René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`./python -m test test_interpreters test_struct` fails with: KeyError: concurrent.interpreters._queues.UNBOUND","articleBody":"# Bug report\n\n### Bug description:\n\nI routinely use on my Ubuntu machines `pyenv` and a script to install python versions:\n\u003cdetails\u003e\u003csummary\u003eClick to view\u003c/summary\u003e\n\n```bash\n python_ver=3.14.2\n\n# setup pyenv and install latest python\n# https://github.com/pyenv/pyenv\n# https://github.com/python/pyperformance\n\nif ! command -v pyenv \u0026\u003e/dev/null; then\n  # dependencies according to pyenv\n  #sudo apt update; sudo apt install -y build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev\n\n  # Workaround missing libmpdec-dev on ubuntu 24.04 (it should be re introduced in ubuntu 26.04):\n  # https://launchpad.net/~ondrej/+archive/ubuntu/php\n  # https://deb.sury.org/\n  sudo add-apt-repository -y ppa:ondrej/php\n\n  # dependencies according to python build doc dropping packages used in CI (ccache, cmake, gdb, inetutils-inetd, lcov, lzma, strace, xvfb)\n  # https://devguide.python.org/getting-started/setup-building/index.html#build-dependencies\n  # https://github.com/python/cpython/blob/main/.github/workflows/posix-deps-apt.sh\n  sudo apt update; sudo apt install -y build-essential pkg-config libb2-dev libbz2-dev libffi-dev libgdbm-dev libgdbm-compat-dev liblzma-dev libncurses5-dev libreadline6-dev libsqlite3-dev libssl-dev lzma-dev tk-dev uuid-dev zlib1g-dev libzstd-dev libmpdec-dev\n\n  pyenv_dir=\"$HOME/.pyenv\"\n  git clone https://github.com/pyenv/pyenv.git \"$pyenv_dir\"\n\n  cat \u003c\u003c 'EOF' \u003e\u003e \"$HOME/.profile\"\n\n# pyenv: keep at the end of the file\nexport PYENV_ROOT=\"$HOME/.pyenv\"\ncommand -v pyenv \u003e/dev/null || export PATH=\"$PYENV_ROOT/bin:$PATH\"\neval \"$(pyenv init -)\"\nEOF\n\n  cat \u003c\u003c 'EOF' \u003e\u003e \"$HOME/.bashrc\"\n\n# pyenv: keep at the end of the file\nexport PYENV_ROOT=\"$HOME/.pyenv\"\ncommand -v pyenv \u003e/dev/null || export PATH=\"$PYENV_ROOT/bin:$PATH\"\neval \"$(pyenv init -)\"\nEOF\n\n  . \"$HOME/.profile\"\n  pushd \"$pyenv_dir\" \u0026\u0026 src/configure \u0026\u0026 make -C src \u0026\u0026 popd\n  #CC=\"clang\" CXX=\"clang++\" LDFLAGS=\"${LDFLAGS:+$LDFLAGS }-fuse-ld=lld\" PYTHON_CONFIGURE_OPTS=\"--enable-optimizations --with-lto --with-tail-call-interp --enable-bolt\" PYTHON_CFLAGS=\"-march=native -mtune=native\" pyenv install \"$python_ver\"\n  CC=\"clang\" CXX=\"clang++\" LDFLAGS=\"${LDFLAGS:+$LDFLAGS }-fuse-ld=lld\" PYTHON_CONFIGURE_OPTS=\"--enable-optimizations --with-lto\" PYTHON_CFLAGS=\"-march=native -mtune=native\" pyenv install \"$python_ver\"\n  #PYTHON_CONFIGURE_OPTS=\"--enable-optimizations --with-lto\" PYTHON_CFLAGS=\"-march=native -mtune=native\" pyenv install \"$python_ver\"\n  pyenv global \"$python_ver\"\nfi\n```\n\u003c/details\u003e\n\n`test_struct` fails in `python3 -m test` with python 3.14.2 (and 3.14.1) with this traceback:\n\u003cdetails\u003e\u003csummary\u003eClick to view\u003c/summary\u003e\n\n```\n0:18:03 load avg: 0.84 [387/491] test_struct\nException in initializer:\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 88, in serialize_unbound\n    flag = _UNBOUND_CONSTANT_TO_FLAG[op]\n           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^\nKeyError: concurrent.interpreters._queues.UNBOUND\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py\", line 99, in _worker\n    ctx.initialize()\n    ~~~~~~~~~~~~~~^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py\", line 64, in initialize\n    self.results = interpreters.create_queue(maxsize)\n                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 75, in create\n    unbound = _serialize_unbound(unbounditems)\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 56, in _serialize_unbound\n    return _crossinterp.serialize_unbound(unbound)\n           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 90, in serialize_unbound\n    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')\nNotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND\nException in initializer:\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 88, in serialize_unbound\n    flag = _UNBOUND_CONSTANT_TO_FLAG[op]\n           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^\nKeyError: concurrent.interpreters._queues.UNBOUND\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py\", line 99, in _worker\n    ctx.initialize()\n    ~~~~~~~~~~~~~~^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py\", line 64, in initialize\n    self.results = interpreters.create_queue(maxsize)\n                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 75, in create\n    unbound = _serialize_unbound(unbounditems)\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 56, in _serialize_unbound\n    return _crossinterp.serialize_unbound(unbound)\n           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 90, in serialize_unbound\n    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')\nNotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND\nException in initializer:\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 88, in serialize_unbound\n    flag = _UNBOUND_CONSTANT_TO_FLAG[op]\n           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^\nKeyError: concurrent.interpreters._queues.UNBOUND\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py\", line 99, in _worker\n    ctx.initialize()\n    ~~~~~~~~~~~~~~^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py\", line 64, in initialize\n    self.results = interpreters.create_queue(maxsize)\n                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 75, in create\n    unbound = _serialize_unbound(unbounditems)\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 56, in _serialize_unbound\n    return _crossinterp.serialize_unbound(unbound)\n           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 90, in serialize_unbound\n    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')\nNotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND\nException in initializer:\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 88, in serialize_unbound\n    flag = _UNBOUND_CONSTANT_TO_FLAG[op]\n           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^\nKeyError: concurrent.interpreters._queues.UNBOUND\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py\", line 99, in _worker\n    ctx.initialize()\n    ~~~~~~~~~~~~~~^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py\", line 64, in initialize\n    self.results = interpreters.create_queue(maxsize)\n                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 75, in create\n    unbound = _serialize_unbound(unbounditems)\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 56, in _serialize_unbound\n    return _crossinterp.serialize_unbound(unbound)\n           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 90, in serialize_unbound\n    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')\nNotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND\nException in initializer:\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 88, in serialize_unbound\n    flag = _UNBOUND_CONSTANT_TO_FLAG[op]\n           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^\nKeyError: concurrent.interpreters._queues.UNBOUND\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py\", line 99, in _worker\n    ctx.initialize()\n    ~~~~~~~~~~~~~~^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py\", line 64, in initialize\n    self.results = interpreters.create_queue(maxsize)\n                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 75, in create\n    unbound = _serialize_unbound(unbounditems)\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py\", line 56, in _serialize_unbound\n    return _crossinterp.serialize_unbound(unbound)\n           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py\", line 90, in serialize_unbound\n    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')\nNotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND\ntest test_struct failed -- Traceback (most recent call last):\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/test/test_struct.py\", line 818, in test_endian_table_init_subinterpreters\n    self.assertListEqual(list(results), [None] * 5)\n                         ~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py\", line 639, in result_iterator\n    yield _result_or_cancel(fs.pop())\n          ~~~~~~~~~~~~~~~~~^^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py\", line 311, in _result_or_cancel\n    return fut.result(timeout)\n           ~~~~~~~~~~^^^^^^^^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py\", line 450, in result\n    return self.__get_result()\n           ~~~~~~~~~~~~~~~~~^^\n  File \"/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py\", line 395, in __get_result\n    raise self._exception\nconcurrent.futures.interpreter.BrokenInterpreterPool: A thread initializer failed, the thread pool is not usable anymore\n\n0:18:04 load avg: 0.84 [387/491/1] test_struct failed (1 error)\n```\n\u003c/details\u003e\n\nTested on Ubuntu 24.04 (gcc 14.2.0 - clang 21.1.8) and Ubuntu 20.04 (gcc 11.4.0), several CPUs.\n\npython 3.14.0 and 3.13.x, bult in the same way, pass smoothly `python3 -m test`\n\n### CPython versions tested on:\n\n3.14\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-142515\n* gh-142553\n* gh-142577\n* gh-144096\n* gh-145184\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/ppigazzini","@type":"Person","name":"ppigazzini"},"datePublished":"2025-12-08T12:16:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":24},"url":"https://github.com/142414/cpython/issues/142414"}