Hello, I have the same problem but i use the ovirt version 4.0.4.4-1.el7.centos .

My logs.


Engine.log

2016-09-28 08:18:00,947 INFO  [org.ovirt.engine.core.vdsbroker.monitoring.VmJobsMonitoring] (DefaultQuartzScheduler1) [7013b545] VM Job [4dd2b885-2452-4520-b20a-928edea50836]: In progress (no change)
2016-09-28 08:18:08,010 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand] (default task-54) [5a27e364] Lock Acquired to object 'EngineLock:{exclusiveLocks='[eb73a967-1908-46e9-9de2-9706bf29643a=<VM, ACTION_TYPE_FAILED_OBJECT_LOCKED>]', sharedLocks='null'}'
2016-09-28 08:18:09,169 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand] (default task-54) [5a27e364] Running command: RemoveSnapshotCommand internal: false. Entities affected :  ID: eb73a967-1908-46e9-9de2-9706bf29643a Type: VMAction group MANIPULATE_VM_SNAPSHOTS with role type USER
2016-09-28 08:18:09,185 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand] (default task-54) [5a27e364] Lock freed to object 'EngineLock:{exclusiveLocks='[eb73a967-1908-46e9-9de2-9706bf29643a=<VM, ACTION_TYPE_FAILED_OBJECT_LOCKED>]', sharedLocks='null'}'
2016-09-28 08:18:09,265 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (pool-7-thread-3) [354939e9] Running command: RemoveSnapshotSingleDiskLiveCommand internal: true. Entities affected :  ID: 00000000-0000-0000-0000-000000000000 Type: Storage
2016-09-28 08:18:09,302 INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-54) [] Correlation ID: 5a27e364, Job ID: 661f8f55-30c6-4735-bb0a-fdcd3ac4004a, Call Stack: null, Custom Event ID: -1, Message: Snapshot 'Backup the VM' deletion for VM 'SRV-ActPrint' was initiated by admin@internal.
2016-09-28 08:18:10,197 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler4) [354939e9] Executing Live Merge command step 'EXTEND'
2016-09-28 08:18:10,254 INFO  [org.ovirt.engine.core.bll.MergeExtendCommand] (pool-7-thread-7) [57c94fc3] Running command: MergeExtendCommand internal: true. Entities affected :  ID: 6e5cce71-3438-4045-9d54-607123e0557e Type: Storage
2016-09-28 08:18:10,255 INFO  [org.ovirt.engine.core.bll.MergeExtendCommand] (pool-7-thread-7) [57c94fc3] Refreshing volume c08d86ed-46f1-44bc-9476-0cc2c6aed367 on host f22d87b9-4449-4a71-8529-58095dd81b6f
2016-09-28 08:18:10,275 INFO  [org.ovirt.engine.core.bll.RefreshVolumeCommand] (pool-7-thread-7) [47625ba4] Running command: RefreshVolumeCommand internal: true.
2016-09-28 08:18:10,275 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.RefreshVolumeVDSCommand] (pool-7-thread-7) [47625ba4] START, RefreshVolumeVDSCommand(HostName = Host04, RefreshVolumeVDSCommandParameters:{runAsync='true', hostId='f22d87b9-4449-4a71-8529-58095dd81b6f', storagePoolId='77e24b20-9d21-4952-a089-3c5c592b4e6d', storageDomainId='6e5cce71-3438-4045-9d54-607123e0557e', imageGroupId='9fc0b2f6-d786-4a21-8f5c-b22b23df4aaa', imageId='c08d86ed-46f1-44bc-9476-0cc2c6aed367'}), log id: 77b9ded4
2016-09-28 08:18:11,245 INFO  [org.ovirt.engine.core.bll.ConcurrentChildCommandsExecutionCallback] (DefaultQuartzScheduler8) [354939e9] Command 'RemoveSnapshot' (id: '18613dc9-d8c8-45c4-9fbe-a298e701ead5') waiting on child command id: 'fd866748-3211-4d48-9908-12eb6078a69e' type:'RemoveSnapshotSingleDiskLive' to complete
2016-09-28 08:18:11,810 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.RefreshVolumeVDSCommand] (pool-7-thread-7) [47625ba4] FINISH, RefreshVolumeVDSCommand, log id: 77b9ded4
