[CentOS-virt] libvirt stuck when executing 2 or more parallel calls

Hello,

Recently built RPM package libvirt-4.3.0-1.xen48.el6 (
https://cbs.centos.org/koji/buildinfo?buildID=25235 ) has following issue:

When trying to run two or more virus commands (2 or more simultaneous calls
to libvirtd) we got virsh stuck. See attached strace log.

What could be possible cause?

Thanks,
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