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`./python -m test test_interpreters test_struct` fails with: KeyError: concurrent.interpreters._queues.UNBOUND · Issue #142414 · python/cpython · GitHub

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./python -m test test_interpreters test_struct fails with: KeyError: concurrent.interpreters._queues.UNBOUND #142414

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./python -m test test_interpreters test_struct fails with: KeyError: concurrent.interpreters._queues.UNBOUND#142414
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testsTests in the Lib/test dirtopic-subinterpreterstype-bugAn unexpected behavior, bug, or error

Description

ppigazzini
opened on Dec 8, 2025

Bug report

Bug description:

I routinely use on my Ubuntu machines pyenv and a script to install python versions:

Click to view 
 python_ver=3.14.2

# setup pyenv and install latest python
# https://github.com/pyenv/pyenv
# https://github.com/python/pyperformance

if ! command -v pyenv &>/dev/null; then
  # dependencies according to pyenv
  #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

  # Workaround missing libmpdec-dev on ubuntu 24.04 (it should be re introduced in ubuntu 26.04):
  # https://launchpad.net/~ondrej/+archive/ubuntu/php
  # https://deb.sury.org/
  sudo add-apt-repository -y ppa:ondrej/php

  # dependencies according to python build doc dropping packages used in CI (ccache, cmake, gdb, inetutils-inetd, lcov, lzma, strace, xvfb)
  # https://devguide.python.org/getting-started/setup-building/index.html#build-dependencies
  # https://github.com/python/cpython/blob/main/.github/workflows/posix-deps-apt.sh
  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

  pyenv_dir="$HOME/.pyenv"
  git clone https://github.com/pyenv/pyenv.git "$pyenv_dir"

  cat << 'EOF' >> "$HOME/.profile"

# pyenv: keep at the end of the file
export PYENV_ROOT="$HOME/.pyenv"
command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"
EOF

  cat << 'EOF' >> "$HOME/.bashrc"

# pyenv: keep at the end of the file
export PYENV_ROOT="$HOME/.pyenv"
command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"
EOF

  . "$HOME/.profile"
  pushd "$pyenv_dir" && src/configure && make -C src && popd
  #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 "$python_ver"
  CC="clang" CXX="clang++" LDFLAGS="${LDFLAGS:+$LDFLAGS }-fuse-ld=lld" PYTHON_CONFIGURE_OPTS="--enable-optimizations --with-lto" PYTHON_CFLAGS="-march=native -mtune=native" pyenv install "$python_ver"
  #PYTHON_CONFIGURE_OPTS="--enable-optimizations --with-lto" PYTHON_CFLAGS="-march=native -mtune=native" pyenv install "$python_ver"
  pyenv global "$python_ver"
fi

test_struct fails in python3 -m test with python 3.14.2 (and 3.14.1) with this traceback:

Click to view 
0:18:03 load avg: 0.84 [387/491] test_struct
Exception in initializer:
Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 88, in serialize_unbound
    flag = _UNBOUND_CONSTANT_TO_FLAG[op]
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
KeyError: concurrent.interpreters._queues.UNBOUND

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py", line 99, in _worker
    ctx.initialize()
    ~~~~~~~~~~~~~~^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py", line 64, in initialize
    self.results = interpreters.create_queue(maxsize)
                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 75, in create
    unbound = _serialize_unbound(unbounditems)
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 56, in _serialize_unbound
    return _crossinterp.serialize_unbound(unbound)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 90, in serialize_unbound
    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')
NotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND
Exception in initializer:
Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 88, in serialize_unbound
    flag = _UNBOUND_CONSTANT_TO_FLAG[op]
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
KeyError: concurrent.interpreters._queues.UNBOUND

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py", line 99, in _worker
    ctx.initialize()
    ~~~~~~~~~~~~~~^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py", line 64, in initialize
    self.results = interpreters.create_queue(maxsize)
                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 75, in create
    unbound = _serialize_unbound(unbounditems)
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 56, in _serialize_unbound
    return _crossinterp.serialize_unbound(unbound)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 90, in serialize_unbound
    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')
NotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND
Exception in initializer:
Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 88, in serialize_unbound
    flag = _UNBOUND_CONSTANT_TO_FLAG[op]
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
KeyError: concurrent.interpreters._queues.UNBOUND

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py", line 99, in _worker
    ctx.initialize()
    ~~~~~~~~~~~~~~^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py", line 64, in initialize
    self.results = interpreters.create_queue(maxsize)
                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 75, in create
    unbound = _serialize_unbound(unbounditems)
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 56, in _serialize_unbound
    return _crossinterp.serialize_unbound(unbound)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 90, in serialize_unbound
    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')
NotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND
Exception in initializer:
Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 88, in serialize_unbound
    flag = _UNBOUND_CONSTANT_TO_FLAG[op]
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
KeyError: concurrent.interpreters._queues.UNBOUND

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py", line 99, in _worker
    ctx.initialize()
    ~~~~~~~~~~~~~~^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py", line 64, in initialize
    self.results = interpreters.create_queue(maxsize)
                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 75, in create
    unbound = _serialize_unbound(unbounditems)
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 56, in _serialize_unbound
    return _crossinterp.serialize_unbound(unbound)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 90, in serialize_unbound
    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')
NotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND
Exception in initializer:
Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 88, in serialize_unbound
    flag = _UNBOUND_CONSTANT_TO_FLAG[op]
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
KeyError: concurrent.interpreters._queues.UNBOUND

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/thread.py", line 99, in _worker
    ctx.initialize()
    ~~~~~~~~~~~~~~^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/interpreter.py", line 64, in initialize
    self.results = interpreters.create_queue(maxsize)
                   ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 75, in create
    unbound = _serialize_unbound(unbounditems)
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_queues.py", line 56, in _serialize_unbound
    return _crossinterp.serialize_unbound(unbound)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/interpreters/_crossinterp.py", line 90, in serialize_unbound
    raise NotImplementedError(f'unsupported unbound replacement op {op!r}')
NotImplementedError: unsupported unbound replacement op concurrent.interpreters._queues.UNBOUND
test test_struct failed -- Traceback (most recent call last):
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/test/test_struct.py", line 818, in test_endian_table_init_subinterpreters
    self.assertListEqual(list(results), [None] * 5)
                         ~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py", line 639, in result_iterator
    yield _result_or_cancel(fs.pop())
          ~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py", line 311, in _result_or_cancel
    return fut.result(timeout)
           ~~~~~~~~~~^^^^^^^^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py", line 450, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^
  File "/home/usr00/.pyenv/versions/3.14.2/lib/python3.14/concurrent/futures/_base.py", line 395, in __get_result
    raise self._exception
concurrent.futures.interpreter.BrokenInterpreterPool: A thread initializer failed, the thread pool is not usable anymore

0:18:04 load avg: 0.84 [387/491/1] test_struct failed (1 error)

Tested on Ubuntu 24.04 (gcc 14.2.0 - clang 21.1.8) and Ubuntu 20.04 (gcc 11.4.0), several CPUs.

python 3.14.0 and 3.13.x, bult in the same way, pass smoothly python3 -m test

CPython versions tested on:

3.14

Operating systems tested on:

Linux

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