parallel execution of PARI/GP functions with `multiprocessing` library results in `ExceptionPexpect`

[maxale]

Steps To Reproduce

The following code works fine:

@parallel('fork')
def test(n):
    return pari.isprime(n).sage()

list( test([1,2,3]) )

However, if we replace 'fork' with 'multiprocessing', it breaks.

Expected Behavior

It should work.

Actual Behavior

We get

ExceptionPexpect: isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?

Additional Information

No response

Environment

• OS: Ubuntu 24.04.3 LTS
• Sage Version: 10.7.beta8

Checklist

• I have searched the existing issues for a bug report that matches the one I want to file, without success.
• I have read the documentation and troubleshoot guide