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

[tj@xxxxxxxxxx]

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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