having trouble with kdb on smp (kernel 2.5.9)

[Matthew Dobson]

I should mention also, that kdb ALWAYS shows the same CPU: 1.  It never ends
up on 0, or 2-7.  I thought this was curious... is this some sort of default
behavior?  Or does this possibly help indicate the problem?

TIA,

-Matt

Keith Owens wrote:
> 
> On Wed, 15 May 2002 18:03:29 -0700,
> Patricia Gaughen <gone at us.ibm.com> wrote:
> >2.5.9 on an 8 proc numaq box.  I saw the recent patch from Ethan Solomita and
> >I'll give it a try tonight or tomorrow.  But we've ran into a couple of issues:
> >
> >       - when the system hangs we enter kdb but using bt, bta and btp do not produce
> >stacks for any of the processes.  We're able to get the stacks manually, but
> >this is not much fun :-)
> 
> Which version of gcc?  Newer versions of gcc produce stack frame code
> that kdb cannot backtrace without CONFIG_FRAME_POINTER=y.
> 
> >       - Also we're not able to switch cpus.
> 
> If the cpu command only displays one cpu then the others have been shut
> down.  By the time that kdb is called from the panic() routine, the
> panic code has already disabled all the other cpus.