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To: Ryan Cutter <rcutter@ctgusa.com>
cc: questions@freebsd.org
Subject: Re: FreeBSD boot problem 
In-reply-to: Your message of "Wed, 10 Jul 1996 09:33:04 EDT."
             <1.5.4.32.19960710133304.008c5c24@ctgusa.com> 
From: David Greenman <davidg@root.com>
Reply-To: davidg@root.com
Date: Wed, 10 Jul 1996 07:05:05 -0700
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>        I've got a PC at home that is running Windows on one partion (@700
>Megs) and FreeBSD on the other (@400 Megs).  Just a few days ago, I
>installed Windows NT to take the place of Windows 3.1.  While I had 3.1,
>FreeBSD worked fine, but now with NT, it can't boot up.  When I try to boot
>BSD, the ususal script goes by, but about 20 seconds into it, I get the
>following error just after it says "Automatic Reboot in progress":
>
>             Fatal Trap 12:page fault while in kernel mode
>
>             fault virtual address           =0x24
>             fault code                      =supervisor read, page not present
>
>        There is some more info about the instruction pointer, code
>segement, etc..
>I've heard that BSD has trouble running when a 32-bit OS is in the DOS
>partition.  I've got 16 Megs of RAM, so I don't think it's a memory problem,
>but right now I'm lost.
>Any suggestions?

   Are you mounting msdosfs filesystems at startup? Don't...
   Have you perhaps updated your kernel sources but neglected to update the
kernel LKMs in /usr/src/lkm/* ?  An out of date filesystem LKM can cause
panics and/or serious filesystem damage if you don't have the code statically
compiled into the kernel.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project