[linux-audio-user] jackd fails to start: cannot create shm segment /jack-shm-registry (No such file or directory)

[Ivica Bukvic]

Actually, Thac just released a new rpm of jackit (0.67.2) on his rpm
repository that magically fixes this issue. Yet, the CVS version simply
fails to work. Perhaps there is some bug in my CVS checkout, since it is
looking for /jack-shm-registry (which may imply it is looking for it in
the root dir? -- this would obviously be a bug).

Thanks for all your help!

Ico

> -----Original Message-----
> From: linux-audio-user-admin at music.columbia.edu
[mailto:linux-audio-user-
> admin at music.columbia.edu] On Behalf Of Jack O'Quin
> Sent: Friday, April 18, 2003 7:16 PM
> To: linux-audio-user at music.columbia.edu
> Cc: jackit-devel at lists.sourceforge.net
> Subject: Re: [linux-audio-user] jackd fails to start: cannot create
shm
> segment /jack-shm-registry (No such file or directory)
> 
> 
> This is beyond me.  Are you running devfs by any chance?
> 
> I'm copying this message to the jackit-devel list.  Maybe someone
> there knows what this problem is.
> 
> "Ivica Bukvic" <ico at fuse.net> writes:
> 
> > /dev/shm exists right after install, but there is no entry in the
> > /etc/fstab.
> >
> > The funny thing about the /dev/shm dir is that you cannot remove or
> > modify even as root. It's default creation date is Dec.31 1969 until
it
> > gets mounted, at which point it converts itself to the appropriate
date.
> >
> > I had to manually add the below included line to fstab:
> >
> > none /dev/shm tmpfs defaults 0 0
> >
> > and had to mount it manually in order for the jack's ./configure to
> > report that it has successfully found POSIX memory sharing. Yet, the
> > error persists when the newly compiled jackd is started:
> >
> > key for /tmp/jack/shm/jack-shm-registry is 0x6a0bdb99
> > cannot create shm segment /jack-shm-registry (No such file or
directory)
> > cannot create engine
> >
> > Should I simply revert to the older version of Jack until this stuff
is
> > sorted out?
> >
> > BTW, configure does revert to the other style of shared memory stuff
> > (System V shm) if it does not find POSIX one, but even if I compile
that
> > one, I still end up with the same error/results.
> >
> > Thanks for your help!
> >
> > Ico
> >
> >
> > > -----Original Message-----
> > > From: linux-audio-user-admin at music.columbia.edu
> > [mailto:linux-audio-user-
> > > admin at music.columbia.edu] On Behalf Of Jack O'Quin
> > > Sent: Friday, April 18, 2003 3:42 PM
> > > To: linux-audio-user at music.columbia.edu
> > > Subject: Re: [linux-audio-user] jackd fails to start: cannot
create
> > shm
> > > segment /jack-shm-registry (No such file or directory)
> > >
> > > "Ivica Bukvic" <ico at fuse.net> writes:
> > >
> > > > Hmm., I guess I was rejoicing prematurely...
> > > >
> > > > I added /dev/shm into fstab:
> > > >
> > > > none /dev/shm tmpfs defaults 0 0
> > > >
> > > > recompiled CVS jack (configure finds shm stuff ok)
> > > >
> > > > started jack and the same thingy happens:
> > > >
> > > > jackd -d alsa -d hw:0
> > > > jackd 0.68.0
> > > > Copyright 2001-2003 Paul Davis and others.
> > > > jackd comes with ABSOLUTELY NO WARRANTY
> > > > This is free software, and you are welcome to redistribute it
> > > > under certain conditions; see the file COPYING for details
> > > >
> > > > key for /tmp/jack/shm/jack-shm-registry is 0x6a0bdb99
> > > > cannot create shm segment /jack-shm-registry (No such file or
> > directory)
> > > > cannot create engine
> > > >
> > > > I guess I am back to square one.
> > > >
> > > > In addition, I forgot to mention one important issue with my
other
> > > > machine (where Jack works), and that is that it was updated from
> > mdk9.0,
> > > > while this one was a clean install. After two clean installs on
two
> > > > different machines, I noticed that neither had the shm entry in
> > fstab,
> > > > which obviously nullifies the possibility that it was a faulty
> > install
> > > > in the first place.
> > >
> > > Apparently, the POSIX shared memory implementation is not a
standard
> > > part of most Linux distributions.  That's a shame.
> > >
> > > > Again, any help is greatly appreciated! Sincerely,
> > >
> > > Does the directory /dev/shm exist?  If not, "mkdir /dev/shm" (as
> > root).
> > > Then mount /dev/shm, and try starting jackd again.
> > >
> > > What does "grep shm /etc/fstab" say?
> > >
> > > Sorry this is such a hassle.
> 
> --
>   Jack O'Quin
>   Austin, Texas, USA