Jack/Natty crashes on "Cannot create thread 1 Operation not permitted" error

[Brian David]

On Sun, Dec 12, 2010 at 4:10 PM, Ronan Jouchet <ronan at jouchet.fr> wrote:
> Hi,
>
> I can't run Jack under Natty, it refuses to start and raises a "Cannot
> create thread 1 Operation not permitted" error. Full log at
> http://pastebin.com/B45WFr0F.
> Help welcome... maybe I just forgot something stupid, maybe this is a
> real issue.
>
> More info:
>   Realtime setup done at installed time
>   Realtime setup confirmed via the Ubustu Controls app (user in audio
> group, memlock, rtprio)
>   Kernels tested: generic, lowlatency
>   Tested under normal user account and with sudo
>   Gear: Edirol FA-66 through a TI PCMCIA card that used to work
> flawlessly under Lucid and Maverick.
>   Natty 20101212 x86
>
> Thanks for your help,
>
> --
> Ronan
>

One issue I see right away is that you should not be using Ubuntu
Studio Controls to adjust the realtime settings.  Unless things have
changed (perhaps they have), Ubuntu Studio Controls edits
/etc/security/limits.conf, which is the wrong file.  The file you will
want to edit is /etc/security/limits.d/audio.conf.  Because you've
used Ubuntu Studio Controls, there's a chance that you have settings
in both limits.conf and audio.conf, and this can definitely cause
issues.

Make sure only one of those files has the realtime settings.  Hope that helps!

-- 
-Brian David