panic in rman_reserve_resource_bound

With today's -CURRENT:

Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...               
/boot/kernel/acpi.ko text=0x3abd4 data=0x16f8+0xe68 syms=[0x4+0x5c10+0x4+0x7a31]
Copyright (c) 1992-2003 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 5.1-CURRENT #0: Sun Oct  5 16:11:39 BST 2003
    bms_at_kimchi.dek.spc.org:/usr/home/bms/cvs/src/sys/i386/compile/KIMCHI_DEBUG
Preloaded elf kernel "/boot/kernel/kernel" at 0xc082a000.
Preloaded elf module "/boot/kernel/vesa.ko" at 0xc082a1cc.
Preloaded elf module "/boot/kernel/if_vr.ko" at 0xc082a278.
Preloaded elf module "/boot/kernel/usb.ko" at 0xc082a324.
Preloaded elf module "/boot/kernel/netgraph.ko" at 0xc082a3cc.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc082a47c.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) processor (1435.75-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x642  Stepping = 2
  Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
  AMD Features=0xc0440000<RSVD,AMIE,DSP,3DNow!>
real memory  = 268369920 (255 MB)
avail memory = 251154432 (239 MB)
Pentium Pro MTRR support enabled
VESA: v3.0, 4096k memory, flags:0x1, mode table:0xc0799d22 (1000022)
VESA: NVidia
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <SOYO   AWRDACPI> on motherboard
pcibios: BIOS version 2.10
Using $PIR table, 8 entries at 0xc00fdee0
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0x5000-0x500f,0x4080-0x40ff,0x4000-0x407f,0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib0: slot 9 INTA is routed to irq 10
pcib0: slot 10 INTA is routed to irq 12
pcib0: slot 12 INTA is routed to irq 11
pcib0: slot 14 INTA is routed to irq 11
pcib0: slot 17 INTD is routed to irq 5
pcib0: slot 17 INTD is routed to irq 5
pcib0: slot 18 INTA is routed to irq 11
agp0: <VIA Generic host to PCI bridge> mem 0xd0000000-0xd7ffffff at device 0.0 on pci0

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x181
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc04dfa55
stack pointer           = 0x10:0xc0c21834
frame pointer           = 0x10:0xc0c21878
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 (swapper)
kernel: type 12 trap, code=0
Stopped at      rman_reserve_resource_bound+0x3d5:      movl    %ecx,0x4(%eax)
db> trace
rman_reserve_resource_bound(c071c1c0,d0000000,d7ffffff,8000000,0) at rman_reserve_resource_bound+0x3d5
rman_reserve_resource(c071c1c0,d0000000,d7ffffff,8000000,0) at rman_reserve_resource+0x3c
nexus_alloc_resource(c16a5480,c2d29380,3,c0c21ae8,d0000000) at nexus_alloc_resource+0xed
resource_list_alloc(c2d2930c,c16a6a80,c2d29380,3,c0c21ae8) at resource_list_alloc+0xdf
acpi_alloc_resource(c16a6a80,c2d29380,3,c0c21ae8,d0000000) at acpi_alloc_resource+0x54
bus_generic_alloc_resource(c16a6480,c2d29380,3,c0c21ae8,d0000000) at bus_generic_alloc_resource+0xaf
resource_list_alloc(c2d29304,c2d29400,c2d29380,3,c0c21ae8) at resource_list_alloc+0x1e4
pci_alloc_resource(c2d29400,c2d29380,3,c0c21ae8,0) at pci_alloc_resource+0x220
bus_alloc_resource(c2d29380,3,c0c21ae8,0,ffffffff) at bus_alloc_resource+0xb2
agp_generic_attach(c2d29380,c0c21b24,c04d5349,c2d29400,c2d29380) at agp_generic_attach+0x53
agp_via_attach(c2d29380,c2ce3098,c0675adc,c07fa845,6) at agp_via_attach+0x22
device_probe_and_attach(c2d29380,0,c0c21b98,c080c0ea,c2d29400) at device_probe_an+0xb0
bus_generic_attach(c2d29400,c169f700,1,c080bea0,c2d29400) at bus_generic_attach+0x28
acpi_pci_attach(c2d29400,c2cf8098,c0675adc,612e7768,2e697063) at acpi_pci_attach+0xda
device_probe_and_attach(c2d29400,c2d2ef40,c0c21bfc,c080c1cf,c16a6480) at device_probe_and_attach+0xb0
bus_generic_attach(c16a6480,c2d2ef50,0,c169f700,c2d2ef40) at bus_generic_attach+0x28
acpi_pcib_attach(c16a6480,c2d2ef50,0,c0c21c34,c04d5349) at acpi_pcib_attach+0xcf
acpi_pcib_acpi_attach(c16a6480,c2d18098,c0675adc,c07fa845,c16a6580) at acpi_pcib_acpi_attach+0x1ed
device_probe_and_attach(c16a6480,4,c0c21ca0,c0806294,c16a6a80) at device_probe_and_attach+0xb0
bus_generic_attach(c16a6a80,c1693720,64,c08062b0,c16a6a80) at bus_generic_attach+0x28
acpi_probe_children(c16a6a80,c0807ab0,c16a6a00,0,1a4) at acpi_probe_children+0x94
acpi_attach(c16a6a80,c2d04098,c0675adc,c0819528,c2cf7050) at acpi_attach+0x6ee
device_probe_and_attach(c16a6a80,c16a5480,c0c21d2c,c0612bbc,c16a5480) at device_probe_and_attach+0xb0
bus_generic_attach(c16a5480,c16a5480,c0c21d5c,c04d5fe0,c16a5480) at bus_generic_attach+0x28
nexus_attach(c16a5480,c2cb6098,c0675adc,c066d1ae,0) at nexus_attach+0x1c
device_probe_and_attach(c16a5480,c168fe78,c0c21d80,c06044c5,c16a5a00) at device_probe_and_attach+0xb0
root_bus_configure(c16a5a00,c066d1ae,0,c0c21d98,c0497465) at root_bus_configure+0x28
configure(0,c1e000,c1ec00,c1e000,0) at configure+0x35
mi_startup() at mi_startup+0xb5
begin() at begin+0x2c
db>