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To: Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr>
cc: freebsd-current@FreeBSD.ORG
Subject: Re: Fatal trap 12: page fault while in kernel mode 
In-reply-to: Your message of "Sat, 10 May 1997 06:16:34 BST."
             <9705100516.AA10194@cabri.obs-besancon.fr> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Sat, 10 May 1997 00:02:16 -0700
Sender: owner-current@FreeBSD.ORG
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>My system sometimes crashes with this error message when I kill
>slattach . This problem appeared a little after the Lite-2 merge and
>is still present (kernel from 2 days ago):
>
>Fatal trap 12: page fault while in kernel mode
>fault virtual address  = 0x8ad90
>fault code             = supervisor read, page not present
>
>instruction pointer    = 0x8:0xf0149c34
>stack pointer          = 0x10:0xf4108d04
>frame pointer          = 0x10:0xf4108d3c
>code segment           = base 0x0, limit 0xfffff, type 0x1b
>                       = DPL 0, pres 1, def32 1, gran 1
>processor eflags       = interrupt enabled, resume, IOPL = 0
>current process                = 7872 (slattach)
>interrupt mask         = net tty 
>trap number            = 12
>panic: page fault
>
>Unfortunatly it does not create a dump. Here is the only info I can
>provide:
>
>f014b8e0 F slcompress.o
>f014b8e0 T _sl_compress_init
>f014b8e0 t ___gnu_compiled_c
>f014b8e0 t gcc2_compiled.
>f014b950 T _sl_compress_tcp
>f014be34 T _sl_uncompress_tcp
>f014beb0 T _sl_uncompress_tcp_core

   I don't know why you provided that; what we need is the stuff around
f0149xxx.

-DG

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