2016-09-28 08:18:11,810 INFO  [org.ovirt.engine.core.bll.RefreshVolumeCommand] (pool-7-thread-7) [47625ba4] Successfully refreshed volume 'c08d86ed-46f1-44bc-9476-0cc2c6aed367' on host 'f22d87b9-4449-4a71-8529-58095dd81b6f'
2016-09-28 08:18:12,267 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler10) [354939e9] Waiting on Live Merge command step 'EXTEND' to finalize
2016-09-28 08:18:14,294 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler9) [354939e9] Executing Live Merge command step 'MERGE'
2016-09-28 08:18:14,347 INFO  [org.ovirt.engine.core.bll.MergeCommand] (pool-7-thread-2) [15ef379f] Running command: MergeCommand internal: true. Entities affected :  ID: 6e5cce71-3438-4045-9d54-607123e0557e Type: Storage
2016-09-28 08:18:14,348 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [15ef379f] START, MergeVDSCommand(HostName = Host04, MergeVDSCommandParameters:{runAsync='true', hostId='f22d87b9-4449-4a71-8529-58095dd81b6f', vmId='eb73a967-1908-46e9-9de2-9706bf29643a', storagePoolId='77e24b20-9d21-4952-a089-3c5c592b4e6d', storageDomainId='6e5cce71-3438-4045-9d54-607123e0557e', imageGroupId='9fc0b2f6-d786-4a21-8f5c-b22b23df4aaa', imageId='95fefce5-7599-460f-b38c-377323659b52', baseImageId='c08d86ed-46f1-44bc-9476-0cc2c6aed367', topImageId='95fefce5-7599-460f-b38c-377323659b52', bandwidth='0'}), log id: 544f03ae
2016-09-28 08:18:15,335 INFO  [org.ovirt.engine.core.bll.ConcurrentChildCommandsExecutionCallback] (DefaultQuartzScheduler8) [354939e9] Command 'RemoveSnapshot' (id: '18613dc9-d8c8-45c4-9fbe-a298e701ead5') waiting on child command id: 'fd866748-3211-4d48-9908-12eb6078a69e' type:'RemoveSnapshotSingleDiskLive' to complete
2016-09-28 08:18:15,625 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [15ef379f] Failed in 'MergeVDS' method
2016-09-28 08:18:15,628 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (pool-7-thread-2) [15ef379f] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VDSM Host04 command failed: Merge failed
2016-09-28 08:18:15,628 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [15ef379f] Command 'org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand' return value 'StatusOnlyReturnForXmlRpc [status=StatusForXmlRpc [code=52, message=Merge failed]]'
2016-09-28 08:18:15,629 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [15ef379f] HostName = Host04
2016-09-28 08:18:15,629 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [15ef379f] Command 'MergeVDSCommand(HostName = Host04, MergeVDSCommandParameters:{runAsync='true', hostId='f22d87b9-4449-4a71-8529-58095dd81b6f', vmId='eb73a967-1908-46e9-9de2-9706bf29643a', storagePoolId='77e24b20-9d21-4952-a089-3c5c592b4e6d', storageDomainId='6e5cce71-3438-4045-9d54-607123e0557e', imageGroupId='9fc0b2f6-d786-4a21-8f5c-b22b23df4aaa', imageId='95fefce5-7599-460f-b38c-377323659b52', baseImageId='c08d86ed-46f1-44bc-9476-0cc2c6aed367', topImageId='95fefce5-7599-460f-b38c-377323659b52', bandwidth='0'})' execution failed: VDSGenericException: VDSErrorException: Failed to MergeVDS, error = Merge failed, code = 52
2016-09-28 08:18:15,629 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [15ef379f] FINISH, MergeVDSCommand, log id: 544f03ae
2016-09-28 08:18:15,629 ERROR [org.ovirt.engine.core.bll.MergeCommand] (pool-7-thread-2) [15ef379f] Engine exception thrown while sending merge command: org.ovirt.engine.core.common.errors.EngineException: EngineException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed to MergeVDS, error = Merge failed, code = 52 (Failed with error mergeErr and code 52)
