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