linux-kernel - BUG: spinlock trylock failure on UP on CPU#0, vgchange/936

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Message-ID: <alpine.DEB.2.01.1201180009520.2895@trent.utfs.org>
Date:	Wed, 18 Jan 2012 00:18:24 -0800 (PST)
From:	Christian Kujau <lists@...dbynature.de>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	peterz@...radead.org, axboe@...nel.dk, dm-devel@...hat.com
Subject: BUG: spinlock trylock failure on UP on CPU#0, vgchange/936

Hi,

today's git checkout boots fine on powerpc32, but has this message during 
bootup:

BUG: spinlock trylock failure on UP on CPU#0, vgchange/936
 lock: ef32a9f8, .magic: dead4ead, .owner: vgchange/936, .owner_cpu: 0
Call Trace:
[eed459e0] [c0009de4] show_stack+0x70/0x1bc (unreliable)
[eed45a20] [c0326da8] spin_dump+0x70/0xe0
[eed45a30] [c0326f8c] do_raw_spin_trylock+0x58/0x70
[eed45a40] [c0512b28] _raw_spin_trylock+0x34/0xa0
[eed45a60] [c02f5510] put_io_context+0xd8/0x184
[eed45a80] [c0303428] __cfq_slice_expired+0x1e4/0x43c
[eed45ac0] [c03053d8] cfq_insert_request+0x264/0x5b0
[eed45ae0] [c02edef4] __elv_add_request+0x1a4/0x2d4
[eed45af0] [c02f1024] blk_flush_plug_list+0x22c/0x270
[eed45b20] [c05112dc] io_schedule+0x74/0xec
[eed45b30] [c0110f88] dio_await_completion+0x60/0xf4
[eed45b50] [c0112d0c] __blockdev_direct_IO+0x1b80/0x3574
[eed45d70] [c010f4a4] blkdev_direct_IO+0x54/0x64
[eed45d90] [c009a424] generic_file_aio_read+0x7b8/0x808
[eed45e40] [c00d4f68] do_sync_read+0xb8/0x144
[eed45ef0] [c00d6168] vfs_read+0xcc/0x1c0
[eed45f10] [c00d6394] sys_read+0x58/0xc8
[eed45f40] [c00127a0] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xfe52b90
    LR = 0x1003e834

The system is running fine so far and has before with 3.2.0-rc7, without 
that warning. The "vgchange" could be the result of some LVM2 initscripts 
(lvm2-2.02.66-5 are installed on this Debian/stable system), but there are 
no LVM disks anywhere on the system.

Full .config & dmesg: http://nerdbynature.de/bits/3.2.0/

Is this BUG something to worry about?

Thanks,
Christian.
-- 
BOFH excuse #100:

IRQ dropout
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