        at org.ovirt.engine.core.bll.VdsHandler.handleVdsResult(VdsHandler.java:114) [bll.jar:]
        at org.ovirt.engine.core.bll.VDSBrokerFrontendImpl.runVdsCommand(VDSBrokerFrontendImpl.java:33) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.runVdsCommand(CommandBase.java:2171) [bll.jar:]
        at org.ovirt.engine.core.bll.MergeCommand.executeCommand(MergeCommand.java:45) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.executeWithoutTransaction(CommandBase.java:1305) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.executeActionInTransactionScope(CommandBase.java:1447) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.runInTransaction(CommandBase.java:2075) [bll.jar:]
        at org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInNewTransaction(TransactionSupport.java:204) [utils.jar:]
        at org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInRequired(TransactionSupport.java:139) [utils.jar:]
        at org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInScope(TransactionSupport.java:107) [utils.jar:]
        at org.ovirt.engine.core.bll.CommandBase.execute(CommandBase.java:1490) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.executeAction(CommandBase.java:398) [bll.jar:]
        at org.ovirt.engine.core.bll.Backend.runAction(Backend.java:493) [bll.jar:]
        at org.ovirt.engine.core.bll.Backend.runAction(Backend.java:729) [bll.jar:]
        at sun.reflect.GeneratedMethodAccessor675.invoke(Unknown Source) [:1.8.0_101]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_101]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_101]
        at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
        at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.delegateInterception(Jsr299BindingsInterceptor.java:70) [wildfly-weld-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:80) [wildfly-weld-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:93) [wildfly-weld-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
        at org.ovirt.engine.core.bll.interceptors.CorrelationIdTrackerInterceptor.aroundInvoke(CorrelationIdTrackerInterceptor.java:13) [bll.jar:]
        at sun.reflect.GeneratedMethodAccessor140.invoke(Unknown Source) [:1.8.0_101]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_101]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_101]
        at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptor.java:89)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
        at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:73) [weld-core-impl-2.3.2.Final.jar:2.3.2.Final]
        at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:83) [wildfly-weld-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45) [wildfly-ee-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
        at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx(CMTTxInterceptor.java:263) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.supports(CMTTxInterceptor.java:374) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:243) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:66) [wildfly-ejb3-10.0.0.Final.jar:10.0.0.Final]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
        at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:636)
