From owner-freebsd-questions  Mon Jul 28 08:03:29 1997
Return-Path: <owner-freebsd-questions>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id IAA11155
          for questions-outgoing; Mon, 28 Jul 1997 08:03:29 -0700 (PDT)
Received: from starfire.mn.org (root@starfire.skypoint.net [199.86.32.187])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id IAA11142
          for <questions@freebsd.org>; Mon, 28 Jul 1997 08:03:20 -0700 (PDT)
Received: (from john@localhost)
	by starfire.mn.org (8.8.5/1.1)  id KAA15417; Mon, 28 Jul 1997 10:02:34 -0500 (CDT)
Message-ID: <Mutt.19970728100234.john@dexter.starfire.mn.org>
Date: Mon, 28 Jul 1997 10:02:34 -0500
From: john@dexter.starfire.mn.org (John Lind)
To: questions@freebsd.org
Subject: "Fatal trap 12: page fault while in kernel mode" on one system
X-Mailer: Mutt 0.53
Mime-Version: 1.0
Sender: owner-freebsd-questions@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

I am administering about a dozen FreeBSD systems at various release
levels from 2.1.5 to 2.2.2.  One of these systems is rebooting at
random intervals (averaging about 1/day) without any apparent
relationship to load, task, or activity.  The system is:

FreeBSD 2.2.1-RELEASE #0: Fri Apr 11 12:59:46 CDT 1997
    root@minuet.starfire.mn.org:/usr/src/sys/compile/MINUET
CPU: Pentium (119.75-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x526  Stepping=6
  Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
real memory  = 67108864 (65536K bytes)

Like most of our systems, this one is using a 2940 Ultra PCI SCSI adapter
and an Intel EtherExpress Pro 10/100B PCI ethernet adapter.

The problem manifests as 

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0xfa75b36c
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xf01b1cba
stack pointer           = 0x10:0xefbfff18
frame pointer           = 0x10:0xefbfff28
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         = 5408 (atrun)
interrupt mask          = net bio
panic: page fault

This system was upgraded from 2.1.7 to 2.2.1.

Should I begin looking at hardware, or reload the poor thing from scratch
and see if that helps?

Thanks for any help and clues.

		 John Lind, Starfire Consulting Services
E-mail: john@starfire.MN.ORG	    USnail: PO Box 17247, Mpls MN  55417