[lxc-users] cgmanager: cgm_list_children for controller=systemd, cgroup_path=user failed: invalid request

[Smart Goldman]

Hello.

I know about neither PAM nor cgmanager very well.
But since my ubuntu server outputs a cgmanager-related error and I can not
solve it myself, please allow me to ask a question.
I apologize to you all if question about cgmanager is not allowed here.

Ubuntu 14.04.1 LTS 64bit minimal is running as an OS on contracted VPS
service by OpenVZ.
The following error message is output to /var/log/auth.log by rebooting
server.

/var/log/auth.log
Jan 12 02:27:05 myhost systemd-logind[297]: cgmanager: cgm_list_children
for controller=systemd, cgroup_path=user failed: invalid request
Jan 12 02:27:05 myhost systemd-logind[297]: New seat seat0.
Jan 12 02:27:06 myhost sshd[493]: Server listening on 0.0.0.0 port 22.
Jan 12 02:27:06 myhost sshd[493]: Server listening on :: port 22.

It looks like it is output soon after installing cgroup-bin and
cgmanager-utils.
What is the cause of the problem?
Or is this ignorable error message?

Thank you in advance.
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