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Date: Tue, 10 Feb 1998 17:17:31 -0800 (PST)
From: wall@montana.avicom.net
To: freebsd-gnats-submit@FreeBSD.ORG
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Subject: kern/5709: Fatal trap 12: page fault in kernel mode while trying to boot to install
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>Number:         5709
>Category:       kern
>Synopsis:       Fatal trap 12: page fault in kernel mode while trying to boot to install
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 10 17:20:01 PST 1998
>Last-Modified:
>Originator:     Bob Wall
>Organization:
>Release:        2.2.5  (also occurred in 2.2.2)
>Environment:
Can't get the machine to boot to print the environment.  It's a Micron
XPE laptop with docking station (contains an AMD 53C974 SCSI controller
and integrated AMD Ethernet adapter), 64M RAM, 2.1 G IDE hard drive.
>Description:
I'm trying to install FreeBSD 2.2.5 - I created a boot floppy, and when
I try to boot from it, I get the following (whether I skip the kernel
config or not):

avail memory = 61071360 (59640K bytes0
Probing for devices on PCI bus 0:
chip0 <Intel 82437MX mobile PCI cache memory controller> rev 2 on pci0:0
chip1 <Intel 82371MX mobile PCI I/O IDE accelerator (MPIIX)> rev 3 on pci0:1
amd0 <amd 53c974 scsi> rev 2 int a irq 15 on pci0:17

amd0 waiting for devices to settle

Fatal trap 12: page fault while in kernel mode
fault virtual address     = 0x18
fault code                = supervisor read, page not present
instruction pointer       = 0x8:0xf017e09b
stack pointer             = 0x10:0xefbffd54
frame pointer             = 0x10:0xefbffd6c
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           = 0 ()
interrupt mask            = net tty bio
panic: page fault


Under version 2.2.2, it wouldn't do this if the laptop was not in the
docking station (so I suspect it is the amd0 driver causing the
problem).  I haven't tried it with 2.2.5 yet.
>How-To-Repeat:
Try to boot using the boot floppy.
>Fix:

>Audit-Trail:
>Unformatted:

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