This bug has been copied from bug #822373 and has been proposed to be backported to 6.3 z-stream (EUS).
Verified with versions: # rpm -q libvirt libvirt-0.9.10-21.el6_3.2.x86_64 Following the steps in bug 822373 Description. 300 times loop attach/detach all successfully.
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/RHBA-2012-1095.html