[vserver] Mounting cgroup-hierarchy failed...

Hi,
I just updated a few packages on my server, but after rebooting
I get these messages:
-----
* Mounting cgroup-hierarchy ...
mount: vserver already mounted or /dev/cgroup busy [ !! ]
* ERROR: util-vserver failed to start
* ERROR: cannot start vservers.default as util-vserver would not start
-----

So I tried to start it manually after boot, but it failed again:

-----
obelix ~ # /etc/init.d/util-vserver start
  * Creating directories for util-vserver ... [ ok ]
  * Setting vshelper path to /usr/lib64/util-vserver/vshelper [ ok ]
  * Loading default device map ... [ ok ]
  * Mounting cgroup-hierarchy ...
mount: vserver already mounted or /dev/cgroup busy [ !! ]
  * ERROR: util-vserver failed to start
obelix ~ #
-----

So where is the problem? It all worked till yesterday, but now
suddenly I can not start vservers anymore. I am not sure which
packages I updated recently, but it was neither kernel nor
vserver-patches/utils...

Jarry

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