Created attachment 1134396 [details]
engine log

Description of problem:
Sometimes the master domain cannot be moved to maintenance mode, with this error
Failed to deactivate storage domain nfs_0 (Data Center golden_env_mixed)

Version-Release number of selected component (if applicable):


How reproducible:
30%

Steps to Reproduce:
1.add master domain wait for everything to be up
2. try to put it into maintenance 
3.

Actual results:
Failed to deactivate storage domain nfs_0 (Data Center golden_env_mixed)

Expected results:
should be able to put it into maintenance

Additional info:
 looking at the logs I saw that there are tasks causing the failure:

SpmStopVDSCommand::Not stopping SPM on vds 'host_mixed_4', pool id '457833c9-adf9-4939-ae00-9dc198c50039' as there are uncleared tasks
.....
DeactivateStorageDomainCommand] (org.ovirt.thread.pool-6-thread-5) [253137b9] Aborting execution due to failure to stop SPM

 when I checked the tasks table I saw a lot of them (123) with:
 status | action_type 
--------+-------------
      2 |        1010
    
vdsm_task_id = 00000000-0000-0000-0000-000000000000 


I have kept an environment in this state and we see it happening in dev ci as well