Ubuntu spontaneously booted around 13:30 today. The logs indicated an intentional reboot but I didn’t request one, so don’t know if a signal went to the wrong process (systemd) or exactly what happened.
Then around 6pm the load on inuvik which hosts one of our web servers and debian and manjaro, went through the roof. Upon examination, apache was not reaping processes, upon killing apache to force systemd to reap them, systemd also failed to do so.
At that point I rebooted the machine because something appears to have corrupted the process table and allowing it to continue long would have probably resulted in a total system lockup.