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At the point it occurs, the system becomes unresponsive and I cannot bring it back to life. Enabling /proc/sys/kernel/softlockup_all_cpu_backtrace does not give anything extra in the way of debug. All I get is something like this: Message from syslogd@jgarry-atomic-write-exp-e4-8-instance-20231214-1221 at Oct 24 15:34:02 ... kernel:watchdog: BUG: soft lockup - CPU#29 stuck for 22s! [mysqld:14352] Message from syslogd@jgarry-atomic-write-exp-e4-8-instance-20231214-1221 at Oct 24 15:34:02 ... kernel:BUG: workqueue lockup - pool cpus=4 node=0 flags=0x0 nice=0 stuck for 30s! Message from syslogd@jgarry-atomic-write-exp-e4-8-instance-20231214-1221 at Oct 24 15:34:02 ... kernel:BUG: workqueue lockup - pool cpus=31 node=0 flags=0x0 nice=0 stuck for 49s! ^C Can you advise on a robust method to get some debug from this system? Maybe this is a scheduler issue, as Dave mentioned in that same thread. Thanks, John