From owner-freebsd-bugs  Thu Oct 22 01:46:44 1998
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To: john gladkih <john@simcb.ru>
cc: freebsd-bugs@FreeBSD.ORG
Subject: Re: system hangs 
In-reply-to: Your message of "Thu, 22 Oct 1998 12:03:45 +0400."
             <199810220803.MAA14421@gate.simcb.ru> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Thu, 22 Oct 1998 01:47:33 -0700
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>I use SMP kernel with dual-CPU system (HP Vectra XU 6/200), 64M RAM.
>
>toor@gate[~]2:#> id
>uid=0(toor) gid=0(wheel) groups=0(wheel), 2(kmem), 3(sys), 4(tty), 5(operator), 20(staff) 31(guest)
>toor@gate[~]3:#> uname -a
>FreeBSD gate.simcb.ru 3.0-19980804-SNAP FreeBSD 3.0-19980804-SNAP #0: Sat Sep 19 08:23:32
>GMT 1998     john@gate.simcb.ru:/usr/src/sys/compile/PROXY-2CPU  i386
>toor@gate[~]4:#> dd if=/dev/mem of=/dev/null
                        ^^^^^^^^
>
>After 20 minutes later system was die. :-(

   Don't do that. It's not safe to read from /dev/mem like that since it will
touch device shared memory and other things.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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