linux-kernel - Re: inode->i_wb

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Message-ID: <20120309151951.GA30160@redhat.com>
Date:	Fri, 9 Mar 2012 10:19:51 -0500
From:	Dave Jones <davej@...hat.com>
To:	Yang Bai <hamo.by@...il.com>, Jan Kara <jack@...e.cz>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Fedora Kernel Team <kernel-team@...oraproject.org>,
	viro@...iv.linux.org.uk, Christoph Hellwig <hch@...radead.org>
Subject: Re: inode->i_wb_list corruption.

On Fri, Mar 09, 2012 at 09:57:14AM -0500, Dave Jones wrote:
 > On Fri, Mar 09, 2012 at 04:34:57PM +0800, Yang Bai wrote:
 >  
 >  > I still want to know how to reproduce this bug. I add the following
 >  > patch to the kernel fc-16 3.2.9-1
 >  > 
 >  > So on every inode_wb_list_del, it will show the whole list.
 >  > 
 >  > and Doing while true; do touch a && rm -f a; done for almost one day
 >  > without any problem.
 >  > 
 >  > So How to reproduce it??
 > 
 > If it was that easy, I'd be bisecting it by now ;-)
 > 
 > This, like a bunch of other really weird bugs that we have no explanation for,
 > only seems to be being hit by a small minority of users.
 > 
 > One common thing seems to be that they were all quad core intel
 > boxes, with i915 graphics.
 > 
 > We have some reports of i915 causing memory corruption after suspend/hibernate,
 > but none of these reports mention whether they've done that (I just asked).

And with that, this arrived.. 
https://bugzilla.redhat.com/show_bug.cgi?id=788433#c3

I'm leaning strongly towards believing this is yet another case of i915
corrupting memory on resume.

	Dave

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