        at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
        at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
        at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:195)
        at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
        at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73)
        at org.ovirt.engine.core.bll.interfaces.BackendCommandObjectsHandler$$$view3.runAction(Unknown Source) [bll.jar:]
        at org.ovirt.engine.core.bll.tasks.CommandExecutor.executeCommand(CommandExecutor.java:57) [bll.jar:]
        at org.ovirt.engine.core.bll.tasks.CommandExecutor.lambda$executeAsyncCommand$0(CommandExecutor.java:46) [bll.jar:]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_101]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_101]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_101]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_101]
2016-09-28 08:18:16,038 INFO  [org.ovirt.engine.core.vdsbroker.monitoring.VmJobsMonitoring] (DefaultQuartzScheduler10) [354939e9] VM Job [4dd2b885-2452-4520-b20a-928edea50836]: In progress (no change)
2016-09-28 08:18:16,341 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler6) [354939e9] Waiting on Live Merge command step 'MERGE' to complete
2016-09-28 08:18:16,351 INFO  [org.ovirt.engine.core.bll.MergeCommandCallback] (DefaultQuartzScheduler6) [15ef379f] Merge command (jobId = null) has completed for images 'c08d86ed-46f1-44bc-9476-0cc2c6aed367'..'95fefce5-7599-460f-b38c-377323659b52'
2016-09-28 08:18:18,372 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler6) [354939e9] Executing Live Merge command step 'MERGE_STATUS'
2016-09-28 08:18:18,418 INFO  [org.ovirt.engine.core.bll.MergeStatusCommand] (pool-7-thread-1) [42d41e81] Running command: MergeStatusCommand internal: true. Entities affected :  ID: 6e5cce71-3438-4045-9d54-607123e0557e Type: Storage
2016-09-28 08:18:18,506 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.FullListVDSCommand] (pool-7-thread-1) [42d41e81] START, FullListVDSCommand(HostName = Host04, FullListVDSCommandParameters:{runAsync='true', hostId='f22d87b9-4449-4a71-8529-58095dd81b6f', vds='Host[Host04,f22d87b9-4449-4a71-8529-58095dd81b6f]', vmIds='[eb73a967-1908-46e9-9de2-9706bf29643a]'}), log id: 62d7ca75
2016-09-28 08:18:19,528 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.FullListVDSCommand] (pool-7-thread-1) [42d41e81] FINISH, FullListVDSCommand, return: [{acpiEnable=true, emulatedMachine=pc-i440fx-rhel7.2.0, afterMigrationStatus=, vmId=eb73a967-1908-46e9-9de2-9706bf29643a, memGuaranteedSize=1740, transparentHugePages=true, displaySecurePort=5907, timeOffset=-7088, cpuType=Nehalem, smp=2, guestNumaNodes=[Ljava.lang.Object;@1f96e8d8, hypervEnable=true, custom={device_66bcfc2f-fca9-4890-8bf5-74095d059da9device_de626997-b95c-45be-81f2-b2de374b5f8adevice_0faaec88-ceff-467b-85fd-6f131cfae9fadevice_ad363387-214a-4435-ab86-486feeea6ad3=VmDevice:{id='VmDeviceId:{deviceId='ad363387-214a-4435-ab86-486feeea6ad3', vmId='eb73a967-1908-46e9-9de2-9706bf29643a'}', device='spicevmc', type='CHANNEL', bootOrder='0', specParams='[]', address='{bus=0, controller=0, type=virtio-serial, port=3}', managed='false', plugged='true', readOnly='false', deviceAlias='channel2', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false', hostDevice='null'}, device_66bcfc2f-fca9-4890-8bf5-74095d059da9=VmDevice:{id='VmDeviceId:{deviceId='66bcfc2f-fca9-4890-8bf5-74095d059da9', vmId='eb73a967-1908-46e9-9de2-9706bf29643a'}', device='ide', type='CONTROLLER', bootOrder='0', specParams='[]', address='{slot=0x01, bus=0x00, domain=0x0000, type=pci, function=0x1}', managed='false', plugged='true', readOnly='false', deviceAlias='ide', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false', hostDevice='null'}, device_66bcfc2f-fca9-4890-8bf5-74095d059da9device_de626997-b95c-45be-81f2-b2de374b5f8a=VmDevice:{id='VmDeviceId:{deviceId='de626997-b95c-45be-81f2-b2de374b5f8a', vmId='eb73a967-1908-46e9-9de2-9706bf29643a'}', device='unix', type='CHANNEL', bootOrder='0', specParams='[]', address='{bus=0, controller=0, type=virtio-serial, port=1}', managed='false', plugged='true', readOnly='false', deviceAlias='channel0', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false', hostDevice='null'}, device_66bcfc2f-fca9-4890-8bf5-74095d059da9device_de626997-b95c-45be-81f2-b2de374b5f8adevice_0faaec88-ceff-467b-85fd-6f131cfae9fa=VmDevice:{id='VmDeviceId:{deviceId='0faaec88-ceff-467b-85fd-6f131cfae9fa', vmId='eb73a967-1908-46e9-9de2-9706bf29643a'}', device='unix', type='CHANNEL', bootOrder='0', specParams='[]', address='{bus=0, controller=0, type=virtio-serial, port=2}', managed='false', plugged='true', readOnly='false', deviceAlias='channel1', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false', hostDevice='null'}}, vmType=kvm, smpThreadsPerCore=1, memSize=1740, smpCoresPerSocket=2, vmName=SRV-ActPrint, nice=0, status=Up, maxMemSize=4194304, bootMenuEnable=false, guestDiskMapping={}, pid=14894, displayIp=192.168.144.104, displayPort=-1, smartcardEnable=false, maxMemSlots=16, nicModel=rtl8139,pv, kvmEnable=true, displayNetwork=ovirtmgmt, devices=[Ljava.lang.Object;@1c3c34e6, maxVCpus=32, clientIp=, statusTime=7115868520, display=qxl}], log id: 62d7ca75
2016-09-28 08:18:19,538 ERROR [org.ovirt.engine.core.bll.MergeStatusCommand] (pool-7-thread-1) [42d41e81] Failed to live merge, still in volume chain: [c08d86ed-46f1-44bc-9476-0cc2c6aed367, 95fefce5-7599-460f-b38c-377323659b52]
2016-09-28 08:18:20,422 ERROR [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler9) [354939e9] Failed child command status for step 'MERGE_STATUS'
2016-09-28 08:18:21,449 ERROR [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler8) [354939e9] Merging of snapshot '275c0570-32b6-4d50-9529-b2428f6a8a0b' images 'c08d86ed-46f1-44bc-9476-0cc2c6aed367'..'95fefce5-7599-460f-b38c-377323659b52' failed. Images have been marked illegal and can no longer be previewed or reverted to. Please retry Live Merge on the snapshot to complete the operation.
2016-09-28 08:18:21,459 INFO  [org.ovirt.engine.core.bll.ConcurrentChildCommandsExecutionCallback] (DefaultQuartzScheduler8) [354939e9] Command 'RemoveSnapshot' id: '18613dc9-d8c8-45c4-9fbe-a298e701ead5' child commands '[fd866748-3211-4d48-9908-12eb6078a69e]' executions were completed, status 'FAILED'
2016-09-28 08:18:22,564 ERROR [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand] (DefaultQuartzScheduler10) [354939e9] Ending command 'org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand' with failure.
2016-09-28 08:18:22,634 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler10) [354939e9] Correlation ID: 5a27e364, Job ID: 661f8f55-30c6-4735-bb0a-fdcd3ac4004a, Call Stack: null, Custom Event ID: -1, Message: Failed to delete snapshot 'Backup the VM' for VM 'SRV-ActPrint'.


