On Mon, Oct 11, 2010 at 11:22:56AM -0700, Garrett D'Amore wrote:
> On Mon, 2010-10-11 at 11:18 -0700, Saadia Fatima wrote:
> > How can I catch a system panic/freeze. I tried booting up with a kernel
> > debugger, with -k option in the GRUB menu. When the system freezes how can
> > I switch to the debugger? I tried f1+shift+a but it did not work.
> >
> > Thanks
> > SF
>
>
> If your system freeze occurs at a level below the keyboard interrupt
> handler, then you're screwed. Some systems have a button or switch that
> can generate an NMI -- if you have one of those, then that can work for
> you. Otherwise, you're out of luck.
If the freeze impedes the system clock, you can enable the deadman timeout
by putting:
set snooping = 1
in /etc/system (and reboot). If the system freezes for 50 seconds, the
deadman timer will invoke panic(), which will start kmdb.
Cheers,
- jonathan
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