linux-kernel - Re: [PATCH 12/14 UPDATED] sysfs: implement sysfs_dirent active reference and immediate disconnect

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Message-ID: <461CAB48.8010801@gmail.com>
Date:	Wed, 11 Apr 2007 18:32:56 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
CC:	gregkh@...e.de, maneesh@...ibm.com, dmitry.torokhov@...il.com,
	oneukum@...e.de, rpurdie@...ys.net, James.Bottomley@...elEye.com,
	stern@...land.harvard.edu, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 12/14 UPDATED] sysfs: implement sysfs_dirent active reference
 and immediate disconnect

Tejun Heo wrote:
> Hello,
> 
> Cornelia Huck wrote:
>> =======================================================
>> [ INFO: possible circular locking dependency detected ]
>> 2.6.21-rc6-ge666c753-dirty #54
>> -------------------------------------------------------
>> kslowcrw/64 is trying to acquire lock:
>>  (&sch->reg_mutex){--..}, at: [<00000000004233b2>] mutex_lock+0x3e/0x4c
>>
>> but task is already holding lock:
>>  (&sd->s_active){----}, at: [<0000000000209578>] remove_dir+0xec/0x144
>>
>> which lock already depends on the new lock.
> 
> This is probably because s_active has different write locked and
> unlocked by different threads but it doesn't tell lockdep about it.

s/has different/is/

Sorry.

-- 
tejun
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