Created attachment 875940 [details]
engine logs

Description of problem:
Attempting to export a thin-provision vm with multiple disks and its template in parallel fails during endAction of exportVm with the following exception, and the vm and disks remain locked:

2014-03-18 14:39:30,890 ERROR [org.ovirt.engine.core.bll.CommandAsyncTask] (org.ovirt.thread.pool-4-thread-15) [within thread]: endAction for action type ExportVm threw an exception.: javax.ejb.EJBTransactionRolle
dbackException: CallableStatementCallback; SQL [{call updateimagestatus(?, ?)}]; ERROR: deadlock detected
  Detail: Process 9079 waits for ShareLock on transaction 13418; blocked by process 8489.
Process 8489 waits for ShareLock on transaction 13417; blocked by process 9079.
  Hint: See server log for query details.
  Where: SQL statement "SELECT 1 FROM ONLY "public"."images" x WHERE "image_guid" OPERATOR(pg_catalog.=) $1 FOR SHARE OF x"
SQL statement "UPDATE images SET imageStatus =  $1  WHERE image_guid =  $2 "
PL/pgSQL function "updateimagestatus" line 2 at SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: deadlock detected
  Detail: Process 9079 waits for ShareLock on transaction 13418; blocked by process 8489.
Process 8489 waits for ShareLock on transaction 13417; blocked by process 9079.
  Hint: See server log for query details.
  Where: SQL statement "SELECT 1 FROM ONLY "public"."images" x WHERE "image_guid" OPERATOR(pg_catalog.=) $1 FOR SHARE OF x"
SQL statement "UPDATE images SET imageStatus =  $1  WHERE image_guid =  $2 "
PL/pgSQL function "updateimagestatus" line 2 at SQL statement
       at .......

Version-Release number of selected component (if applicable):
rhevm-3.4.0-0.3.master.el6ev.noarch

How reproducible:
?

Steps to Reproduce:
1. Create template from a vm with multiple disks
2. Create vm from template (thin-provision, *not* clone)
3. Start exporting template
4. start exporting vm (dialog will display warning about template not existing on target domain -> click OK to start the export)

Actual results:
Fails to export vm

Expected results:
Should succeed in exporting vm and template in parallel

Additional info: