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Date: Sun, 13 Nov 2011 20:24:17 +0100
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Subject: WARNING: at fs/sysfs/sysfs.h:195 (during boot)
Message-ID: <20111113192417.GA1659@x4.trippels.de>
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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));

-- 
Markus