misc/90287: kernel panic on startx command

[_beastie_]

>Number:         90287
>Category:       misc
>Synopsis:       kernel panic on startx command
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 12 16:30:11 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     _beastie_
>Release:        FreeBSD 6.0-RELEASE
>Organization:
homenet.az
>Environment:
FreeBSD neverland.homenet.az 6.0-RELEASE FreeBSD 6.0-RELEASE #1: Sat Dec 10 12:38:33 AZT 2005
root at neverland.homenet.az:/usr/obj/usr/src/sys/CUSTOM  i386              
>Description:
kernel panic, memory dump and reboot when trying to start X server
backtrace of the panic:

Unread portion of the kernel message buffer:
drm0: <SiS 630> port 0xa800-0xa87f mem 0xf0000000-0xf7ffffff,0xe9800000-0xe981ffff irq 11 at device 0.0 on pci1
info: [drm] AGP at 0xec000000 64MB
info: [drm] Initialized sis 1.1.0 20030826 on minor 0
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x74
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc04fd175
stack pointer           = 0x28:0xcf701a5c
frame pointer           = 0x28:0xcf701a60
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 3
current process         = 501 (Xorg)
trap number             = 12
panic: page fault
Uptime: 41s
Dumping 223 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 223MB (57084 pages) 208 192 176 160 144 128 112 96 80 64 48 32 16

#0  doadump () at pcpu.h:165
165             __asm __volatile("movl %%fs:0,%0" : "=r" (td));

>How-To-Repeat:
try to start X server 
>Fix:
don't know how to fix
>Release-Note:
>Audit-Trail:
>Unformatted: