Re: kgdb on kernel 2.6.14

On Monday 16 Jan 2006 1:57 pm, elise guedin wrote:
> Hi,
>
> I am trying to use kgdb to debug one of our custom kernel module.
>
> I am using standard kernel 2.6.14 and kgdb-2-2.6.14. Development and
> target machines are dual processors machines (DELL 2450). I attach the
> config file of the target machine.
> (I am not using kgdbwait in grub because in this case, I get an error E22)
>
> I can sometimes connect remotely to the target machine via gdb (using
> target remote /dev/ttyS0) and debug but sometimes it does not work
> I think it is related to the messages I get :
>
> - NMI received for unknown reason 21 on CPU 0
> Dazed and confused, but trying to continue
> Do you have a strange power saving mode enabled?

Interesting. Could you send the kernel messages (dmesg output) 
and /proc/interrupts? This machine is most probably routing NMIs in an 
unusual way.

KGDB is dependent on NMIs working correctly. Try appending "nmi_watchdog=1" on 
kernel command line.
-Amit

>
> - Not all CPUs have been synced for KGDB
>
> I would be grateful for any advice
> Thanks
> Regards
>
> Elise


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