Created attachment 922156 [details]
vdsm+engine logs

Description of problem:

vdsm reports:
 "Thread-567::ERROR::2014-07-29 16:37:45,012::vm::5542::vm.Vm::(merge) vmId=`f4aa40f2-8b43-427a-bdfd-bf790ebe6ff8`::merge: base volume '9c9f9c84-278e-4711-a9c6-7ebcf50a0dda' not found"

when trying to live merge a snapshot,engine throws several exceptions seemingly concerning vdsm's failure 

"Failed to live merge, still in volume chain[]"

2014-07-29 16:37:43,179 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [154700c3] Failed in MergeVDS method
  2014-07-29 16:37:43,180 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [154700c3] Command org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand retu  rn value·
   StatusOnlyReturnForXmlRpc [mStatus=StatusForXmlRpc [mCode=52, mMessage=Merge failed]]
  2014-07-29 16:37:43,189 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [154700c3] HostName = vdsb
  2014-07-29 16:37:43,203 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [154700c3] Command MergeVDSCommand(HostName = vdsb, MergeVDSCommandParameters{Hos  tId = b20b9d2d-d5de-4bef-ab1a-d044df43d90b, vmId=f4aa40f2-8b43-427a-bdfd-bf790ebe6ff8, storagePoolId=00000002-0002-0002-0002-000000000200, storageDomainId=c0259524-af0c-4860-b6fc-58cbd8e97f  68, imageGroupId=8400c2f4-e0c7-4eff-aca2-65448d2cf81c, imageId=2758889b-2b68-4c64-9e04-a92d84281e7a, baseImageId=9c9f9c84-278e-4711-a9c6-7ebcf50a0dda, topImageId=73c14704-db08-403f-9b32-79f  83b1243ab, bandwidth=0}) execution failed. Exception: VDSErrorException: VDSGenericException: VDSErrorException: Failed to MergeVDS, error = Merge failed, code = 52
  2014-07-29 16:37:43,244 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] (pool-7-thread-2) [154700c3] FINISH, MergeVDSCommand, log id: 6549f990
  2014-07-29 16:37:43,250 ERROR [org.ovirt.engine.core.bll.MergeCommand] (pool-7-thread-2) [154700c3] Command org.ovirt.engine.core.bll.MergeCommand throw Vdc Bll exception. With error messag  e VdcBLLException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed to MergeVDS, error = Merge failed, code = 52 (Failed with erro  r mergeErr and code 52)
  2014-07-29 16:37:43,280 ERROR [org.ovirt.engine.core.bll.MergeCommand] (pool-7-thread-2) [154700c3] Transaction rolled-back for command: org.ovirt.engine.core.bll.MergeCommand.
  2014-07-29 16:37:52,927 INFO  [org.ovirt.engine.core.bll.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler_Worker-15) [4a7d215a] Waiting on Live Merge command step MERGE to compl  ete
  2014-07-29 16:37:52,956 INFO  [org.ovirt.engine.core.bll.MergeCommandCallback] (DefaultQuartzScheduler_Worker-15) [154700c3] Merge command has completed for images 9c9f9c84-278e-4711-a9c6-7  ebcf50a0dda..73c14704-db08-403f-9b32-79f83b1243ab
  2014-07-29 16:37:52,966 INFO  [org.ovirt.engine.core.bll.RemoveSnapshotCommandCallback] (DefaultQuartzScheduler_Worker-15) [154700c3] Waiting on Live Merge child commands to complete
  2014-07-29 16:38:02,977 INFO  [org.ovirt.engine.core.bll.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler_Worker-44) [4a7d215a] Executing Live Merge command step MERGE_STATUS
