@nvs said in XCP-NG server crashes/reboots unexpectedly:
Thanks. Unfortunately my machine doesnt have IPMI. So can I just connect a serial cable between this machine and another machine
Yes though you would still need to boot using the "XCP-ng (Serial)" grub entry.
(you can also add some serial console bits adding them to xen cmdline)
@nvs said in XCP-NG server crashes/reboots unexpectedly:
@nvs Machine crashed/restarted itself again this morning. I didn't even have all of the usual VMs running this time. Nothing was logged in kern.log when it crashed again. Before it crashed I checked a few times in the hours before xl dmesg but nothing obvious to me (same log as I posted above). Any suggestions highly welcome as I'm sure how to proceed with troubleshooting this. My next step would be replacing the PSU and see if anything changes, but its a long shot.
Ok so it doesn't seem caused by a driver bug causing corruption somewhere in Xen/Linux.
So something is causing Xen to crash, and it's not very easy to know without using e.g the serial console (so you can get the actual Xen crash message).
You need for that something connected and monitoring the machine's serial console (or using IPMI) and boot XCP-ng in "(serial)" mode.
@nvs you need to reboot, and it should stick accros reboots
Side question, any chance to tail -f xl dmesg to see real time output? That would allow me to see any last messages before it crashes potentially.
xl dmesg -c allow you to clear the Xen console while displaying it
Can you try adding iommu=strict to Xen command-line ?
/opt/xensource/libexec/xen-cmdline --set-xen "dom0-iommu=strict"
And regularly check if there is something showing up in xl dmesg.
@AlbertK Thanks. There's no nested-virt configured there.
I have to admit this is looking more and more like buggy CPU. Memory corruption is a possibility, but this is a clearly corrupt field in the middle of otherwise sane-looking fields in the VMCB.
Do you have any other identical systems? Can you swap this CPU out for another one to see what happens?
@JeffBerntsen said in Status of PVH:
@TeddyAstie Do you know if these can be set in XO or are they only via command line at this point? I'm curious and also curious as to how well supported because I'm looking at a possible migration from XS 7.1.2 to XCP-ng 8.3 where there are several 32-bit PV machines.
It can be only be set from command-line for now. Though Xen Orchestra should be updated to convert to PV-in-PVH instead of between HVM and PV (this one being unsupported and not bootable anymore).
@sborrill ouch that not practical
The command you provide doesn't work for pv-in-pvh.
A equivalent for the PV-shim would be
xe vm-param-add uuid={UUID} param-name=platform pvinpvh-xen-cmdline="pv-shim console=xen pv-linear-pt=true"
@AlbertK None of those commands are relevant in a Xen system. You want xe vm-param-list uuid=$VM
@AlbertK That looks suspiciously like you've enabled nested virt in the VM. Can you confirm whether you have or not?
We don't have a usable support for PVH guest at this time, though, for booting a PV guest on XCP-ng 8.3, you can enable PV-shim, e.g
xe vm-param-set uuid={UUID} domain-type=pv-in-pvh
