RE: Debuggers for RT (was: Real-Time Preemption: Magic Sysrq p doesn't work)

[kus Kusche Klaus]

> * kus Kusche Klaus <kus@xxxxxxxx> wrote:
> 
> > I've been asked to analyze the various tools and possibilities 
> > available to debug an RT kernel.
> > 
> > * kgdb and kdb seem to be deeply incompatible with the RT 
> patches (they
> > mess with the scheduler, interrupts etc.), applying their 
> patches to an
> > RT tree fails quite impressively.
> 
> kgdb is in the -mm tree, and there are periodic ports to the 
> -mm tree. 
> Someone used it too on PREEMPT_RT - with some success. 
> There's no deep 
> incompatibility with the -RT kernel - just line-for-line collisions.
> 
> 	Ingo

Hmmm, kgdb is currently out of reach for me: The latest downloadable
kgdb tar archive is for 2.6.7, and I can't access the CVS repository
(our firewall only allows http:80 and ftp). Does anyone have a
downloadable current version?

I tried KDB with 2.6.12-rc2 and RT 7.45-01. It patches fine (except for
one trivial reject), compiles fine, boots fine, but freezes immediately
and completely when actually entering kdb. Power off is the only way
out...

-- 
Klaus Kusche                 (Software Development - Control Systems)
KEBA AG             Gewerbepark Urfahr, A-4041 Linz, Austria (Europe)
Tel: +43 / 732 / 7090-3120                 Fax: +43 / 732 / 7090-6301
E-Mail: kus@xxxxxxxx                                WWW: www.keba.com
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