On 12/05/2013 11:50 PM, Tejun Heo wrote:
On Thu, Dec 05, 2013 at 11:10:51AM +0800, Yuanhan Liu wrote:
Greetings,

I got the below dmesg and the first bad commit is

commit 4b93dc9b1c684d0587fe44d36bbfdf45bd3bea9d
Author:     Tejun Heo <t...@kernel.org>
AuthorDate: Thu Nov 28 14:54:43 2013 -0500
Commit:     Greg Kroah-Hartman <gre...@linuxfoundation.org>
CommitDate: Fri Nov 29 18:16:08 2013 -0800

     sysfs, kernfs: prepare mount path for kernfs

Oops, can you please try the following patch?

Thanks.

diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index e7e3aa8..8d07527 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -45,8 +45,10 @@ static struct dentry *sysfs_mount(struct file_system_type 
*fs_type,

  static void sysfs_kill_sb(struct super_block *sb)
  {
+       void *ns = (void *)kernfs_super_ns(sb);
+
        kernfs_kill_sb(sb);
-       kobj_ns_drop(KOBJ_NS_TYPE_NET, (void *)kernfs_super_ns(sb));
+       kobj_ns_drop(KOBJ_NS_TYPE_NET, ns);
  }

  static struct file_system_type sysfs_fs_type = {

I've had the same problem with linux-next-20131209 and this patch fixed it. Feel free to add if appropriate:

Tested-by: Vlastimil Babka <vba...@suse.cz>

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