Hello:

Yesterday I yum update libvirt from 0.9.10 to 0.10.2 ,after update I got some error in libvirtd.log

like this:

2013-05-10 07:39:09.440+0000: 18824: warning : virCgroupMoveTask:885 : no vm cgroup in controller 3

2013-05-10 07:39:09.440+0000: 18824: warning : virCgroupMoveTask:885 : no vm cgroup in controller 4

2013-05-10 07:39:09.440+0000: 18824: warning : virCgroupMoveTask:885 : no vm cgroup in controller 6

so,I restarted cgconfig and libvirtd daemon :

service cgconfig restart ;

service libvirtd restart

after that ,I cannot create snapshot for vm anymore.and error log message below:

2013-05-16 01:13:23.638+0000: 28848: error : qemuDomainSnapshotCreateDiskActive:11299 : internal error Unable to find cgroup for vm1

my version info :

# rpm -q libvirt

libvirt-0.10.2-18.el6_4.4.x86_64

# rpm -q qemu-kvm

qemu-kvm-0.12.1.2-2.295.el6_3.1.x86_64

in /cgroup dir I cannot find anything about vm1.how can I recover the missing cgroup for vm ?

thanks !