linux-kernel - Re: 2.6.33-rc3 -- INFO: possible recursive locking -- (s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and

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Date:	Sat, 9 Jan 2010 16:10:49 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Miles Lane <miles.lane@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.33-rc3 -- INFO: possible recursive locking --
 (s_active){++++.+},  at: [<c10d2941>] sysfs_hash_and_remove+0x3d/0x4f

On Wed, 6 Jan 2010 07:54:59 -0500
Miles Lane <miles.lane@...il.com> wrote:

> [ 6967.926563] ACPI: Preparing to enter system sleep state S3
> [ 6967.956156] Disabling non-boot CPUs ...
> [ 6967.970401]
> [ 6967.970408] =============================================
> [ 6967.970419] [ INFO: possible recursive locking detected ]
> [ 6967.970431] 2.6.33-rc2-git6 #27


I get the same on changing cpufreq governor.....


[  165.356101] bash/1965 is trying to acquire lock:
[  165.356214]  (s_active){++++.+}, at: [<c04ea0a9>]
sysfs_hash_and_remove+0x3d/0x4f [  165.356257] 
[  165.356257] but task is already holding lock:
[  165.356257]  (s_active){++++.+}, at: [<c04eba15>]
sysfs_get_active_two+0x16/0x35 [  165.356257] 
[  165.356257] other info that might help us debug this:
[  165.356257] 4 locks held by bash/1965:
[  165.356257]  #0:  (&buffer->mutex){+.+.+.}, at: [<c04ea81f>]
sysfs_write_file+0x25/0xeb [  165.356257]  #1:  (s_active){++++.+}, at:
[<c04eba15>] sysfs_get_active_two+0x16/0x35 [  165.356257]  #2:
(s_active){++++.+}, at: [<c04eba20>] sysfs_get_active_two+0x21/0x35
[  165.356257]  #3:  (dbs_mutex){+.+.+.}, at: [<c066a2e2>]
cpufreq_governor_dbs+0x366/0x3fe [  165.356257] [  165.356257] stack
backtrace: [  165.356257] Pid: 1965, comm: bash Not tainted 2.6.33-rc3
#83 [  165.356257] Call Trace:
[  165.356257]  [<c07801d4>] ? printk+0xf/0x13
[  165.356257]  [<c04556ef>] __lock_acquire+0xc8a/0x13a7
[  165.356257]  [<c0454081>] ? mark_held_locks+0x43/0x5b
[  165.356257]  [<c04543de>] ? debug_check_no_locks_freed+0xfd/0x107
[  165.356257]  [<c0455e95>] lock_acquire+0x89/0xa2
[  165.356257]  [<c04ea0a9>] ? sysfs_hash_and_remove+0x3d/0x4f
[  165.356257]  [<c04eb7d4>] sysfs_addrm_finish+0x8f/0x100
[  165.356257]  [<c04ea0a9>] ? sysfs_hash_and_remove+0x3d/0x4f
[  165.356257]  [<c04ea0a9>] sysfs_hash_and_remove+0x3d/0x4f
[  165.356257]  [<c04ec5ae>] sysfs_remove_group+0x76/0xa5
[  165.356257]  [<c066a2f2>] cpufreq_governor_dbs+0x376/0x3fe
[  165.356257]  [<c0452a63>] ? trace_hardirqs_off+0xb/0xd
[  165.356257]  [<c044963c>] ? cpu_clock+0x2d/0x4e
[  165.356257]  [<c0452a85>] ? lock_release_holdtime+0x20/0x17a



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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