Can repro by running em_style for N = 70000, seeds = 42 + range(10)
It looks like some processes (like nss cache) spring up when there's a deadlock?
Need to fix later
This may also be related to OOMs:
slurmstepd: error: Detected 272 oom-kill event(s) in step 1515204.batch cgroup. Some of your processes may have been killed by the cgroup out-of-memory handler.