on Oct 10, 2026
  1

• Rework Modules/getbuildinfo.c to build strings at build time, instead of runtime

  interpreter-coretype-refactor
  python/cpython#158948 · Filter by author vstinner opened on Oct 7, 2026

• test_multiprocessing_spawn leaked a temporary file (tmpx_v21ney) on FreeBSD 16

  OS-freebsdteststopic-multiprocessing
  python/cpython#158933 · Filter by author vstinner opened on Oct 6, 2026
  4

• test_codecs: LocaleCodecTest fails with some locales on FreeBSD if UTF-8 Mode is disabled

  teststopic-unicode
  python/cpython#158890 · Filter by author vstinner opened on Oct 6, 2026

• Unlimited loop on trying to import the module of the filesystem encoding if iconv() is used

  teststopic-unicode
  python/cpython#158889 · Filter by author vstinner opened on Oct 6, 2026
  4

• test_codecs: IconvTest.test_encode_shift_state_flush() does crash on FreeBSD15

  OS-freebsdteststopic-unicode
  python/cpython#158888 · Filter by author vstinner opened on Oct 6, 2026
  1

• [C API] Add all macros to Misc/stable_abi.toml

  docstopic-C-API
  python/cpython#158886 · Filter by author vstinner opened on Oct 5, 2026
  6

• test_asynico.test_sslproto fails randomly on Windows: "Uncaught thread exception: AssertionError"

  OS-windowsteststopic-asynciotype-bug
  python/cpython#158646 · Filter by author vstinner opened on Oct 3, 2026
  3

• C API: Remove deprecated PySlice_GetIndicesEx(), or remove the deprecation

  interpreter-coretopic-C-APItype-feature
  python/cpython#158077 · Filter by author vstinner opened on Sep 24, 2026
  4

• C API: Remove deprecated PyBytesObject.ob_shash member, or remove the deprecation

  interpreter-coretopic-C-APItype-feature
  python/cpython#158074 · Filter by author vstinner opened on Sep 24, 2026
  3

• The Python C API should only define macros with a name starting wit Py

  buildextension-modulesinfrainterpreter-coretopic-C-API
  python/cpython#157695 · Filter by author vstinner opened on Sep 17, 2026
  9

• test_class.test_detach_materialized_dict_no_memory() fails randomly on the Free Threading macOS CI

  teststopic-free-threadingtype-bug
  python/cpython#157429 · Filter by author vstinner opened on Sep 13, 2026
  2