linux-kernel - Re: kernel OOPS when releasing usb webcam (random)

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Message-ID: <alpine.DEB.2.00.1110181332320.2639@chino.kir.corp.google.com>
Date:	Tue, 18 Oct 2011 13:39:27 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Antonio Ospite <ospite@...denti.unina.it>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mauro Carvalho Chehab <mchehab@...radead.org>
cc:	"Tomas M." <tmezzadra@...il.com>, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: Re: kernel OOPS when releasing usb webcam (random)

On Tue, 18 Oct 2011, Antonio Ospite wrote:

> > > im getting the following null pointer dereference from time to time when
> > > releasing a usb camera.
> > > 
> > > maybe this trace is of assistance...please reply to my mail since im not
> > > subscribed.
> > > 
> > 
> > I suspect this is happening in v4l2_device_unregister_subdev().  Adding 
> > Guennadi, Mauro, and linux-media.
> > 
> > > BUG: unable to handle kernel NULL pointer dereference at 0000006c
> > > IP: [<f90be6c2>] v4l2_device_release+0xa2/0xf0 [videodev]
> 
> Hi,
> 
> I sent a fix for a similar trace last week:
> http://patchwork.linuxtv.org/patch/8124/
> 
> Tomas, can you test it fixes the problem for you too?
> 

Tomas reported that the same change from Frederik Deweerdt fixed the 
issue, so you can add his tested-by from 
https://lkml.org/lkml/2011/10/18/298.

Guennadi or Mauro, how is this going to Linus?  It sounds like 3.1 
material since we've received at least a couple of reports of this in the 
past week.
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