On a regular basis, there is "Task Update system failed to execute" error in 
the engine.log. At the same time, the ovirt-host-mgmt-ansible-check log 
contains "Running QEMU processes found, cannot upgrade Vdsm" error.

Is there some configuration setting that controls it? Why oVirt is trying to 
update ovirt-host package on the host at all if there are virtual machines 
running?

Note that 

2019-12-27 11:57:21,880-06 INFO  
[org.ovirt.engine.core.bll.utils.ThreadPoolMonitoringService] 
(EE-ManagedScheduledExecutorService-engineThreadMonitoringThreadPool-Thread-1) 
[] Thread pool 'hostUpdatesChecker' is using 0 threads out of 5, 3 threads 
waiting for tasks.
2019-12-27 12:02:30,878-06 INFO  
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(EE-ManagedExecutorService-hostUpdatesChecker-Thread-4) [] EVENT_ID: 
ANSIBLE_RUNNER_EVENT_NOTIFICATION(559), Check for update of host harrier. 
Gathering Facts.
2019-12-27 12:02:45,990-06 INFO  
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(EE-ManagedExecutorService-hostUpdatesChecker-Thread-4) [] EVENT_ID: 
ANSIBLE_RUNNER_EVENT_NOTIFICATION(559), Check for update of host harrier. 
Install ovirt-host package if it isn't installed.
2019-12-27 12:02:55,024-06 ERROR 
[org.ovirt.engine.core.bll.host.HostUpgradeManager] 
(EE-ManagedExecutorService-hostUpdatesChecker-Thread-4) [] Failed to read host 
packages: Task Update system failed to execute:
2019-12-27 12:02:55,025-06 ERROR 
[org.ovirt.engine.core.bll.hostdeploy.HostUpdatesChecker] 
(EE-ManagedExecutorService-hostUpdatesChecker-Thread-4) [] Failed to check if 
updates are available for host 'harrier' with error message 'Task Update system 
failed to execute: '
2019-12-27 12:02:55,106-06 ERROR 
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(EE-ManagedExecutorService-hostUpdatesChecker-Thread-4) [] EVENT_ID: 
HOST_AVAILABLE_UPDATES_FAILED(839), Failed to check for available updates on 
host harrier with message 'Task Update system failed to execute: '.
2

# rpm -q ovirt-host
ovirt-host-4.4.0-0.2.alpha.el8.x86_64

# dnf update 
Updating Subscription Management repositories.
Last metadata expiration check: 0:11:31 ago on Fri Dec 27 13:16:55 2019.
Error: Running QEMU processes found, cannot upgrade Vdsm.

# dnf update ovirt-host
Updating Subscription Management repositories.
Extra Packages for Enterprise Linux 8 - x86_64                                  
                                     7.3 kB/s | 5.3 kB     00:00    
GlusterFS 6 packages for x86_64                                                 
                                     2.8 kB/s | 3.0 kB     00:01    
GlusterFS 6 noarch packages                                                     
                                      18 kB/s | 3.0 kB     00:00    
virtio-win builds roughly matching what will be shipped in upcoming RHEL        
                                     8.2 kB/s | 3.0 kB     00:00    
Copr repo for EL8_collection owned by sbonazzo                                  
                                      10 kB/s | 3.6 kB     00:00    
Copr repo for gluster-ansible owned by sac                                      
                                      13 kB/s | 3.3 kB     00:00    
Copr repo for ovsdbapp owned by mdbarroso                                       
                                      14 kB/s | 3.3 kB     00:00    
Copr repo for nmstate-stable owned by nmstate                                   
                                      14 kB/s | 3.3 kB     00:00    
Copr repo for NetworkManager-1.20 owned by networkmanager                       
                                      14 kB/s | 3.3 kB     00:00    
Latest oVirt master nightly snapshot                                            
                                     4.0 kB/s | 3.0 kB     00:00    
Latest oVirt master additional nightly snapshot                                 
                                     5.0 kB/s | 3.0 kB     00:00    
Red Hat CodeReady Linux Builder for RHEL 8 x86_64 (RPMs)                        
                                      14 kB/s | 4.5 kB     00:00    
Red Hat Enterprise Linux 8 for x86_64 - BaseOS (RPMs)                           
                                      27 kB/s | 4.1 kB     00:00    
Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)                        
                                      36 kB/s | 4.5 kB     00:00    
Dependencies resolved.
Nothing to do.
Complete!

------------------------- ovirt-host-mgmt-ansible-check log 
--------------------------------------------

2019-12-27 12:02:45 CST - TASK [ovirt-host-upgrade : Update system] 
**************************************
2019-12-27 12:02:55 CST - fatal: [harrier....]: FAILED! => {"changed": false, 
"failures": [], "msg": "Unknown Error occured: Running QEMU processes found, 
cannot upgrade Vdsm.", "rc": 1, "results": []}
2019-12-27 12:02:55 CST - {
  "status" : "OK",
  "msg" : "",
  "data" : {
    "event" : "runner_on_failed",
    "uuid" : "74b495fa-2534-4850-b905-7255fed1fc56",
    "stdout" : "fatal: [harrier...]: FAILED! => {\"changed\": false, 
\"failures\": [], \"msg\": \"Unknown Error occured: Running QEMU processes 
found, cannot upgrade Vdsm.\", \"rc\": 1, \"results\": []}",
    "counter" : 26,
    "pid" : 27445,
    "created" : "2019-12-27T18:02:53.245099",
    "end_line" : 25,
    "runner_ident" : "094f2f72-28d3-11ea-bc88-525400060930",
    "start_line" : 24,
    "event_data" : {
      "play_pattern" : "all",
      "play" : "all",
      "event_loop" : null,
      "task_args" : "",
      "remote_addr" : "harrier....",
      "res" : {
        "_ansible_no_log" : false,
        "changed" : false,
        "results" : [ ],
        "msg" : "Unknown Error occured: Running QEMU processes found, cannot 
upgrade Vdsm.",
        "rc" : 1,
        "invocation" : {
          "module_args" : {
            "lock_timeout" : 300,
            "update_cache" : true,
            "conf_file" : null,
            "exclude" : [ ],
            "allow_downgrade" : false,
            "disable_gpg_check" : false,
            "disable_excludes" : null,
            "validate_certs" : true,
            "state" : "latest",
            "disablerepo" : [ ],
            "releasever" : null,
            "skip_broken" : false,
            "autoremove" : false,
            "download_dir" : null,
            "installroot" : "/",
            "install_weak_deps" : true,
            "name" : [ "*" ],
            "download_only" : false,
            "bugfix" : false,
            "list" : null,
            "install_repoquery" : true,
            "update_only" : false,
            "disable_plugin" : [ ],
            "enablerepo" : [ ],
            "security" : false,
            "enable_plugin" : [ ]
          }
        },
        "failures" : [ ]
      },
      "pid" : 27445,
      "play_uuid" : "52540006-0930-56fb-1424-000000000006",
      "task_uuid" : "52540006-0930-56fb-1424-000000000012",
      "task" : "Update system",
      "playbook_uuid" : "758d0326-a52a-4fe9-87b3-6be0d3492784",
      "playbook" : "ovirt-host-upgrade.yml",
      "task_action" : "yum",
      "host" : "harrier....",
      "ignore_errors" : null,
      "role" : "ovirt-host-upgrade",
      "task_path" : 
"/usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-host-upgrade/tasks/main.yml:18"
    },
    "parent_uuid" : "52540006-0930-56fb-1424-000000000012"
  }
}
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