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

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Message-ID: <20120627230230.GT15811@google.com>
Date:	Wed, 27 Jun 2012 16:02:30 -0700
From:	"tj@...nel.org" <tj@...nel.org>
To:	shyju pv <shyju.pv@...wei.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	Sanil kumar <sanil.kumar@...wei.com>,
	Masanari Iida <standby24x7@...il.com>,
	Li Zefan <lizefan@...wei.com>
Subject: Re: 3.5-rc3: BUG: Dentry still in use (1) [unmount of cgroup
 cgroup]

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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