[linux-audio-user] [OT] Jack + muse = segmentation fault

R Parker rtp405 at yahoo.com
Wed Jul 9 15:34:01 EDT 2003

--- philippe <xaccrocheur at halluci.net> wrote:
> Jelmer wrote:
> >Hi folks,
> >
> >hope somebody can help me with getting muse running
> with Jack.
> >
> (...)
> Well, I was ready to help you with a big daddy tone,
> but this morning 
> Jack fails to start here too, and I cannot see what
> I done wrong. I'm 
> using 2.4.21-0.16mm-mdk on a Cel700&320RAM laptop,
> using a poor Intel810 
> card (for now)
> [root at satellite xix]# jackd -d alsa -d hw:0 (also
> tried jackd -R -d alsa 
> -d hw:0 -r 44100 -p 1024 -n 2 &)
> jackd 0.72.5
> (lisence stuff)
> JACK compiled with System V SHM support
> loading driver ..
> creating alsa driver ...
> hw:0|hw:0|1024|2|48000|nomon|swmeter|rt
> ALSA lib pcm_hw.c:866:(snd_pcm_hw_open) open
> /dev/snd/pcmC0D0p failed: 
> Device or resource busy

That's the hint. Try removing the jack temporary files
from the filesystem /tmp/jack

Perhaps you've got OSS or artsd or something else
using the device--just guessing.

> jackd: pcm.c:696: snd_pcm_nonblock: Assertion `pcm'
> failed.
> received signal 6 during shutdown (ignored)
> I'd like Jack to be launched at startup, like from
> /etc/rc.d/rc.local, 
> but 1st I have to fully understand what it does and
> how.
> #Can it be use as a standalone Audio daemon, like
> Arts or esd ?
> #In this case how to tell KDE to launch it ? Or
> better, can I start it 
> BEFORE and have KDE connect to it ?
> #Is it designed to be run as root only ? Yesterday I
> managed to launch 
> it as a user, and then still as a user, launch
> jack-rack that connected 
> to it. Fact is, that was pretty much paradise, I'd
> like to do it again ;)

This can be done by enabling capabilities in your
kernel. I believe simple instructions are available in
the jackd faq on the website. The instructions are
there somewhere. The capabilities will enable normal
users to run jackd with -R realtime priority. jackd is
designed for pro audio so it's very strict about
having clients perform on time and if they don't
they're kicked.

> # Is there a better place to ask those Qs ?

You could try the jack dev list but the developers are
pretty busy and might not reply.


> Thank you very much !
> pX
> PS - the last Moloko album "statues" rocks and damn
> -- 
> >--------------------
> http://www.halluci.net
> --------------------->

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