linux-kernel - Re: linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk

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Date:	Thu, 13 Jan 2011 01:23:45 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Valdis.Kletnieks@...edu
CC:	Alexander Viro <viro@...iv.linux.org.uk>,
	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk_holder+0x92/0x1ac()

On 01/12/2011 06:34 PM, Valdis.Kletnieks@...edu wrote:
> Seen in a boot of yesterday's linux-next.   The 'W' flag was due to the
> already-reported 'WARNING: at kernel/workqueue.c:1202 worker_enter_idle'.
> Not sure if it's a block_dev or dm/LVM issue, so I'm cc:'ing both groups.  I wonder
> if the fact I still have 'CONFIG_DEVTMPFS=n' is involved (it's apparently ticking off
> dracut before and after the warning).
> 
> [   16.840333] dracut: Found volume group "vg_blackice" using metadata type lvm2
> [   16.892282] dracut: The link /dev/vg_blackice/opt should had been created by udev but it was not found.  Falling back to direct link creation.
> [   16.912627] ------------[ cut here ]------------
> [   16.912635] WARNING: at fs/block_dev.c:824 bd_link_disk_holder+0x92/0x1ac()

That seems to be
WARN_ON_ONCE(!bdev->bd_holder || bdev->bd_holder_disk);
added in patch
http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commitdiff;h=e09b457bdb7e8d23fc54dcef0930ac697d8de895
"block: simplify holder symlink handling"

dm linear just claims device in table constructor, I don't think it is bug in DM code.

> [   16.912638] Hardware name: Latitude E6500
> [   16.912640] Modules linked in:
> [   16.912644] Pid: 1920, comm: lvm Tainted: G        W   2.6.37-next-20110111 #1
> [   16.912647] Call Trace:
> [   16.912653]  [<ffffffff8103a989>] ? warn_slowpath_common+0x80/0x98
> [   16.912657]  [<ffffffff8103a9b6>] ? warn_slowpath_null+0x15/0x17
> [   16.912660]  [<ffffffff8111fb03>] ? bd_link_disk_holder+0x92/0x1ac
> [   16.912665]  [<ffffffff8139b875>] ? open_dev+0x76/0x9e
> [   16.912668]  [<ffffffff8139bc9d>] ? dm_get_device+0x147/0x1dc
> [   16.912672]  [<ffffffff8139d088>] ? linear_ctr+0x98/0xd4
> [   16.912676]  [<ffffffff8139c289>] ? dm_table_add_target+0x149/0x1d4
> [   16.912679]  [<ffffffff8139e57c>] ? table_load+0xf0/0x27b
> [   16.912683]  [<ffffffff8139e48c>] ? table_load+0x0/0x27b
> [   16.912686]  [<ffffffff8139f326>] ? ctl_ioctl+0x1c6/0x21e
> [   16.912690]  [<ffffffff8139f38c>] ? dm_ctl_ioctl+0xe/0x12
> [   16.912695]  [<ffffffff8110258e>] ? do_vfs_ioctl+0x4c4/0x505
> [   16.912699]  [<ffffffff81102626>] ? sys_ioctl+0x57/0x95
> [   16.912703]  [<ffffffff8100253b>] ? system_call_fastpath+0x16/0x1b
> [   16.912706] ---[ end trace 4eaa2a86a8e2da24 ]---
> [   16.925289] dracut: The link /dev/vg_blackice/src should had been created by udev but it was not found.  Falling back to direct link creation.
> 

Milan
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