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Description of problem:
When destroy libvirt default virtual network, there's 2 error message loged libvirtd.log.


Version-Release number of selected component (if applicable):
100%

How reproducible:
1.Destroy the default virtual network 
# virsh net-list
Name                 State      Autostart
-----------------------------------------
default              active     yes  
# virsh net-destroy default
Network default destroyed

2. Check the libvirtd.log
------
2012-09-14 08:36:37.665+0000: 7575: info : libvirt version: 0.10.1, package: 2.el6 (Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2012-09-13-00:00:13, x86-009.build.bos.redhat.com)
2012-09-14 08:36:37.665+0000: 7575: error : virCommandWait:2332 : internal error Child process (/sbin/tc qdisc del dev virbr0 root) unexpected exit status 2: RTNETLINK answers: No such file or directory

2012-09-14 08:36:37.670+0000: 7575: error : virCommandWait:2332 : internal error Child process (/sbin/tc qdisc del dev virbr0 ingress) unexpected exit status 2: RTNETLINK answers: Invalid argument
------

  
Actual results:
2 error messages logged.

Expected results:
No such error.

Additional info:

BTW, The version is libvirt-0.10.1-2.el6.x86_64.

Moving to POST:

commit 2f678bb10faccba30319488420c586b6a5436f94
Author: Martin Kletzander <mkletzan>
Date:   Tue Sep 18 12:01:18 2012 +0200

    virNetDevBandwidthClear: Improve error handling

Test with libvirt-0.10.2-1.el6.x86_64, bug fixed.
When destroy the default network, no such errors in libvirtd.log.

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-2013-0276.html