 Vdsm.log
periodic/5740::DEBUG::2016-09-28 08:01:31,574::vm::4519::virt.vm::(queryBlockJobs) vmId=`eb73a967-1908-46e9-9de2-9706bf29643a`::Still waiting for block job 4dd2b885-2452-4520-b20a-928edea50836 to be synchronized
....
jsonrpc.Executor/5::ERROR::2016-09-28 08:33:04,783::vm::4427::virt.vm::(trackBlockJob) vmId=`eb73a967-1908-46e9-9de2-9706bf29643a`::Cannot add block job 50a359bd-097d-4c07-a7ae-5f4a9db23b81.  A block job with id 4dd2b885-2452-4520-b20a-928edea50836 already exists for image 9fc0b2f6-d786-4a21-8f5c-b22b23df4aaa
jsonrpc.Executor/5::ERROR::2016-09-28 08:33:04,784::vm::4600::virt.vm::(merge) vmId=`eb73a967-1908-46e9-9de2-9706bf29643a`::A block job is already active on this disk


Thanks.

Marcelo Leandro

2016-06-24 12:49 GMT-03:00 Nicolás <nicolas@devels.es>:
Done, you can find it in [1]. Feel free to add/modify anything you consider inaccurate.

Thank you.

 [1]: https://bugzilla.redhat.com/show_bug.cgi?id=1349950

El 24/06/16 a las 12:39, Nir Soffer escribió:

On Fri, Jun 24, 2016 at 11:39 AM, Vinzenz Feenstra <vfeenstr@redhat.com> wrote:
On Jun 24, 2016, at 9:10 AM, nicolas@devels.es wrote:

Hi,

We're trying to delete an auto-generated live snapshot that has been created after migrating an online VM's storage to a different domain. oVirt version is 3.6.6 and VDSM version is 4.17.28. Most relevant log lines are:

    2016-06-24 07:50:36,252 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-10) [799a22e3] Failed in 'MergeVDS' method
    2016-06-24 07:50:36,256 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (pool-7-thread-10) [799a22e3] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VDSM host2.domain.com command failed: Merge failed
    2016-06-24 07:50:36,256 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-10) [799a22e3] Command 'MergeVDSCommand(HostName = host2.domain.com, MergeVDSCommandParameters:{runAsync='true', hostId='c31dca1a-e5bc-43f6-940f-6397e3ddbee4', vmId='7083832a-a1a2-42b7-961f-2e9c0dcd7e18', storagePoolId='fa155d43-4e68-486f-9f9d-ae3e3916cc4f', storageDomainId='9339780c-3667-4fef-aa13-9bec08957c5f', imageGroupId='65a0b0d4-5c96-4dd9-a31b-4d08e40a46a5', imageId='9eec9e8f-38db-4abf-b1c4-92fa9383f8b1', baseImageId='568b2f77-0ddf-4349-a45c-36fcb0edecb6', topImageId='9eec9e8f-38db-4abf-b1c4-92fa9383f8b1', bandwidth='0'})' execution failed: VDSGenericException: VDSErrorException: Failed to MergeVDS, error = Merge failed, code = 52
    2016-06-24 07:50:36,256 ERROR [org.ovirt.engine.core.bll.MergeCommand] (pool-7-thread-10) [799a22e3] Engine exception thrown while sending merge command: org.ovirt.engine.core.common.errors.EngineException: EngineException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed to MergeVDS, error = Merge failed, code = 52 (Failed with error mergeErr and code 52)

I'm attaching relevant logs (both for ovirt-engine and SPM's vdsm).

What could be the reason for this error?
@Nir,

that looks like some issue in VDSM please have a look

jsonrpc.Executor/3::ERROR::2016-06-24 07:50:36,216::vm::4955::virt.vm::(merge) vmId=`7083832a-a1a2-42b7-961f-2e9c0dcd7e18`::Live merge failed (job: 3ea68e36-6d99-4af9-a54e-4c5b06df6a0f)
Traceback (most recent call last):
   File "/usr/share/vdsm/virt/vm.py", line 4951, in merge
     flags)
   File "/usr/share/vdsm/virt/virdomain.py", line 68, in f
     ret = attr(*args, **kwargs)
   File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", line 124, in wrapper
     ret = f(*args, **kwargs)
   File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 1313, in wrapper
     return func(inst, *args, **kwargs)
   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 668, in blockCommit
     if ret == -1: raise libvirtError ('virDomainBlockCommit() failed', dom=self)
libvirtError: block copy still active: disk 'vda' already in active block job
This means there was a previous attempt to merge, and the block job
did not complete yet.

Engine should detect that there is an active block job and wait until
it completes.

This is probably engine bug, please file a bug and attach complete vdsm and
engine logs.

Ala, can you look at this?

Nir

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