I have a VERY simple Ubuntu 16 x64 VM setup on my ESXi host which acts as a fileserver. It has NFS/SMB and MDADM installed. It is fully updated.
Twice in the last week it has hung with an error about
“rcu_sched detected stalls on CPUs and something about not enough jiffies.
I took a screen shot this time, but its so bad that ESXi can't kill the VM and after reboot is causing a rebuild of my MDADM Array. I worry this will cause unnecessary damage to my HDD's and wonder what the problem could be? The VM is given plenty of extra resources w/ 1vCPU and 4vThreads w/ 6GB Ram.
Any ideas? The VM is back running now, so I can debug any information requested. I'm thinking about just moving to a RHEL based Distro, but I'd like to figure out the problem vs rebuilding on a different Linux OS.
PS: I am the main user and as far as I remember there were no intensive R/W operations going on at the time.