Snapshot creation issue

[hspindel]

I occasionally have an issue with creating a snapshot. Most recently, this was the error:

snapshot create failed: starting cleanup
zfs error: cannot destroy 'vm-storage/vm-150-state-Update4': dataset is busy
TASK ERROR: unable to save VM state and RAM - qemu_savevm_state_complete_precopy error -5

All subsequent attempts at creating the snapshot error out with "qmp command 'savevm-start' failed - VM snapshot already started".

I can fix this issue by rebooting proxmox. But is there a cleaner/easier way to recover? I don't see a cancel snapshot option in the GUI. Is there a command line to do this?

Note that the stuck snapshot does not appear in the GUI, so I can't delete it. grep "vm-vmnum" /proc/*/mounts returns nothing.

Snapshots of other VMs still work okay.

vn unlock vmid doesn't help.

 

[viktorio]

If, despite trying to restart your VM, the qemu process is still stuck, identify the process:

ps aux | grep qemu-kvm | grep -w 150

Terminate it:

kill xxxxx

If it is still stuck, force termination:

kill -9 xxxxx

Check for the dataset:

zfs list | grep vm-150-state-Update4

Delete the problematic dataset:

zfs destroy vm-storage/vm-150-state-Update4

Check the configuration file /etc/pve/local/qemu-server/150.conf:

nano /etc/pve/local/qemu-server/150.conf

Delete the last block […]
Try running the snapshot again.

 

[hspindel]

Thank you. I will try that.

I did discover that shutting down the VM allowed the snapshot to be created.