[PVE-User] vzdump backups are randomlingly failing

[Laurent CARON]

Hi,

I'm having trouble (randomly) while backing up VMs with the following error:

616: Oct 24 01:29:49 INFO: Starting Backup of VM 616 (qemu)
616: Oct 24 01:29:49 INFO: status = running
616: Oct 24 01:29:50 INFO: backup mode: suspend
616: Oct 24 01:29:50 INFO: ionice priority: 7
616: Oct 24 01:29:51 INFO: suspend vm
616: Oct 24 01:29:52 INFO: trying to aquire lock... failed
616: Oct 24 01:29:52 INFO: can't lock file '/var/log/pve/tasks/.active.lock' - can't aquire lock - Interrupted system call
616: Oct 24 01:29:52 ERROR: Backup of VM 616 failed - command 'qm suspend 616 --skiplock' failed: exit code 4

Most of the time, the backups finish smoothly, sometimes the backup
fails and the VM is hung.

Do you guys have a clue about it ?