libvirtd hangs when accessed too frequently (race conditions?)

It seems that there are some concurrency problems with libvirt. I had the following script:

#!/usr/bin/python

import os, time





for i in xrange(1000):

print i

os.system('virsh restore /aml/images/pr51.img')

print "a"



os.system('virsh save pr51 /aml/images/pr51.img')

However, this script would hang libvirtd, the libvirt daemon, after awhile.

I ended up having to put sleep(3) after both os.system calls in order to make it work. I guess that the libvirt people haven't fixed this concurrency problem yet.