We've been having some mysterious hangs in our threaded code. Debugging with GDB shows it ends up deadlocking during logging inside logging._acquireLock()

I googled and found someone else with the same issue: https://stackoverflow.com/questions/62059975/python-multiprocessing-logging-hangs

I'm able to replicate this on python 3.7.9 on two entirely separate machines (one ubuntu, one arch linux), though I had to bump up the number of iterations to 1000.