[Devel] Re: lxc-start: Device or resource busy - failed to remove previous cgroup

[Balbir Singh]

On Mon, Jan 4, 2010 at 6:40 AM, Dwight Schauer <dschauer at gmail.com> wrote:
>
> I'm starting to get is quite regularly, but not every time:
>
> lxc-start: Device or resource busy - failed to remove previous cgroup
> '/cgroup/CONTAINER_NAME'
>

Can you please paste the output of cat /proc/cgroups and cat /proc/mounts

> lxc version: 0.6.3
>
> Cgroup memory controller: disabled (everything else is enabled)
>

Oh! man...

> Linux version 2.6.30-bpo.1-amd64 (Debian 2.6.30-6~bpo50+1)
> (nobse at debian.org) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) #1 SMP Mon
> Aug 17 08:42:50 UTC 2009
>
> This only seems to be happening when the primary started in the
> container exits before all child processes have exited.
>
> I've not seem this happen with lxc-stop, only when quitting a "pseudo"
> init process.
>
> I've tried destroying and recreating the container, un=mounting and
> remounting the given container, none work in that situation. Rebooting
> the root-node does correct the problem.
>

This should not really happen, /proc/cgroups will help us figure out what
is going on. As an alternative, if you can compile the debug cgroup container,
you'll get a lot of useful debug information (CONFIG_CGROUP_DEBUG).

Balbir
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