centos 7 guest with QEMU agent freezing

[bat-zh]

I enabled the guest agent recently on a centos guest and now it's freezing everyday - seems to freeze during the backup PBS. We have to reset the server everyday.

We summitted a ticket to cPanel and a tech there alerted us to this:

https://gitlab.com/qemu-project/qemu/-/issues/520

I guess for now we will disable the guest agent until this is resolved!

we are using:
Virtual Environment 7.2-7

 

[LnxBil]

Hmm ... I run a similar setups yet have not encountered any problem.

Can you describe your system and since when this problem occurs?

 

[bat-zh]

root@proxmox3:~# qm config 169
agent: 1
bios: ovmf
boot: order=scsi0;ide2;net0
cores: 4
efidisk0: NVMe:vm-169-disk-0,efitype=4m,pre-enrolled-keys=1,size=528K
ide2: none,media=cdrom
memory: 8096
meta: creation-qemu=6.1.0,ctime=1649423345
name: GV-WHM
net0: virtio=52:65:E2:84:94:EF,bridge=vmbr0,tag=109
numa: 0
ostype: l26
parent: removeGuestAgent
scsi0: NVMe:vm-169-disk-1,size=580G
scsihw: virtio-scsi-pci
smbios1: uuid=2562f677-6809-4e62-af56-1011ce30e2dd
sockets: 1
vmgenid: 949f3a42-867e-4421-a540-e99d20371d84

Virtual Environment 7.2-7
Backup Server 2.2-7

It started ever since I enabled the guest agent on this VM
This is what cPanel said:

Hello,

Thank you for your update. I was able to successfully access the server. I noticed there is a gap in the server logs between roughly 4AM and 10AM server time. I also noticed the following entries in /var/log/messages that appear to be happening directly before each crash:

[11:15:47 server01 root@94536889 ~]cPs# grep fsfreeze /var/log/messagesstyle='font-family:Consolas;color:#2B2E2F;background:#F8F8F8'>

Feb 26 08:47:01 server01 qemu-ga: info: guest-fsfreeze called

Feb 26 08:47:01 server01 qemu-ga: info: executing fsfreeze hook with arg 'freeze'

Mar 1 08:33:07 server01 qemu-ga: info: guest-fsfreeze called

Mar 1 08:33:07 server01 qemu-ga: info: executing fsfreeze hook with arg 'freeze'

Mar 2 06:42:29 server01 qemu-ga: info: guest-fsfreeze called

Mar 2 06:42:29 server01 qemu-ga: info: executing fsfreeze hook with arg 'freeze'style='color:#2B2E2F'>

Although this doesn't appear to be related to or caused by cPanel, it appears that another user has opened a bug report regarding a similar issue:

https://gitlab.com/qemu-project/qemu/-/issues/520

In short, it appears that the qemu agent could be causing the kernel to crash when it executes 'fsfreeze'. I would recommend working with your system administrator to temporarily disable this package/function to see if it resolves the issue. Since this package is not managed or developed by cPanel, we would be unable to disable it from our side.

 

[LnxBil]

Yes, according to the bug report, there are only a few software products in a special setup affected. So you canot pin-point it to a special PVE version.