[SOLVED] Error message during backup: exit code 255

[rada]

Hi everyone! We have been using Proxmox Backup Server during the last month without issues. It's a wonderful complement to Proxmox Virtual Environment.

This week several backups failed and we would like to further troubleshoot the issue.

In one of our PVE installations, the backup process starts and several VMs and CTs are properly backuped. However, we receive this error on one of them:

702: 2021-02-12 02:01:42 INFO: Starting Backup of VM 702 (lxc)
702: 2021-02-12 02:01:42 INFO: status = running
702: 2021-02-12 02:01:42 INFO: CT Name: [CT name removed]
702: 2021-02-12 02:01:42 INFO: including mount point rootfs ('/') in backup
702: 2021-02-12 02:01:42 INFO: backup mode: snapshot
702: 2021-02-12 02:01:42 INFO: ionice priority: 7
702: 2021-02-12 02:01:42 INFO: create storage snapshot 'vzdump'
702: 2021-02-12 02:01:47 INFO: creating Proxmox Backup Server archive 'ct/702/2021-02-12T05:01:42Z'
702: 2021-02-12 02:01:47 INFO: run: lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- /usr/bin/proxmox-backup-client backup --crypt-mode=none pct.conf:/var/tmp/vzdumptmp22809_702/etc/vzdump/pct.conf root.pxar:/mnt/vzsnap0 --include-dev /mnt/vzsnap0/./ --skip-lost-and-found --exclude=/tmp/?* --exclude=/var/tmp/?* --exclude=/var/run/?*.pid --backup-type ct --backup-id 702 --backup-time 1613106102 --repository [removed]
702: 2021-02-12 02:01:47 INFO: Starting backup: ct/702/2021-02-12T05:01:42Z
702: 2021-02-12 02:01:47 INFO: Client name: [removed]
702: 2021-02-12 02:01:47 INFO: Starting backup protocol: Fri Feb 12 02:01:47 2021
702: 2021-02-12 02:01:47 INFO: Downloading previous manifest (Wed Feb 10 02:02:12 2021)
702: 2021-02-12 02:01:47 INFO: Upload config file '/var/tmp/vzdumptmp22809_702/etc/vzdump/pct.conf' to '[removed]' as pct.conf.blob
702: 2021-02-12 02:01:47 INFO: Upload directory '/mnt/vzsnap0' to '[removed]' as root.pxar.didx
702: 2021-02-12 02:12:26 INFO: HTTP/2.0 connection failed
702: 2021-02-12 02:12:28 INFO: Error: broken pipe
702: 2021-02-12 02:12:28 INFO: cleanup temporary 'vzdump' snapshot
702: 2021-02-12 02:12:29 ERROR: Backup of VM 702 failed - command 'lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- /usr/bin/proxmox-backup-client backup '--crypt-mode=none' pct.conf:/var/tmp/vzdumptmp22809_702/etc/vzdump/pct.conf root.pxar:/mnt/vzsnap0 --include-dev /mnt/vzsnap0/./ --skip-lost-and-found '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' --back

up-type ct --backup-id 702 --backup-time 1613106102 --repository [removed]' failed: exit code 255[/CODE]

It seems like Proxmox Backup Server does not notice about the issue, it is only reported in Proxmox Virtual Environment.

Would you give us further assistance to troubleshoot this issue?

Thank you so much for your kind support and assistance!

 

[dcsapak]

702: 2021-02-12 02:12:26 INFO: HTTP/2.0 connection failed

like in your other thread, it seems that the http2 connection is closed somewhere, so it seems to be the same underlying issue

 

[rada]

Dear @dcsapak, thank you so much for pointing us in the right direction. Although we checked the backup logs, when we checked the syslog we noticed a lot of kernel panic messages.

We had to get physical access to the server and we noticed the PSU was failing. After solving the issue, we could start again the backup job and ended OK.

Thank you so much for your patience and support.