It's a tiny fix to update unix monitor timeout from 3 to 30(seconds). Update libvirt to libvirt-0.10.2-32.el6, and following the steps in https://bugzilla.redhat.com/show_bug.cgi?id=892273#c19, domain can start normally.
If change the TIMEOUT in the qemu wrapper to more than 30 seconds, it will fail as expected:
# virsh start rhel6
error: Failed to start domain rhel6
error: internal error Timed out while reading console log output:
So move bug to VERIFIED.
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-2014-1374.html
Hopefully fixed upstream by v1.2.1-11-gfe89b68: commit fe89b687a02d1a8e1dce695a67b4f9d2c254d7b9 Author: Martin Kletzander <mkletzan> Date: Thu Jan 9 07:57:59 2014 +0100 qemu: Change the default unix monitor timeout