linux-kernel - Re: A reliable kernel panic (3.6.2) and system crash when visiting a particular website

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Date:	Sun, 21 Oct 2012 23:00:20 +0200
From:	Daniel Mack <zonque@...il.com>
To:	"Artem S. Tashkinov" <t.artem@...os.com>
CC:	bp@...en8.de, pavel@....cz, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, security@...nel.org,
	linux-media@...r.kernel.org, linux-usb@...r.kernel.org,
	alsa-devel@...a-project.org, stern@...land.harvard.edu
Subject: Re: A reliable kernel panic (3.6.2) and system crash when visiting
 a particular website

On 21.10.2012 22:43, Artem S. Tashkinov wrote:
>> Nice. Could you do that again with the patch applied I sent yo some
>> hours ago?
> 
> That patch was of no help - the system has crashed and I couldn't spot relevant
> messages.
> 
> I've no idea what it means.

The sequence of driver callbacks issued on a stream start is

 .open()
 .hw_params()
 .prepare()
 .trigger()

If the ALSA part really causes this issue, the bad things happen either
in any of the driver callback functions or in the core underneath.

The patch I sent returns an error from the hw_params callback, and as
you still see the problem, that means that the crash happens before any
of the USB audio streaming really starts.

Could you try and return -EINVAL from snd_usb_capture_open() please?

If anyone has a better idea on how to debug this, please chime in.


Daniel

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