[PlanetCCRMA] redhat trouble with grub

Tue Oct 5 15:21:01 2004

On Tue, 2004-10-05 at 14:59, Noah Garrett Wallach wrote:
> > > > 
> > > > Have you tried to non-redhat Planet CCRMA kernel? (based currently on
> > > > 2.4.26).
> > >
> > > okay I will try that.  can you please tell me how I find the sources for the
> > > 2.4.26 kernel and point me to a tutorial on how to build from the sources and
> > > incoporate the capabilities patch.
> > 
> > Well, you don't need to rebuild from source, a low latency version of
> > 
> > 2.4.26 is available from Planet CCRMA. You just need to install it with
> > "apt-get install planetccrma-core" or "planetccrma-core-smp" for an smp
> > kernel.
>
> Okay I retrieved and installed the 2.4.26 kernel with apt-get.  I boot up with
> both the SMP (which is proper) and non-SMP kernel.
> 
> under each scenario - GNOME environment fails which the following appearing in
> the .xsession-errors
> 
> --- snip ---
> 
> $ cat .xsession-errors.backup
>  
> GThread-ERROR **: file gthread-posix.c: line 135 (): error 'No such process'
> during 'pthread_getschedparam (pthread_self(), &policy, &sched)'
> aborting...
> [noah@dhcp-183-1-168-192 noah]$ date
> Tue Oct  5 14:55:00 PDT 2004
> [noah@dhcp-183-1-168-192 noah]$
> 
> --- snip ---
> 
> and when I switch to KDE environment I am unable to run applications like
> xterm and mozilla.  so this kernel does not appear to be working well for me.
> 
> any other clues?  

This reminds me of an old bug in a RedHat 9 version of glibc that would
improperly recognize whether the kernel supported nptl (the new
threading model). The 2.4.26 Planet CCRMA low latency kernel does not
support nptl because the nptl patch is big and conflicts with the low
latency patches. If glibc misinterprets the kernel threading model (as
it is probably the case here) then heavily threaded apps like mozilla do
not run, but others that do not rely on threads work fine. 

If this is the case then upgrading glibc to a version that does not have
the bug is the only way out. 

-- Fernando