[Crash-utility] How do debug the kdump kernel using a Xen dump-core file?

[Olaf Hering]

On Thu, Feb 10, Dave Anderson wrote:

> 
> 
> ----- Original Message -----
> > Hello,
> > 
> > 'xm dump-core -L <domain>' generates a coredump of a Xen4 HVM guest, and
> > crash is able to poke around in this coredump.
> > Thanks for that.
> > 
> > But: How can I use crash to debug the crash/kdump kernel itself?
> > I did a 'echo c > /proc/sysrq-trigger' and want to look at the crash
> > kernel, not the normal kernel.
> > 
> > Olaf
> 
> There is no facility for kdump'ing the secondary "kdump" kernel.

'xm dump-core' can appearently create the required core file while the
kdump kernel runs. Just crash can appearently not "switch over".

What should I modify in crash to let it work from a different "offset",
in other words: the memory reserved for the kdump kernel?

Olaf