linux-kernel - Re: 2.6.18-mm2

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Date:	Thu, 28 Sep 2006 13:54:07 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Andrew Morton" <akpm@...l.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Neil Brown" <neilb@....unsw.edu.au>, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.18-mm2

Hi,

On 28/09/06, Andrew Morton <akpm@...l.org> wrote:
>
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18/2.6.18-mm2/
>
>

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.18-mm2 #1
-------------------------------------------------------
nash/1264 is trying to acquire lock:
 (&bdev_part_lock_key){--..}, at: [<c0310d4a>] mutex_lock+0x1c/0x1f

but task is already holding lock:
 (&new->reconfig_mutex){--..}, at: [<c03108ff>]
mutex_lock_interruptible+0x1c/0x1f

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&new->reconfig_mutex){--..}:
       [<c01390b8>] add_lock_to_list+0x5c/0x7a
       [<c013b1dd>] __lock_acquire+0x9f3/0xaef
       [<c013b643>] lock_acquire+0x71/0x91
       [<c031068f>] __mutex_lock_interruptible_slowpath+0xd2/0x326
       [<c03108ff>] mutex_lock_interruptible+0x1c/0x1f
       [<c02ba4e3>] md_open+0x28/0x5d
       [<c0197853>] do_open+0x8b/0x377
       [<c0197cd5>] blkdev_open+0x1d/0x46
       [<c0172f36>] __dentry_open+0x133/0x260
       [<c01730d1>] nameidata_to_filp+0x1c/0x2e
       [<c0173111>] do_filp_open+0x2e/0x35
       [<c0173170>] do_sys_open+0x58/0xde
       [<c0173222>] sys_open+0x16/0x18
       [<c0103297>] syscall_call+0x7/0xb
       [<ffffffff>] 0xffffffff

-> #1 (&bdev->bd_mutex){--..}:
       [<c01390b8>] add_lock_to_list+0x5c/0x7a
       [<c013b1dd>] __lock_acquire+0x9f3/0xaef
       [<c013b643>] lock_acquire+0x71/0x91
       [<c0310b0f>] __mutex_lock_slowpath+0xd2/0x2f1
       [<c0310d4a>] mutex_lock+0x1c/0x1f
       [<c0197824>] do_open+0x5c/0x377
       [<c0197bab>] blkdev_get+0x6c/0x77
       [<c01978d0>] do_open+0x108/0x377
       [<c0197bab>] blkdev_get+0x6c/0x77
       [<c0197eb1>] open_by_devnum+0x30/0x3c
       [<c0147419>] swsusp_check+0x14/0xc5
       [<c0145865>] software_resume+0x7e/0x100
       [<c010049e>] init+0x121/0x29f
       [<c0103f23>] kernel_thread_helper+0x7/0x10
       [<c0109523>] save_stack_trace+0x17/0x30
       [<c0138fb0>] save_trace+0x4f/0xfb
       [<c01390b8>] add_lock_to_list+0x5c/0x7a
       [<c013b1dd>] __lock_acquire+0x9f3/0xaef
       [<c013b643>] lock_acquire+0x71/0x91
       [<c0310b0f>] __mutex_lock_slowpath+0xd2/0x2f1
       [<c0310d4a>] mutex_lock+0x1c/0x1f
       [<c0197824>] do_open+0x5c/0x377
       [<c0197bab>] blkdev_get+0x6c/0x77
       [<c01978d0>] do_open+0x108/0x377
       [<c0197bab>] blkdev_get+0x6c/0x77
       [<c0197eb1>] open_by_devnum+0x30/0x3c
       [<c0147419>] swsusp_check+0x14/0xc5
       [<c0145865>] software_resume+0x7e/0x100
       [<c010049e>] init+0x121/0x29f
       [<c0103f23>] kernel_thread_helper+0x7/0x10
       [<ffffffff>] 0xffffffff

-> #0 (&bdev_part_lock_key){--..}:
       [<c013a7b6>] print_circular_bug_tail+0x30/0x64
       [<c013b114>] __lock_acquire+0x92a/0xaef
       [<c013b643>] lock_acquire+0x71/0x91
       [<c0310b0f>] __mutex_lock_slowpath+0xd2/0x2f1
       [<c0310d4a>] mutex_lock+0x1c/0x1f
       [<c0197323>] bd_claim_by_disk+0x5f/0x18e
       [<c02b44ec>] bind_rdev_to_array+0x1f0/0x20e
       [<c02b6453>] autostart_arrays+0x24b/0x322
       [<c02b9158>] md_ioctl+0x91/0x13f4
       [<c01ea5bc>] blkdev_driver_ioctl+0x49/0x5b
       [<c01ead23>] blkdev_ioctl+0x755/0x7a2
       [<c0196f9d>] block_ioctl+0x16/0x1b
       [<c01801d2>] do_ioctl+0x22/0x67
       [<c0180460>] vfs_ioctl+0x249/0x25c
       [<c01804ba>] sys_ioctl+0x47/0x75
       [<c0103297>] syscall_call+0x7/0xb
       [<ffffffff>] 0xffffffff

other info that might help us debug this:

1 lock held by nash/1264:
 #0:  (&new->reconfig_mutex){--..}, at: [<c03108ff>]
mutex_lock_interruptible+0x1c/0x1f
stack backtrace:
 [<c0104215>] dump_trace+0x64/0x1cd
 [<c0104390>] show_trace_log_lvl+0x12/0x25
 [<c01049e5>] show_trace+0xd/0x10
 [<c0104aad>] dump_stack+0x19/0x1b
 [<c013a7df>] print_circular_bug_tail+0x59/0x64
 [<c013b114>] __lock_acquire+0x92a/0xaef
 [<c013b643>] lock_acquire+0x71/0x91
 [<c0310b0f>] __mutex_lock_slowpath+0xd2/0x2f1
 [<c0310d4a>] mutex_lock+0x1c/0x1f
 [<c0197323>] bd_claim_by_disk+0x5f/0x18e
 [<c02b44ec>] bind_rdev_to_array+0x1f0/0x20e
 [<c02b6453>] autostart_arrays+0x24b/0x322
 [<c02b9158>] md_ioctl+0x91/0x13f4
 [<c01ea5bc>] blkdev_driver_ioctl+0x49/0x5b
 [<c01ead23>] blkdev_ioctl+0x755/0x7a2
 [<c0196f9d>] block_ioctl+0x16/0x1b
 [<c01801d2>] do_ioctl+0x22/0x67
 [<c0180460>] vfs_ioctl+0x249/0x25c
 [<c01804ba>] sys_ioctl+0x47/0x75
 [<c0103297>] syscall_call+0x7/0xb
DWARF2 unwinder stuck at syscall_call+0x7/0xb

Leftover inexact backtrace:

 =======================
md: bind<hdb2>

config & dmesg http://www.stardust.webpages.pl/files/mm/2.6.18-mm2/

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/)
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