virsh list hangs / guests not starting automatically

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I followed the wiki[1] to create a KVM virtual machine using bridged
network on CentOS 6.5.  It seemed to work fine on initial setup.
(FWIW I'm trying to run a MythBuntu guest.) However, after a reboot,
it doesn't auto-start the VMs.

Shortly after boot, if I go into "virsh", then do a "list", it just
hangs.  Likewise, if I go into "virt manager", it just hangs with the
message "connecting".

Kernel version is: 2.6.32-431.29.2.el6.x86_64

Relevant package versions:

libvirt.x86_64                       0.10.2-29.el6_5.12
libvirt-client.x86_64                0.10.2-29.el6_5.12
libvirt-python.x86_64                0.10.2-29.el6_5.12
python-virtinst.noarch               0.600.0-18.el6
virt-manager.x86_64                  0.9.0-19.el6
virt-top.x86_64                      1.0.4-3.15.el6
virt-viewer.x86_64                   0.5.6-8.el6_5.3
qemu-img.x86_64                      2:0.12.1.2-2.415.el6_5.14
qemu-kvm.x86_64                      2:0.12.1.2-2.415.el6_5.14

CPU is a Xeon E3-1230v3.  I have the virtualization setting enabled in the BIOS.

I googled on this, and saw a bunch of talk about two years ago
regarding issues with the libvirt packages having a deadlock bug.  But
I think the versions of the relevant packages that I have installed
are new enough to have fixes for that.

I also happened across an earlier post to this list[2], where it
seemed someone was having a similar problem.  I was previously
attempting to use balance-rr and 802.3ad bonding modes on my host.
However, I just changed to using "active-backup" and the problem
remains.

I have in /etc/libvirt/libvirtd.conf the following three lines (the
rest is stock, i.e. all comments):
log_level = 2
log_filters=""
log_outputs="1:file:/var/log/libvirt/libvirt.log"

Below I posted the contents of the libvirt log file after doing a
"service libvirt start".

Anyone ever fought this before?

Thanks!

[1] http://wiki.centos.org/HowTos/KVM
[2] http://lists.centos.org/pipermail/centos-virt/2014-March/003722.html

/var/log/libvirt/libvirt.log output:
2014-10-14 16:47:11.150+0000: 4657: info : libvirt version: 0.10.2,
package: 29.el6_5.12 (CentOS BuildSystem <http://bugs.centos.org>,
2014-09-01-13:44:02, c6b8.bsys.dev.centos.org)
2014-10-14 16:47:11.150+0000: 4657: info :
virNetlinkEventServiceStart:517 : starting netlink event service with
protocol 0
2014-10-14 16:47:11.151+0000: 4657: info :
virNetlinkEventServiceStart:517 : starting netlink event service with
protocol 15
2014-10-14 16:47:11.154+0000: 4668: info :
dnsmasqCapsSetFromBuffer:667 : dnsmasq version is 2.48, --bind-dynamic
is NOT present, SO_BINDTODEVICE is NOT in use
2014-10-14 16:47:11.157+0000: 4668: info :
networkReloadIptablesRules:1925 : Reloading iptables rules
2014-10-14 16:47:11.157+0000: 4668: info : networkRefreshDaemons:1287
: Refreshing network daemons
2014-10-14 16:47:11.278+0000: 4668: info : networkStartNetwork:2422 :
Starting up network 'default'
2014-10-14 16:47:11.290+0000: 4668: info :
virStorageBackendVolOpenCheckMode:1085 : Skipping special dir '.'
2014-10-14 16:47:11.290+0000: 4668: info :
virStorageBackendVolOpenCheckMode:1085 : Skipping special dir '..'
2014-10-14 16:47:11.352+0000: 4668: info : qemudStartup:754 : Unable
to create cgroup for driver: No such device or address
2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 :
Configured cgroup controller 'cpu'
2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 :
Configured cgroup controller 'cpuacct'
2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 :
Configured cgroup controller 'cpuset'
2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 :
Configured cgroup controller 'memory'
2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 :
Configured cgroup controller 'devices'
2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 :
Configured cgroup controller 'blkio'
2014-10-14 16:47:11.509+0000: 4668: info :
virDomainLoadAllConfigs:14696 : Scanning for configs in
/var/run/libvirt/qemu
2014-10-14 16:47:11.527+0000: 4668: info :
virDomainLoadAllConfigs:14696 : Scanning for configs in
/etc/libvirt/qemu
2014-10-14 16:47:11.527+0000: 4668: info :
virDomainLoadAllConfigs:14718 : Loading config file 'mythbuntu.xml'
2014-10-14 16:47:11.529+0000: 4668: info : qemuDomainSnapshotLoad:484
: Scanning for snapshots for domain mythbuntu in
/var/lib/libvirt/qemu/snapshot/mythbuntu
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