From mboxrd@z Thu Jan  1 00:00:00 1970
From: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Subject: Re: [PATCH 09/10] cgroup: introduce struct cfent
Date: Tue, 20 Mar 2012 18:05:29 +0400
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To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: ctalbott-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, rni-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-Id: containers.vger.kernel.org

On 03/17/2012 03:36 AM, Tejun Heo wrote:
> +static void cgroup_clear_directory(struct dentry *dir)
> +{
> +	struct cgroup *cgrp = __d_cgrp(dir);
> +
> +	while (!list_empty(&cgrp->files))
> +		cgroup_rm_file(cgrp, NULL);
> +	WARN_ON_ONCE(!list_empty(&dir->d_subdirs));
>   }


I am hitting this warning here under pretty much normal conditions.
You forgot to account for trivial directories like "."

I'll send a patch ontop of what you have.