[lxc-users] Containers not shutting down

[Serge Hallyn]

Quoting Mark Constable (markc at renta.net):
> Ubuntu 15.04 w/ btrfs.
> 
> Since the past 2 days of updates I notice my lxc and lxd containers just hang
> when trying to shut them down, consequently rebooting my laptop requires a
> hard power button reset (so far btrfs on a SSD has survived). Also my main
> system privileged container does not provide any output for free and top and
> even an apt-get upgrade just hangs (hence I can't get systemd 219-4ubuntu7).

Do any of the tasks in the container stick around after shutdown?

> The above is FWIW but this one I am not sure where to start looking to track
> down how to fix this?... any hints appreciated.
> 
> Mar 20 15:36:30 sysadm.lan systemd[1]:
>  Failed to reset devices.list on
>  /lxc/sysadm.lan/system.slice/courier-authdaemon.service: Permission denied
> 
> ie; where is /lxc/ ?

It's the top-level cgroup, so you'd actually find it at

/sys/fs/cgroup/devices/lxc

> If I try a hunch and check where lxcfs is mounted on the host a listing of
> that mount point also just hangs...
> 
> ~ mount | grep lxc
> lxcfs on /var/lib/lxcfs type fuse.lxcfs (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other)
> 
> ~ ll /var/lib/lxcfs
> ^C
> [hangs]
> 
> As far as I can remember this started about Wed 18th March.
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