From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Mack <zonque@gmail.com>
Subject: Re: [PATCH 2/5] ALSA: snd-usb: implement new endpoint
	streaming model
Date: Wed, 21 Dec 2011 18:18:30 +0100
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To: =?ISO-8859-1?Q?Aur=E9lien_Leblond?= <blablack@gmail.com>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, clemens@ladisch.de, gdiffey@gmail.com, linuxaudio@showlabor.de
List-Id: alsa-devel@alsa-project.org

On 12/21/2011 06:11 PM, Aur=E9lien Leblond wrote:
>>> In dmesg, I get the following:
>>> [   92.185624] BUG: unable to handle kernel NULL pointer dereference
>>> at 0000000000000008
>>> [   92.185637] IP: [<ffffffffa05c9768>]
>>> snd_usb_endpoint_activate+0x18/0x90 [snd_usb_audio]
>>
>> Can you do a quick fix and add the following two lines right at the
>> beginning of snd_usb_endpoint_activate() in sound/usb/endpoint.c:
>>
>>        if (!ep)
>>                return 0;
>>
>> ? I'll fix this in a nicer way, but that should work.
> =

> Code changed and compiled.
> Unfortunately my whole machine freezes as soon as I start Jack.

*sigh*

Which hardware is connected? Did you try that with both? Did you try
with anything else than jack? I'd need more information about your setup
to get an idea.

Daniel