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

Ronan Jouchet ronan at jouchet.fr
Mon Dec 13 02:05:00 GMT 2010

On 10-12-12 08:41 PM, Brian David wrote:
> 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!

Hi Brian,

Indeed, both files exist and have different settings, I'm having a look 
at this.

Also, adi from #ffado mentioned several points nedding investigation, 
I'll test them tomorrow and report here.

Thanks for the hint!

Ronan Jouchet

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