linux-kernel - Re: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:20

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Date:	Thu, 5 Dec 2013 17:50:19 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: BUG: sleeping function called from invalid context at
 kernel/locking/rwsem.c:20

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 <tj@...nel.org>
> AuthorDate: Thu Nov 28 14:54:43 2013 -0500
> Commit:     Greg Kroah-Hartman <gregkh@...uxfoundation.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 = {
--
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