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

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Message-ID: <461CA9D2.7020501@gmail.com>
Date:	Wed, 11 Apr 2007 18:26:42 +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

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.
I'll read lockdep docs and update it.

Thanks for testing.

-- 
tejun
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