I googled this error. It seems a Fedora error. It is report that disabling sandbox service and restarting the computer can fix the problem. However the cause is not clear, the bug remains 'new' on the bugzilla. The link is
https://bugzilla.redhat.com/show_bug.cgi?id=808795#c31


于 2012年05月23日 03:52, Dan Kenigsberg 写道:
On Tue, May 22, 2012 at 05:02:01PM +0800, ShaoHe Feng wrote:
both mountTests  and parted_utils_tests failed.

Failed where? On your own host? Is it reproducible? We had a similar,
but transient, problem in
http://jenkins.ovirt.org/job/vdsm_unit_tests/143/console

We, or some other suite using the server, may be leaking a loop device.
Eyal Edri, do you know what has made this go away in run #144?


the test execute  'mount' and 'umount' command. after the umount
command, the loop device can not be freed

here is the log:
   -------------------->>  begin captured logging<<  --------------------
   Storage.Misc.excCmd: DEBUG: 'dd if=/dev/zero of=/tmp/tmpH2KSCr
bs=100M count=1' (cwd None)
   Storage.Misc.excCmd: DEBUG: SUCCESS:<err>  = '1+0 records in\n1+0
records out\n104857600 bytes (105 MB) copied, 0.266024 s, 39  4
MB/s\n';<rc>  = 0
   Storage.Misc.excCmd: DEBUG: 'losetup -f --show /tmp/tmpH2KSCr' (cwd None)
   Storage.Misc.excCmd: DEBUG: FAILED:<err>  = 'losetup: could not
find any free loop device\n';<rc>  = 255
   --------------------->>  end captured logging<<  ---------------------

Does your Linux host have a trace of the generated loop device?
What says
     losetup  -a
?
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--
Thanks and best regards!

Zhou Zheng Sheng / 周征晟
E-mail: zhshz...@linux.vnet.ibm.com
Telephone: 86-10-82454397

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