Dear community,

Trying to implement the latest fix/patch for munged, we restarted the updated munged locally on the compute nodes with "systemctl restart munged", resulting in the sudden death of a lot of compute nodes' slurmd.

Checking the jobs on the affected nodes, we saw a lot of user processes/jobs still running, which was good - yet  "systemctl restart slurmd" cancelled all of them, eg.

[2026-02-12T17:08:00.325] Cleaning up stray StepId=49695760.extern
[2026-02-12T17:08:00.325] [49695760.extern] Sent signal 9 to StepId=49695760.extern
[2026-02-12T17:08:00.325] slurmd version 25.05.5 started

and all affected user jobs (even though having survived the death of their parent slurmd) were killed and re-queued...

We have cgroups v2 (only, no hybrid), "Delegate=yes" in the slurmd unit and "ProctrackType=proctrack/cgroup" configured. 

Other sites do not see the same behavior (their user jobs survive a slurmd restart without issues), so now we are at a loss figuring out why the h.... this happens within our setup.

Anyone experienced similar problems and got them solved...?

Thanks in advance -

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___________________________
Christian Griebel/HPC

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