Hi, Ovirt 4.3.9.4-1.el7, CentOS7... colleague of me tried yesterday do a snapshot preview on his vm but operation got stalled. I can see in Task list in Manager operation "Preview VM Snapshot před AD test of VM install_W10_LTSC-REK" in state Finalizing (6 hours ago) In the Events I see May 19, 2020, 4:00:17 PM Failed to complete Snapshot-Preview před AD test for VM install_W10_LTSC-REK. 18acb86e-581c-43f5-bf99-f8d738870976 May 19, 2020, 3:57:40 PM Failed to run VM install_W10_LTSC-REK due to a failed validation: [Cannot run VM. The VM is performing an operation on a Snapshot. Please wait for the operation to finish, and try again.] (User: ******@*********). d892b7dd-741b-4c61-ac37-b1077eaeaf79 When I grepping correlation id from failed run from engine log a got zcat /var/log/ovirt-engine/engine.log-20200520.gz | grep "d892b7dd-741b-4c61-ac37-b1077eaeaf79" 2020-05-19 15:57:40,435+02 INFO [org.ovirt.engine.core.bll.RunVmCommand] (default task-210) [d892b7dd-741b-4c61-ac37-b1077eaeaf79] Lock Acquired to object 'EngineLock:{exclusiveLocks='[2f1fb183-55ea-477c-a75b-625f889e4c79=VM]', sharedLocks=''}' 2020-05-19 15:57:40,489+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-210) [d892b7dd-741b-4c61-ac37-b1077eaeaf79] EVENT_ID: USER_FAILED_RUN_VM(54), Failed to run VM install_W10_LTSC-REK due to a failed validation: [Cannot run VM. The VM is performing an operation on a Snapshot. Please wait for the operation to finish, and try again.] (User: kra0002@CRO.slu.cz). 2020-05-19 15:57:40,489+02 WARN [org.ovirt.engine.core.bll.RunVmCommand] (default task-210) [d892b7dd-741b-4c61-ac37-b1077eaeaf79] Validation of action 'RunVm' failed for user kra0002@CRO.slu.cz. Reasons: VAR__ACTION__RUN,VAR__TYPE__VM,ACTION_TYPE_FAILED_VM_IS_DURING_SNAPSHOT 2020-05-19 15:57:40,489+02 INFO [org.ovirt.engine.core.bll.RunVmCommand] (default task-210) [d892b7dd-741b-4c61-ac37-b1077eaeaf79] Lock freed to object 'EngineLock:{exclusiveLocks='[2f1fb183-55ea-477c-a75b-625f889e4c79=VM]', sharedLocks=''}' greping correlation id on failed snapshot preview shows only INFO events, not ERRORS nor WARNINGS and it looks to me like everything was FINISHed When I try to display locked entities a got cd /usr/share/ovirt-engine/setup/dbutils ./unlock_entity.sh -q -t all -c Locked VMs vm_name | snapshot_id ----------------------+-------------------------------------- install_W10_LTSC-REK | 9d53c7b4-8ec5-4d31-8ab1-16bb75ab8f2b Locked templates template_name | disk_id ---------------+--------- Locked disks vm_id | disk_id --------------------------------------+-------------------------------------- 2f1fb183-55ea-477c-a75b-625f889e4c79 | 707db1f6-0859-48ab-b9d0-a97619ed8b0b Locked snapshots vm_id | snapshot_id --------------------------------------+-------------------------------------- 2f1fb183-55ea-477c-a75b-625f889e4c79 | 9d53c7b4-8ec5-4d31-8ab1-16bb75ab8f2b Illegal images vm_name | image_guid ---------+------------ I am about to try unlock that snapshot but for sure... * how can I be sure that snapshot operations is not still running (it would be nice to have some sort of progress bar o better reporting what is happening in Manager...) * looks it like bug? Should I fill bugreport or publish more logs? Cheers, Jiri