Date: Fri, 23 Jan 1998 23:54:55 +1000 (EST) From: chaos@ultra.net.au To: lizard@freemail.gr Cc: freebsd-bugs@FreeBSD.ORG Subject: RE: bin/5549: Kernel Problem Message-ID: <XFMail.980123235455.chaos@ultra.net.au> In-Reply-To: <199801230247.SAA17820@hub.freebsd.org>
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On 23-Jan-98 lizard@freemail.gr wrote:
>
>>Number: 5549
>>Category: bin
>>Synopsis: Kernel Problem
>>Confidential: no
>>Severity: non-critical
>>Priority: medium
>>Responsible: freebsd-bugs
>>State: open
>>Quarter:
>>Keywords:
>>Date-Required:
>>Class: sw-bug
>>Submitter-Id: current-users
>>Arrival-Date: Thu Jan 22 18:50:01 PST 1998
>>Last-Modified:
>>Originator: Filargyropulos Stavros
>>Organization:
>>Release: 2.2.5
>>Environment:
>>Description:
>> My CPU is Cyrix
>
> The lines are:dosdev=80, biosdrive=0, unit=0, maj=0
> Booting 0: wd(0,a)/kernel @ 0x100000
> text=0x126000 data=0x12000 bss=0x16ae4
> symbols=[+0x51c+0x4+0x12bd0+0x4+018051]
> total=0x279c29 entry point = 0x100000
>
> Copyright (c) ...
> .....
> ....
> FreeBSD 2.2.5-RELEASE #0: Tue Oct 21 14:33:00 GMT 1997
> jkh@time.cdrom.com:/usr/src/sys/compile/GENERIC
> Fatal trap 1: privileged instruction fault while in kernel mode
> instruction pointer = 0x8:0xf01beb8a
> stack pointer = 0x10:0xefbfff38
> frame pointer = 0x10:0xefbfff50
> code segment = base 0x0 , limit 0xfffff , type 0x1b
> = DPL 0 , pres 1 , def32 1 , gran 1
> processor eflags = resume , IOPL=0
> current process = 0 ( )
> interrupt mask = net tty bio
> panic: privileged instruction fault
>
> ( AND THEN REBOOTS)
I also have this problem. I have also found a fix which I emailed to -hackers
about 2 months ago I'm still waiting for an offical patch. If you can get the
machine booted, go and edit/sys/i386/i386/identcpu.c and where
static int
identblue(void)
{
trap_by_wrmsr = 0;
/*
* Cyrix 486-class CPU does not support wrmsr instruction.
* The wrmsr instruction causes invalid opcode fault, and exception
line 566 add return 0;
so it reads
static int
identblue(void)
{
return 0;
trap_by_wrmsr = 0;
/*
* Cyrix 486-class CPU does not support wrmsr instruction.
* The wrmsr instruction causes invalid opcode fault, and exception
The problem is that the identblue() probe sets off a condition in the Cyrix
chip that causes frebsd to panic. The CPU I have that's causing the problem is
a Cyrix 686 P166+ MMX M2 chip.
Hope this helps.
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