Proxmox hangs after upgrade to v9

[yunmkfed]

Last Saturday I upgraded from Proxmox v8 to v9 based on the instructions downloaded from here. It went smoothly.

Today I noticed that the VM's and containers were down. The console had the following text on it and was not responsive.

The VM had been running smoothly without a hitch for months.

Any help to diagnose / resolve.

 

[Onslow]

In the photo I can see exim4. Proxmox itself uses Postfix, not Exim. Is your system a standalone Proxmox or Proxmox on top of Debian?

 

[yunmkfed]

Stand alone Proxmox

 

[Onslow]

Split locks are discussed e.g. here:

https://pve.proxmox.com/wiki/Split_lock_detection ||| https://forum.proxmox.com/threads/x86-split-lock-detection-log-entries-after-reboot.143863/ ||| https://forum.proxmox.com/threads/split-lock-detected-on-intel-xeon-silver-4310-cpus-under-load-in-proxmox-–-troubleshooting-steps.160931/

though they mention (artificial) slowdowns, not hanging...
I hope someone more experienced will help.

 

[yunmkfed]

Thanks. I'll wait for other inputs before making changes.