linux-kernel - Re: [PATCH] intel-agp.c: Fix crash when accessing nonexistent GTT entries in i915

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Message-ID: <20100321135836.GA11661@zhen-devel.sh.intel.com>
Date:	Sun, 21 Mar 2010 21:58:36 +0800
From:	Zhenyu Wang <zhenyuw@...ux.intel.com>
To:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, David.Woodhouse@...el.com,
	dwmw2@...radead.org, eric@...olt.net, ben@...adent.org.uk,
	gregkh@...e.de
Subject: Re: [PATCH] intel-agp.c: Fix crash when accessing nonexistent GTT
 entries in i915

On 2010.03.20 14:04:56 +0100, Miguel Ojeda wrote:
> On Fri, Mar 19, 2010 at 9:27 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Thu, 11 Mar 2010 16:54:26 +0100
> > Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:
> >
> >> Attached dmesg, lspci -vv, config and xorg.
> >>
> >> When the X server crashes, the kernel does not report anything
> >
> > This seems to have gone all quiet?
> 
> It seems so, I was about to ping Zhenyu.

Could you try recent X.org intel driver release? Your failure X log 
showed some pretty old UMS driver's render flush time out message, 
I think whose version never has been well tested with new kms/gem stuff.

> 
> >
> > As this was a 2.6.32->2.6.32.4 regression, I assume that it's also a
> > 2.6.32->2.6.33 regression?
> 
> Yep. All kernels I tested since 2.6.32.4 crash, including 2.6.32.10,
> 2.6.33 and 2.6.34-rc1. See my original message for more details about
> the crash.
> 

Could you bisect? I doubt it's caused by David's patch, as if it is, you
will have trouble at early agp init time, instead of current problem looks
like something causing rendering hang..and I can't think of how mapping GTT
to a scratch page could cause problem in case GTT bar is truely 256K.

-- 
Open Source Technology Center, Intel ltd.

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