obtaining a kernel crash dump

[Peter Pentchev]

On Wed, May 19, 2004 at 04:34:42PM +0300, Nick Strebkov wrote:
> Hi there.
> 
> I can't obtain a crash dump.
> 
> % cat /sys/i386/conf/DEVEL | grep makeoptions
> makeoptions     DEBUG=-g
> % cat /etc/rc.conf| grep dump
> dumpdev="/dev/ar0s1b"
> dumpdir="/var/crash"
> 
> I'm testing my kernel patch and the following is what I see in
> /var/log/messages:

Can you force the kernel to dump by using DDB?  Place 'options DDB' in
your kernel config, then, when the system is quiescent, hit Ctrl-Alt-Esc
and type 'panic' at the DDB prompt.

If this works, and you get a crash dump, then the problem might be that
with your kernel patch, the kernel is panicking in a low-level layer,
like memory management or disk drivers or something like that, and it
simply cannot make a crash dump, since that would mean invoking code
that depends on bad data or something.

G'luck,
Peter

-- 
Peter Pentchev	roam at ringlet.net    roam at sbnd.net    roam at FreeBSD.org
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Hey, out there - is it *you* reading me, or is it someone else?
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