You could also go database diving.  I had an issue where I tried to import a VM from my export domain and it just got hung.  I tried running the unlock_entity script but it just kept failing.  It sat there for months stuck, and found 
http://lists.ovirt.org/pipermail/users/2015-April/032346.html

Of course deleting something from your database is quite permanent. I would wait and upgrade to 4.1.7, but something like the below should work. But probably not recommended

Drop into postgres
psql -d engine -U postgres

List your tasks and grab the job_id
select * from job order by start_time desc;

select DeleteJob('8424f7a9-2a4c-4567-b528-45bbc1c2534f');
Where the string here is the job ID

On Fri, Nov 10, 2017 at 9:48 AM, <nicolas@devels.es> wrote:
El 2017-11-10 14:41, Gianluca Cecchi escribió:
On Fri, Nov 10, 2017 at 3:34 PM, <nicolas@devels.es> wrote:

oVirt upgrade to 4.1.7 will probably cleanup this stale task.
However, if you want to do it before upgrading, run this command:

   PGPASSWORD=...
/usr/share/ovirt-engine/setup/dbutils/unlock_entity.sh -t all -u
engine

Note that unlock_entity.sh has many flags and this is just an
example (should clean all stale tasks).

You can find the PGPASSWORD value in the
/etc/ovirt-engine/engine.conf.d/10-setup-database.conf file. As of
4.2 you won't need to supply credentials anymore [1].

Regards,

Nicolás

It seems it didn't work as expected.
I got this at command line output

"

select fn_db_unlock_all();
 

INSERT 0 1
unlock all  completed successfully.
"


 This is expected.

But the task remains in webadmin gui and I got an alert message in
alert section, of this type
"
/usr/share/ovirt-engine/setup/dbutils/unlock_entity.sh : System user
root run manually unlock_entity script on entity [type,id] [all,] with
db user engine
"


 I've seen this behavior too. IIRC the stale cleaning was not instant, it took some time to be applied.

Regards.

Gianluca
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