Hello,

we are using ovirt 4.2.8.2-1.el7.

One our user probably tried to preview taken snapshot but the task is
stucked and never finished. Also disk is locked.

Here is engine.log

https://pastebin.com/izBJ1BUg

I am not sure what went wrong except one java.lang.NullPointerException
error... Could it be some bug?

Also I would like to unlock disk and clean this task. I can see locked
snapshot and disk

[root@ovirt dbutils]# ./unlock_entity.sh -q -t snapshot -c

Locked snapshots

                vm_id                 |             snapshot_id

--------------------------------------+--------------------------------------
 df27ee13-9961-41d5-a4eb-bbb0aadf9086 | 58998020-08cb-4c84-8847-0cb6790724ba

[root@ovirt dbutils]# ./unlock_entity.sh -q -t disk -c

Locked disks

                vm_id                 |               disk_id

--------------------------------------+--------------------------------------
 df27ee13-9961-41d5-a4eb-bbb0aadf9086 | f6405448-baf8-4cc2-8ee7-798ca11cad10

but no runnig tasks

[root@ovirt dbutils]# ./taskcleaner.sh -o
 t

but in ovirt-manager I see this stucked task...

Preview VM Snapshot predsysprep of VM install_10_64bit_LTSB_UK_ucebny -
Started: Feb 12, 2019, 11:28:04 AM
Validating - Completed: Feb 12, 2019, 11:28:04 AM
Executing - Completed: Feb 12, 2019, 11:28:15 AM
Creating Volume - Completed: Feb 12, 2019, 11:28:15 AM
Finalizing - Started: Feb 12, 2019, 11:28:15 AM

what is best approach to unlock and clean this?

Thanks in advance,

Cheers, Jiri

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