linux-kernel - Re: [PATCH 2/2] sysfs: fix race condition around sd->s

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Message-ID: <4651C2B3.10905@redhat.com>
Date:	Mon, 21 May 2007 11:02:59 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	maneesh@...ibm.com
CC:	Tejun Heo <htejun@...il.com>, Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Clemens Schwaighofer <cs@...uila.co.jp>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Chuck Ebbert <cebbert@...hat.com>
Subject: Re: [PATCH 2/2] sysfs: fix race condition around sd->s_dentry, take#2

Maneesh Soni wrote:

> Looks ok to me.. I have tested it it but unfortunately I couldn't
> recreate the race without the patch also. It would be helpful if
> people actually seeing the race, provide the test results.
> 
> Greg, please merge this one once we have some test results.

I merged this back to RHEL4-era (2.6.9) kernels due to a report of this
problem on RHEL4.  The tester could hit the sysfs_d_iput bug fairly
easily before, and has not seen it with this patch in place.

The other bug they were seeing even more often was the sysfs_readdir()
oops as we try to extract the inode number for regular sysfs files,
again due to transient vnodes.  Is any fix for that problem being
considered for -stable?  I had backported a simpler version of Tejun's
s_ino fix for the problem, without the ida complexity - and brought a
couple other small upstream fixes back to support that.  If nothing has
yet been proposed for -stable, I can post that here.

Thanks,

-Eric
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