[libvirt-users] snapshot create error, unable to find cgroup for vm

[Gao Yongwei]

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 !
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