Stop scheduler on panic

[Fabian Keil]

Kostik Belousov <kostikbel at gmail.com> wrote:

> I was tricked into finishing the work by Andrey Gapon, who developed
> the patch to reliably stop other processors on panic.  The patch
> greatly improves the chances of getting dump on panic on SMP host.

I tested the patch trying to get a dump (from the debugger) for
kern/162036, which currently results in the double fault reported in:
http://lists.freebsd.org/pipermail/freebsd-current/2011-September/027766.html

It didn't help, but also didn't make anything worse.

Fabian
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