amd64/68083: AMD64 Current 20040324 snapshot iso panics on install

[Joe Talbott]

>Number:         68083
>Category:       amd64
>Synopsis:       AMD64 Current 20040324 snapshot iso panics on install
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jun 18 15:30:25 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Joe Talbott
>Release:        FreeBSD 5-CURRENT (snapshot 20040324) amd64
>Organization:
none
>Environment:
	Epox 8hda3+, Amd 64 3200+, 512MB Kingston RAM, FreeBSD 5-CURRENT
	(snapshot 20040324) amd64

	VIA K8T800 + VT8237 Chipset
	
>Description:
	Kernel trap 9: general protection fault while in kernel mode
	when booting FreeBSD 5-CURRENT (snapshot 20040324) amd64 just after
	cdrom drive probe.  This happens every time I boot from this cd 
	(I burned several copies on different machines and checked md5 
	checksum) When booting 5.2.1-RELEASE (amd64) the system hangs at
	this points and keyboard input (Ctrl-Alt-Del) has no effect. I can 
	boot 5.2.1-RELEASE i386, 4.9-RELEASE, and DragonFlyBSD 1.0-CURRENT
	and have done numerous buildworlds as a rudementary test of hardware
	with no problems.  This happens with ACPI disabled as well.

[THIS IS HAND TRANSCRIBED]

acd0: CDROM <CREATIVE CD5230E> at ata1-slave PIO4
Kernel trap 9 with interrupts disabled

Fatal trap 9: general protection fault while in Kernel mode
cpuid = 0; apic id = 00
intruction pointer			= 0x8:0xffffffff804b1cc4
stack pointer						= 0x10:0xffffffff98147bb0
frame pointer						= 0x10:0xffffffff98147bc0
code segment						= base 0x0, limit 0xfffff, type 0x1b
												= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags				= resume, IOPL = 0
current process					= 9 (pagezero)
kernel: type 9 trap, code = 0
Stopped at 	vm_pageq_remove_nowakeup+0x2c: decl %eax
db> trace
vm_pageq_remove_nowakeup() at vm_pageq_remove_nowakeup+0x2c
vm_page_zero_idle() at vm_page_zero_idle+0x88
vm_pagezero() at vm_pagezero+0xad
fork_exit() at fork_exit+0x9f
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffff98147d00, rbp = 0 ---
db>

>How-To-Repeat:
	boot with 5-CURRENT (snapshot 20040324) cd 
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: