linux-kernel - Re: WARNING: at fs/sysfs/sysfs.h:195 (during boot)

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Date:	Tue, 15 Nov 2011 16:39:49 -0800
From:	Greg KH <gregkh@...e.de>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: WARNING: at fs/sysfs/sysfs.h:195 (during boot)

On Sun, Nov 13, 2011 at 08:24:17PM +0100, Markus Trippelsdorf wrote:
> I'm seeing this for the fist time:
> 
> ...
> XFS (sda): Mounting Filesystem
> XFS (sda): Ending clean mount
> ATL1E 0000:02:00.0: irq 40 for MSI/MSI-X
> ATL1E 0000:02:00.0: eth0: NIC Link is Up <100 Mbps Full Duplex>
> ATL1E 0000:02:00.0: eth0: NIC Link is Up <100 Mbps Full Duplex>
> udevd[888]: starting version 171
> ------------[ cut here ]------------
> WARNING: at fs/sysfs/sysfs.h:195 sysfs_get_inode+0x136/0x140()
> Hardware name: System Product Name
> Pid: 945, comm: udevadm Not tainted 3.2.0-rc1-00252-g8f042aa #49
> Call Trace:
>  [<ffffffff81072795>] warn_slowpath_common+0x75/0xb0
>  [<ffffffff81072895>] warn_slowpath_null+0x15/0x20
>  [<ffffffff81167b26>] sysfs_get_inode+0x136/0x140
>  [<ffffffff811695df>] sysfs_lookup+0x6f/0x110
>  [<ffffffff8111b739>] d_alloc_and_lookup+0x39/0x80
>  [<ffffffff8111ca93>] do_lookup+0x283/0x390
>  [<ffffffff8111d954>] path_lookupat+0x114/0x6d0
>  [<ffffffff8111b946>] ? getname_flags+0x36/0x230
>  [<ffffffff8111df3b>] do_path_lookup+0x2b/0x70
>  [<ffffffff8111e3a8>] user_path_at_empty+0x58/0xb0
>  [<ffffffff81169d4c>] ? sysfs_put_link+0x1c/0x20
>  [<ffffffff81120ac4>] ? generic_readlink+0x84/0xa0
>  [<ffffffff8111e40c>] user_path_at+0xc/0x10
>  [<ffffffff811161e0>] vfs_fstatat+0x30/0x70
>  [<ffffffff8112d94b>] ? mntput_no_expire+0x2b/0xe0
>  [<ffffffff81116236>] vfs_stat+0x16/0x20
>  [<ffffffff81116305>] sys_newstat+0x15/0x30
>  [<ffffffff8111642e>] ? sys_readlinkat+0x7e/0xb0
>  [<ffffffff814d2c7b>] system_call_fastpath+0x16/0x1b
> ---[ end trace 2226f614d7765573 ]---
> Adding 2097148k swap on /var/tmp/swap/swapfile.  Priority:-1 extents:2 across:2634672k
> 
> fs/sysfs/sysfs.h:195: 
>     WARN_ON(!atomic_read(&sd->s_count));

Odd, is it reproducable?

Eric, any ideas?

thanks,

greg k-h
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