Kernel Null Pointer dereference

lightingman117

I am on 8.2.1; uptime 8+ months, no issues.

This is the IPMI screen output (VGA)

xcp-ng server bug console.PNG

Recent history:
I fast copied a Win10 VM yesterday and stood it up for a user.
A tech randomed (wrong IP) into viewing the IPMI output today and pointed it out to me.

I checked:
/var/log/daemon.log
/var/log/xensource.log
/var/log/SMlog
/var/log/kern.log
dmesg

I don't see any references to a Kernel Bug in any of the logs.

Seems similar to this thread: https://xcp-ng.org/forum/topic/5174/kernel-null-pointer

olivierlambert

Check the dmesg. I'm feeling it's a fixed bug with our updates, since your uptime is 8+ month, you must update and reboot your host.

lightingman117

Ahh found it. Musta glanced over it when I skimmed through dmesg the first time.

Thank you!

[14681859.111298] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000

So for the updates. How do I know when I need to install updates? I looked at releases and saw 8.2.1 was latest. Do I need to check somewhere like github?

NVM: https://koji.xcp-ng.org/builds?inherited=0&tagID=42&order=-build_id&latest=1

https://xcp-ng.org/docs/updates.html#prerequisites

FYI, system is 100% offline; so I will now subscribe to the update thread... lol
https://xcp-ng.org/forum/topic/365/updates-announcements-and-testing

Wow. Failure to read documentation. [I tried, kinda]

olivierlambert

A good place to stay tuned about updates is our XCP-ng blog. Also, Xen Orchestra is displaying available updates with a "red pill" which is very visible. Aren't you using Xen Orchestra?

lightingman117

@olivierlambert

I do read the Blogs. They're one of the better/best blogs out there

I guess I don't (didn't) understand LTS vs updates vs upgrades.

System is airgapped so Xen Orchestra has no idea there are updates

My long-running goal is to build an edge server VM to clone repos for updates.

olivierlambert

LTS doesn't mean no updates. You always need to patch for bugs or security issues