Re: nvidia kld panic with debug kernel

On Wednesday 21 September 2005 05:28 pm, Harald Schmalzbauer wrote:
> Am Mittwoch, 21. September 2005 22:51 CEST schrieb John Baldwin:
> > On Tuesday 20 September 2005 03:41 pm, Harald Schmalzbauer wrote:
> > > Hello,
> > >
> > > I get the following panic when using the nvidia driver with a debug
> > > kernel, when I disable INVARIANTS and WITNESS everything is working
> > > fine!
> > >
> > > Here's the trace:
> > >
> > > ACPI APIC Table: <D815EA EA81510A>
> > > ioapic0: Changing APIC ID to 1
> > > ioapic0 <Version 2.0> irqs 0-23 on motherboard
> > > panic: spin lock rm.mutex_mtx not in order list
> >
> > You need to add an entry for "rm.mutex_mtx" to the static spin lock
> > order list in sys/kern/subr_witness.c.  Something like this:
> >
> > Index: subr_witness.c
> > ===================================================================
> > RCS file: /usr/cvs/src/sys/kern/subr_witness.c,v
> > retrieving revision 1.201
> > diff -u -r1.201 subr_witness.c
> > --- subr_witness.c      15 Sep 2005 19:07:14 -0000      1.201
> > +++ subr_witness.c      21 Sep 2005 20:50:45 -0000
> > _at__at_ -363,6 +363,7 _at__at_
> >  #ifdef SMP
> >         { "ap boot", &lock_class_mtx_spin },
> >  #endif
> > +       { "rm.mutex_mtx", &lock_class_mtx_spin },
> >         { "sio", &lock_class_mtx_spin },
> >  #ifdef __i386__
> >         { "cy", &lock_class_mtx_spin },
>
> Thanks for your attention! I don't exactly know what this does and why I
> should add this spinlock exclude, I posted this error because somewhere
> between early BETA4 and late BETA4 I could run the nvidia driver with
> debug kernels without this panic. Short before BETA5 this changed back to
> the panic I've already seen before BETA4, so I posted it here.
> If it is something harmless it's safe to ignore my post, if it's something
> which reflects a bug I hope I could help.

It has to do with the WITNESS kernel option.  WITNESS has to be explicitly 
told about each spin mutex in the kernel.

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org