linux-kernel - Re: NULL pointer dereference at cfq_exit_single_io

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Message-ID: <20091004193111.1e8e3baf@daedalus.pq.iki.fi>
Date:	Sun, 4 Oct 2009 19:31:11 +0300
From:	Pekka Paalanen <pq@....fi>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	jens.axboe@...cle.com, dri-devel@...ts.sf.net
Subject: Re: NULL pointer dereference at cfq_exit_single_io_context

On Sun, 04 Oct 2009 11:12:55 +0300
Ozan Çağlayan <ozan@...dus.org.tr> wrote:

> Hi,
> 
> The attached dmesg is obtained on a 2.6.30.8 with:
> 
> - DRM patches mainly gathered from Fedora F-11 branch,
> - The following patch from mainline which addresses kernel
> bugzilla #13401:
> 
> From: Jeff Moyer <jmoyer@...hat.com>
> Date: Fri, 11 Sep 2009 15:08:59 +0000 (+0200)
> Subject: cfq: choose a new next_req when a request is dispatched
> X-Git-Url:
> http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=06d2188644c85c56d243efab914f368d1d23c4a3
> 
> 
> The user which sent me the dmesg below tells that consecutive
> attempts to boot into X with the *nouveau* driver is generally
> not possible because of random lockups.
> 
> I'll have access to the machine in this week so I can try
> anything you want me to do.

This problem should be fixed now, we debugged it for a long time. E.g.
https://bugs.freedesktop.org/show_bug.cgi?id=23847

The commit:
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=7798546495c04a810db86be34ba1f39e370fd325
"drm/nouveau: fix missized allocation for ttm_bo_global struct"

I hope that solves your issue.

-- 
Pekka Paalanen
http://www.iki.fi/pq/
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