VMs lock up after backup

[Compizfox]

On my Proxmox server I have a backup job set that backups my VMs and containers to another server over a sshfs mount.

Usually this works fine, but every now and then the backup fails and the VM or container gets powered down and locked up.

The backup fails with "Error: unexpected status". The output is the following:

INFO: starting new backup job: vzdump 100 101 --quiet 1 --mode snapshot --storage alembackup --compress gzip --mailto REDACTED --mailnotification failure
INFO: filesystem type on dumpdir is 'zfs' -using /var/tmp/vzdumptmp29126 for temporary files
INFO: Starting Backup of VM 100 (lxc)
INFO: status = running
INFO: CT Name: benzeen
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: create storage snapshot 'vzdump'
INFO: creating archive '/mnt/alembackup//dump/vzdump-lxc-100-2017_04_15-00_00_02.tar.gz'

I don't see anything in the logs that might explain why the backup failed.

The fact that the backup fails is not the main problem. The main problem is that the VM is down and cannot be powered up. It outputs "TASK ERROR: CT is locked (backup)" when you try to do so, and I have to fire up SSH to the hypervisor and unlock the VM manually to get the VM running again.

Obviously this is a serious problem. VMs shouldn't get shut down because a backup fails, and it is very annoying that this happens periodically.

 

[jadelaop]

Hi, exactly same problem in proxmox 5.1-43:
4.13.13-5-pve #1 SMP PVE 4.13.13-36 (Mon, 15 Jan 2018 12:36:49 +0100) x86_64 GNU/Linux

Randomly, some days at backup in stopped VM, system lock (All VMs and host). No information in log files. My backup mount point is on sshfs. No problem with Proxmox 4.1 (4.2.6-1-pve).

Some solution for Proxmox 5?

Thank you very much.