ImportError: sys.meta_path is None, Python is likely shutting down

I am getting the following error on Python 3.10,
```
Exception ignored in:
Traceback (most recent call last):
File "/home/XXXX/.cache/pypoetry/virtualenvs/modelator-py-5E8ZuFvv-py3.10/lib/python3.10/site-packages/multiprocess/pool.py", line 268, in __del__
File "/home/XXXX/.cache/pypoetry/virtualenvs/modelator-py-5E8ZuFvv-py3.10/lib/python3.10/site-packages/multiprocess/queues.py", line 375, in put
File "/home/XXXX/.cache/pypoetry/virtualenvs/modelator-py-5E8ZuFvv-py3.10/lib/python3.10/site-packages/multiprocess/reduction.py", line 54, in dumps
File "/home/XXXX/.cache/pypoetry/virtualenvs/modelator-py-5E8ZuFvv-py3.10/lib/python3.10/site-packages/multiprocess/reduction.py", line 42, in __init__
File "/home/XXXX/.cache/pypoetry/virtualenvs/modelator-py-5E8ZuFvv-py3.10/lib/python3.10/site-packages/dill/_dill.py", line 573, in __init__
ImportError: sys.meta_path is None, Python is likely shutting down
```

the problem goes away when I switch from `pathos.multiprocessing` to in-built `multiprocessing` library.

@danwt is there any specific reason you were using `pathos`?

Begin with the reported Python 3.10 traceback and compare the pathos.multiprocessing usage with Python's built-in multiprocessing. The issue names no repository file or test entry point, so first locate that usage and reproduce the shutdown behavior; done requires an agreed repository-level resolution and verification.

Written by the indexing model from the issue text.