Python 3.14 multiprocess issues on linux

[stk0vrfl0w]

After upgrading from python 3.12 to python 3.14 and re-installing green, it appears as though there are intermittent multiprocessing issues after the unit tests have been executed. Testing across multiple linux hosts show the issue occurs roughly 30% of the time with my current src tree.

> uname -a
Linux 9652860e54bf 6.12.54-linuxkit #1 SMP Tue Nov  4 21:21:47 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

> green --version
Green 4.0.2, Coverage 7.13.1, Python 3.14.2

> green --run-coverage src

<snip>

Ran 127 tests in 1.038s using 6 processes

OK (passes=127)
Traceback (most recent call last):
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/multiprocessing/util.py", line 371, in _run_finalizers
    finalizer()
    ~~~~~~~~~^^
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/multiprocessing/util.py", line 295, in __call__
    res = self._callback(*self._args, **self._kwargs)
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/multiprocessing/util.py", line 147, in _remove_temp_dir
    rmtree(tempdir)
    ~~~~~~^^^^^^^^^
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/shutil.py", line 852, in rmtree
    _rmtree_impl(path, dir_fd, onexc)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/shutil.py", line 721, in _rmtree_safe_fd
    _rmtree_safe_fd_step(stack, onexc)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/shutil.py", line 799, in _rmtree_safe_fd_step
    onexc(func, path, err)
    ~~~~~^^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.14.2/lib/python3.14/shutil.py", line 760, in _rmtree_safe_fd_step
    orig_st = os.lstat(name, dir_fd=dirfd)
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmpx2bnwzbf/pymp-m_chjio4'

[CleanCut]

Is your code open source? Can I see it? If not, can you reduce this to an example test that triggers the problem?