[alsa-devel] [PATCH 2/5] ALSA: snd-usb: implement new endpoint streaming model

Daniel Mack zonque at gmail.com
Wed Dec 21 18:18:30 CET 2011

On 12/21/2011 06:11 PM, Aurélien 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.


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.


More information about the Alsa-devel mailing list