linux-kernel - Re: 3.5-rc3: BUG: Dentry still in use (1) [unmount of cgroup cgroup]

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Date:	Thu, 28 Jun 2012 23:09:43 +0900
From:	Masanari Iida <standby24x7@...il.com>
To:	"tj@...nel.org" <tj@...nel.org>
Cc:	shyju pv <shyju.pv@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	Sanil kumar <sanil.kumar@...wei.com>,
	Li Zefan <lizefan@...wei.com>
Subject: Re: 3.5-rc3: BUG: Dentry still in use (1) [unmount of cgroup cgroup]

Hello

I have applied this patch on 3.5-rc4, and tested.
It didn't fix the symptom. :(

Masanari


On Thu, Jun 28, 2012 at 8:02 AM, tj@...nel.org <tj@...nel.org> wrote:
> Hello,
>
> Does the following patch make the problem go away?
>
> Thank you.
>
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 2097684..f9556cf 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -3644,6 +3644,7 @@ static void cgroup_event_remove(struct work_struct *work)
>        eventfd_ctx_put(event->eventfd);
>        kfree(event);
>        dput(cgrp->dentry);
> +       deactivate_super(cgrp->root->sb);
>  }
>
>  /*
> @@ -3770,6 +3771,7 @@ static int cgroup_write_event_control(struct cgroup *cgrp, struct cftype *cft,
>         * destroying subsystem state objects. Let's take reference to cgroup
>         * directory dentry to do that.
>         */
> +       atomic_inc(&cgrp->root->sb->s_active);
>        dget(cgrp->dentry);
>
>        spin_lock(&cgrp->event_list_lock);
--
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