Bug 30257

apm enabled kernel panic on FreeBSD 4.4-RC
I'm using very old machine called FMV-4100NL/T
I don't have manual so I don't know much about this machine.
this is error message and dmesg:
error:
Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x3a
falut code              = supervisor read, page not present
instruction pointer     = 0x8:0xc01c4934
stack pointer           = 0x10:0xc02e5d76
frame pointer           = 0x10:0xc02e5e16
code segment            = base rx0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (swapper)
interrupt mask          = net tty bio cam
trap number             = 12
panic: page fault
Uptime 0s
------
dmesg:
Copyright (c) 1992-2001 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 4.4-RC #0: Fri Aug 31 07:27:43 JST 2001
    root@route.my.domain:/usr/src/sys/compile/ROUTE.safe
Timecounter "i8254"  frequency 1193182 Hz
CPU: AMD Enhanced Am486DX4 Write-Through (486-class CPU)
  Origin = "AuthenticAMD"  Id = 0x484  Stepping = 4
  Features=0x1<FPU>
real memory  = 16777216 (16384K bytes)
avail memory = 13750272 (13428K bytes)
Preloaded elf kernel "kernel.safe" at 0xc02c8000.
npx0: <math processor> on motherboard
npx0: INT 16 interface
isa0: <ISA bus> on motherboard
orm0: <Option ROM> at iomem 0xc0000-0xc7fff on isa0
ata0 at port 0x1f0-0x1f7,0x3f6 irq 14 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model Generic PS/2 mouse, device ID 0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/15 bytes threshold
plip0: <PLIP network interface> on ppbus0
pca0 at port 0x40 on isa0
sbc0: <ESS ES1688> at port 0x220-0x22f,0x388-0x38b irq 5 drq 1 on isa0
pcm0: <ESS 18xx DSP> on sbc0
unknown: <PNP0501> can't assign resources
unknown: <PNP0510> can't assign resources
unknown: <PNP0401> can't assign resources
unknown: <PNP0600> can't assign resources
pca1: <AT-style speaker sound> at port 0x61 on isa0
unknown: <PNP0320> can't assign resources
unknown: <PNP0f13> can't assign resources
unknown: <PNP0931> can't assign resources
unknown: <PNP0e01> can't assign resources
unknown: <PNP0000> can't assign resources
ad0: 6194MB <HITACHI_DK228A-65> [13424/15/63] at ata0-master BIOSPIO
Mounting root from ufs:/dev/ad0s1a

How-To-Repeat: change kernel config file
 device apm0 at nexus? disable flags 0x20 
to
 device apm0 at nexus? flags 0x20
and build kernel and boot