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From: Tejun Heo <htejun@gmail.com>
To: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: gregkh@suse.de, maneesh@in.ibm.com, dmitry.torokhov@gmail.com,
	oneukum@suse.de, rpurdie@rpsys.net, James.Bottomley@SteelEye.com,
	stern@rowland.harvard.edu, linux-kernel@vger.kernel.org,
	akpm@linux-foundation.org
Subject: Re: [PATCH 12/14 UPDATED] sysfs: implement sysfs_dirent active reference and immediate disconnect
Date: Wed, 11 Apr 2007 18:26:42 +0900	[thread overview]
Message-ID: <461CA9D2.7020501@gmail.com> (raw)
In-Reply-To: <20070411110006.1007b209@gondolin.boeblingen.de.ibm.com>

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

  reply	other threads:[~2007-04-11  9:26 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-09  4:18 [PATCHSET #master] sysfs: make sysfs disconnect immediately on deletion, take 2 Tejun Heo
2007-04-09  4:18 ` [PATCH 04/14] sysfs: flatten cleanup paths in sysfs_add_link() and create_dir() Tejun Heo
2007-04-09  4:18 ` [PATCH 05/14] sysfs: consolidate sysfs_dirent creation functions Tejun Heo
2007-04-09  4:18 ` [PATCH 02/14] sysfs: fix error handling in binattr write() Tejun Heo
2007-04-09  4:18 ` [PATCH 03/14] sysfs: move release_sysfs_dirent() to dir.c Tejun Heo
2007-04-09  4:18 ` [PATCH 01/14] sysfs: fix i_ino handling in sysfs Tejun Heo
2007-04-27 15:29   ` Eric Sandeen
2007-04-27 15:32     ` Greg KH
2007-04-27 16:04       ` Eric Sandeen
2007-04-09  4:18 ` [PATCH 08/14] sysfs: make sysfs_dirent->s_element a union Tejun Heo
2007-04-09  4:18 ` [PATCH 09/14] sysfs: implement kobj_sysfs_assoc_lock Tejun Heo
2007-04-09  4:18 ` [PATCH 07/14] sysfs: add sysfs_dirent->s_name Tejun Heo
2007-04-09  4:18 ` [PATCH 11/14] sysfs: implement bin_buffer Tejun Heo
2007-04-09  4:18 ` [PATCH 06/14] sysfs: add sysfs_dirent->s_parent Tejun Heo
2007-04-09  4:18 ` [PATCH 10/14] sysfs: reimplement symlink using sysfs_dirent tree Tejun Heo
2007-04-09  4:18 ` [PATCH 14/14] sysfs: kill unnecessary attribute->owner Tejun Heo
2007-04-10 14:17   ` Cornelia Huck
2007-04-10 14:30     ` Cornelia Huck
2007-04-11  4:21       ` Tejun Heo
2007-04-11  4:25   ` [PATCH 14/14 UPDATED] " Tejun Heo
2007-04-09  4:18 ` [PATCH 12/14] sysfs: implement sysfs_dirent active reference and immediate disconnect Tejun Heo
2007-04-11  4:15   ` [PATCH 12/14 UPDATED] " Tejun Heo
2007-04-11  9:00     ` Cornelia Huck
2007-04-11  9:26       ` Tejun Heo [this message]
2007-04-11  9:32         ` Tejun Heo
2007-04-11 10:13         ` Tejun Heo
2007-04-11 10:26           ` Cornelia Huck
2007-04-12  7:18     ` Greg KH
2007-04-12  7:39       ` Greg KH
2007-04-09  4:18 ` [PATCH 13/14] sysfs: kill attribute file orphaning Tejun Heo
2007-04-10 14:44 ` [PATCHSET #master] sysfs: make sysfs disconnect immediately on deletion, take 2 Cornelia Huck
2007-04-11  4:18   ` Tejun Heo
2007-04-16  8:22 ` Maneesh Soni
2007-04-17  5:06   ` Tejun Heo
2007-04-17 12:42   ` Tejun Heo

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