[libvirt] libvirt 2.3.0 and later versions hanging

Hi, I am starting a libvritd process when booting up an embedded networking system via python, like so: subprocess.Popen(["libvirtd","-d"],stdout=subprocess.PIPE,stderr=subprocess.PIPE) This runs and works fine for version 1.2.20. However after I upgraded to 2.3.0 I started noticing an intermittent bug. Sometimes my CLI will hang when libvirtd is starting (most of the time it starts fine). I ssh'd in and had a look around. libvirtd had a second process entry: [root@trx-r2 log]# ps ax | grep libvirt 826 ? Sl 0:00 libvirtd -d 843 ? S 0:00 libvirtd -d 869 pts/0 S+ 0:00 grep libvirt Using strace I could see the second entry was blocking (FUTEX). Kill libvirtd processes and the boot continues as normal. I updated libvirt to the latest version and this still happens. To confirm I downgraded to 1.2.20 again and everything works smoothly. Any idea of what may have changed to cause this, pointers for me as to where to have a look? Thanks, -- Paul