Hm, my last email (which I may have accidentally sent privately) was wrong,
/proc/$$/mounts shows cgroups in fact mounted at /sys/fs/cgroup.
However, take a look at this:

> cgroup /sys/fs/cgroup/cpuset cgroup rw,relatime,cpuset,clone_children 0 0
> cgroup /sys/fs/cgroup/cpu cgroup rw,relatime,cpu 0 0

These are different from the rest,

> cgmfs /run/cgmanager/fs tmpfs rw,relatime,size=100k,mode=755 0 0
> cgroup /sys/fs/cgroup/cpuacct cgroup 
> rw,relatime,cpuacct,release_agent=/run/cgmanager/agents/cgm-release-agent.cpuacct
>  0 0
> cgroup /sys/fs/cgroup/memory cgroup 
> rw,relatime,memory,release_agent=/run/cgmanager/agents/cgm-release-agent.memory
>  0 0
> cgroup /sys/fs/cgroup/devices cgroup 
> rw,relatime,devices,release_agent=/run/cgmanager/agents/cgm-release-agent.devices
>  0 0
> cgroup /sys/fs/cgroup/freezer cgroup 
> rw,relatime,freezer,release_agent=/run/cgmanager/agents/cgm-release-agent.freezer
>  0 0
> cgroup /sys/fs/cgroup/blkio cgroup 
> rw,relatime,blkio,release_agent=/run/cgmanager/agents/cgm-release-agent.blkio 
> 0 0
> cgroup /sys/fs/cgroup/perf_event cgroup 
> rw,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-release-agent.perf_event
>  0 0
> cgroup /sys/fs/cgroup/hugetlb cgroup 
> rw,relatime,hugetlb,release_agent=/run/cgmanager/agents/cgm-release-agent.hugetlb
>  0 0
> name=systemd /sys/fs/cgroup/systemd cgroup 
> rw,relatime,release_agent=/run/cgmanager/agents/cgm-release-agent.systemd,name=systemd
>  0 0
> binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc 
> rw,nosuid,nodev,noexec,relatime 0 0

So something is pre-mounting these filesystems before cgmanager starts.
What mounted those?  I thought I'd asked for this before, but I don't
see it in the thread - what does "dpkg -l | grep cgroup" show?  In
particular I'm looking for cgroup-bin.
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