  2014-07-29 16:38:03,027 INFO  [org.ovirt.engine.core.bll.RemoveSnapshotCommandCallback] (DefaultQuartzScheduler_Worker-44) Waiting on Live Merge child commands to complete
  2014-07-29 16:38:03,029 INFO  [org.ovirt.engine.core.bll.MergeStatusCommand] (pool-7-thread-3) [5339fe0b] Running command: MergeStatusCommand internal: true. Entities affected :  ID: c02595  24-af0c-4860-b6fc-58cbd8e97f68 Type: Storage
  2014-07-29 16:38:03,050 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.FullListVdsCommand] (pool-7-thread-3) [5339fe0b] START, FullListVdsCommand(HostName = vdsb, HostId = b20b9d2d-d5de-4  bef-ab1a-d044df43d90b, vds=Host[vdsb,b20b9d2d-d5de-4bef-ab1a-d044df43d90b], vmIds=[f4aa40f2-8b43-427a-bdfd-bf790ebe6ff8]), log id: 2022a280
  2014-07-29 16:38:03,074 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.FullListVdsCommand] (pool-7-thread-3) [5339fe0b] FINISH, FullListVdsCommand, return: [{displaySecurePort=5901, kvmEn  able=true, nicModel=rtl8139,pv, keyboardLayout=en-us, displayIp=10.35.116.2, pauseCode=NOERR, nice=0, displayNetwork=ovirtmgmt, copyPasteEnable=true, timeOffset=0, transparentHugePages=true  , vmId=f4aa40f2-8b43-427a-bdfd-bf790ebe6ff8, acpiEnable=true, custom={}, spiceSslCipherSuite=DEFAULT, memSize=1024, smp=1, displayPort=5900, emulatedMachine=rhel6.5.0, vmType=kvm, status=Up  , memGuaranteedSize=1024, display=qxl, pid=1628, smartcardEnable=false, bootMenuEnable=false, spiceSecureChannels=smain,sinputs,scursor,splayback,srecord,sdisplay,susbredir,ssmartcard, numa  Tune={mode=preferred}, smpCoresPerSocket=1, maxVCpus=160, clientIp=, devices=[Ljava.lang.Object;@41da91fb, vmName=vm_1, fileTransferEnable=true, cpuType=Nehalem}], log id: 2022a280
  2014-07-29 16:38:03,100 ERROR [org.ovirt.engine.core.bll.MergeStatusCommand] (pool-7-thread-3) [5339fe0b] Failed to live merge, still in volume chain: []
  2014-07-29 16:38:03,140 ERROR [org.ovirt.engine.core.bll.MergeStatusCommand] (pool-7-thread-3) [5339fe0b] Transaction rolled-back for command: org.ovirt.engine.core.bll.MergeStatusCommand.
  2014-07-29 16:38:13,033 ERROR [org.ovirt.engine.core.bll.RemoveSnapshotSingleDiskLiveCommand] (DefaultQuartzScheduler_Worker-29) [4a7d215a] Failed to merge: failed child command status for   step MERGE_STATUS
  2014-07-29 16:38:13,048 INFO  [org.ovirt.engine.core.bll.RemoveSnapshotCommandCallback] (DefaultQuartzScheduler_Worker-29) [18925ea3] All Live Merge child commands have completed, status FA  ILED
  2014-07-29 16:38:23,100 ERROR [org.ovirt.engine.core.bll.RemoveSnapshotCommand] (DefaultQuartzScheduler_Worker-72) [18925ea3] Ending command with failure: org.ovirt.engine.core.bll.RemoveSn  apshotCommand
  2014-07-29 16:38:23,263 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler_Worker-72) [18925ea3] Correlation ID: 18925ea3, Call Stack: null  , Custom Event ID: -1, Message: Failed to delete snapshot '11' for VM 'vm_1'.

Version-Release number of selected component (if applicable):
beta.2

How reproducible:
100%

Steps to Reproduce:
1.delete a middle snapshot in a running vm(have two at least)

Actual results:
vdsm fails to locate base volume which leads to engine's exceptions and failure

Expected results:
operation should succeed 

Additional info: