Created attachment 579535 [details]
logs

Since RHEL 6.3 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.

After the 1st delete image issued, new operations on this image should be prevented.

If the operation (task) is lost, engine should check the status of the image and not the lost task.

The image should be unusable until the data and metadata integrity were positively verified.

Dafna, I'm getting an exception when trying to extract the logs.
Eduardo, I'm not sure I follow your solution, 
if we prevent the user to send again the delete command, how he should get out of this condition.
The user might also have problem in any operation regarding the VM (like remove for example)

Regarding the logs, I now managed to open them, (guess there was some temporary network issue).

Now that I see the log, I see the VDSM reported the task as finished

Thread-284::DEBUG::2012-04-22 16:34:18,319::taskManager::93::TaskManager::(getTaskStatus) Entry. taskID: 4fd7432b-ec34-4ebe-b140-df61ae789586
Thread-284::DEBUG::2012-04-22 16:34:18,319::taskManager::96::TaskManager::(getTaskStatus) Return. Response: {'code': 252, 'message': 'Error merging snapshots', 'taskState': 'finished', 'taskResult': 'cleanSuccess', 'taskID': '4fd7432b-ec34-4ebe-b140-df61ae789586'}
Thread-284::DEBUG::2012-04-22 16:34:18,320::taskManager::112::TaskManager::(getAllTasksStatuses) Return: {'4fd7432b-ec34-4ebe-b140-df61ae789586': {'code': 252, 'message': 'Error merging snapshots', 'taskState': 'finished', 'taskResult': 'cleanSuccess', 'taskID': '4fd7432b-ec34-4ebe-b140-df61ae789586'}}
Thread-284::INFO::2012-04-22 16:34:18,320::logUtils::39::dispatcher::(wrapper) Run and protect: getAllTasksStatuses, Return response: {'allTasksStatus': {'4fd7432b-ec34-4ebe-b140-df61ae789586': {'code': 252, 'message': 'Error merging snapshots', 'taskState': 'finished', 'taskResult': 'cleanSuccess', 'taskID': '4fd7432b-ec34-4ebe-b140-df61ae789586'}}}
Thread-284::DEBUG::2012-04-22 16:34:18,321::task::1172::TaskManager.Task::(prepare) Task=`4ae9d40d-ea76-4886-88df-b2849ea22a97`::finished: {'allTasksStatus': {'4fd7432b-ec34-4ebe-b140-df61ae789586': {'code': 252, 'message': 'Error merging snapshots', 'taskState': 'finished', 'taskResult': 'cleanSuccess', 'taskID': '4fd7432b-ec34-4ebe-b140-df61ae789586'}}}

so, I move back the need info to Eduardo, regarding comment 5.

In addition thread is waiting in a resource 29f4cfaa-27a2-42e7-bfdf-c28df879ce48 that seems to be steal (until the end of the log) after thread 4ae9d40dea76-4886-88df-b2849ea22a97 exit.
Need to find why.

Movin to infra, as agreed.

Ended up not being infra after all.
http://gerrit.ovirt.org/#/c/8667/

The issue, as we agreed, is a task cleared without releasing the resources.

The task failing leaving "prepared" volumes is only the trigger and not the problem.

Clear the task should release the resources.

In addition resource logs in spite to be very verbose were of little help to understand the issue.

These are infra problems.

*** Bug 864902 has been marked as a duplicate of this bug. ***

No, because the resource is not taken in the task context so the task is not responsible for freeing it.

verified on si24

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-1508.html