linux-kernel - Re: 2.6.20-rc2-mm1: INFO: possible recursive locking detected in con

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Date:	Fri, 5 Jan 2007 10:57:18 +0000
From:	Frederik Deweerdt <deweerdt@...e.fr>
To:	Greg KH <greg@...ah.com>
Cc:	Laurent Riffard <laurent.riffard@...e.fr>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Oliver Neukum <oliver@...kum.name>,
	Maneesh Soni <maneesh@...ibm.com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: 2.6.20-rc2-mm1: INFO: possible recursive locking detected in con_close

On Thu, Jan 04, 2007 at 05:10:05PM -0800, Greg KH wrote:
> On Fri, Dec 29, 2006 at 11:00:41AM +0000, Frederik Deweerdt wrote:
> > On Thu, Dec 28, 2006 at 10:25:12PM +0100, Laurent Riffard wrote:
> > > Le 28.12.2006 11:42, Andrew Morton a ?crit :
> > > >ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc2/2.6.20-rc2-mm1/
> > > 
> > > Hello,
> > > 
> > > got this with 2.6.20-rc2-mm1, reverting 
> > > gregkh-driver-driver-core-fix-race-in-sysfs-between-sysfs_remove_file-and-read-write.patch made it disappear.
> > > 
> > Hi, 
> > 
> > This is due to sysfs_hash_and_remove() holding dir->d_inode->i_mutex
> > before calling sysfs_drop_dentry() which calls orphan_all_buffers()
> > which in turn takes node->i_mutex.
> > The following patch solves the problem by defering the buffers orphaning
> > after the dir->d_inode->imutex is released. Not sure it's the best
> > solution though, Greg?
> > 
> > Regards,
> > Frederik
> > 
> > Signed-off-by: Frederik Deweerdt <frederik.deweerdt@...il.com>
> 
> Maneesh and Oliver, any objections to this patch?
> 
Actually, there's a problem with the patch: inode is not initialized in 
sysfs_hash_and_remove, I'll repost a patch against 2.6.20-rc3-mm1.

Regards,
Frederik
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