linux-kernel - Re: [v4l-dvb-maintainer] Re: oops in bttv

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Message-ID: <44BE699A.5000106@linuxtv.org>
Date:	Wed, 19 Jul 2006 13:19:22 -0400
From:	Michael Krufky <mkrufky@...uxtv.org>
To:	Nish Aravamudan <nish.aravamudan@...il.com>
CC:	Alex Riesen <raa.lkml@...il.com>, video4linux-list@...hat.com,
	Martin.vGagern@....net,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	v4l-dvb-maintainer@...uxtv.org,
	Alex Riesen <fork0@...rs.sourceforge.net>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [v4l-dvb-maintainer] Re: oops in bttv

Nish Aravamudan wrote:
> On 7/17/06, Alex Riesen <raa.lkml@...il.com> wrote:
>> On 7/15/06, Mauro Carvalho Chehab <mchehab@...radead.org> wrote:
>> > > What I did was to call settings of the flashplayer and press on the
>> > > webcam symbol there. The system didn't crash, just this oops:
>> > >
>> > > BUG: unable to handle kernel NULL pointer dereference at virtual
>> address 0000006
>> > > 5
>> > Hmm... Are you using it on what machine? It might be related to an
>> > improper handling at compat32 module.
>>
>> 32bit. PIV, 2Gb, highmem on.
> 
> Is this the same bug as http://bugzilla.kernel.org/show_bug.cgi?id=6869?

It LOOKS the same to me...  I have tried to reproduce this OOPS
unsuccessfully, but it seems to be happening for many other users.

I can't imagine why I am unable to reproduce it.

Hopefully Andrew will pull from Mauro's v4l-dvb.git for the new
changesets before he releases the next -mm...

The sanity checking cleanups have already been pushed up there:

http://www.kernel.org/git/?p=linux/kernel/git/mchehab/v4l-dvb.git;a=commitdiff;h=9c2f8a385c0bc40bf1f96edac32cc648d3a052fc;hp=0c445baf0daee379295adea8478278c0719e9c35

You might notice a tragic flaw in the previous code...
bttv_register_video was checking the return value on a void ...  Maybe
we'll get some better debug output after this patch gets out.

Cheers,

Michael Krufky

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