Deadlock in python 3.8
Can be reproduces with https://gitlab.esrf.fr/denolf/workflow_concepts
while pytest esrf2pypushflow/tests/test_job.py::test_job -s; do echo "ok";done
I'll try to create a standalone example if I have the time.
What happens as far as I can tell is that
pool.apply_async gets called but nothing happens (the subprocess does not start and neither the normal nor error callback is called).