page fault panic in device_get_softc/acpi_pcib_route_interrupt

Got this during boot on an IBM x345, three hour old kernel.
Last working kernel is from 5 days ago, later than that hangs
after probing the mpt controller (don't have the details on
that now since this happened while I was about the debug the
mpt issue).

Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x488-0x48b on acpi0
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> on acpi0
pci0: <ACPI PCI bus> on pcib0


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x48
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc051b827
stack pointer           = 0x10:0xc08208f4
frame pointer           = 0x10:0xc08209f8
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)
[thread pid 0 tid 0 ]
Stopped at      device_get_softc+0x7:   movl    0x48(%eax),%eax
db> tr
Tracing pid 0 tid 0 td 0xc06e4080
device_get_softc(0,0,c0820a28,c0820a3c,2) at device_get_softc+0x7
acpi_pcib_route_interrupt(c1f17d00,c1f8b780,1,c1f7f1d4,1) at 
acpi_pcib_route_interrupt+0x33c
acpi_pcib_acpi_route_interrupt(c1f17d00,c1f8b780,1,c06bc690,c1f8b808) at 
acpi_pcib_acpi_route_interrupt+0x2f
pci_assign_interrupt_method(c1f17a00,c1f8b780,f,2,24) at 
pci_assign_interrupt_method+0x71
pci_add_child(c1f17a00,c1f8b800,f,2,80) at pci_add_child+0x207
pci_add_children(c1f17a00,0,80,c0820b54,c051dbff) at 
pci_add_children+0x123
acpi_pci_attach(c1f17a00,c1f4504c,c06b5cdc,c069ed37,0) at 
acpi_pci_attach+0x86
device_attach(c1f17a00,c1ed6d80,c0820bdc,c07b93fc,c1f17d00) at 
device_attach+0x2c9
bus_generic_attach(c1f17d00,c07ccea9,0,c0820bcc,0) at 
bus_generic_attach+0x18
acpi_pcib_attach(c1f17d00,c1f7f1d4,0,c0820c04,c07b4497) at 
acpi_pcib_attach+0xec
acpi_pcib_acpi_attach(c1f17d00,c1f4484c,c06b5cdc,c069ed37,0) at 
acpi_pcib_acpi_attach+0xf9
device_attach(c1f17d00,2f,c0820cbc,c07b6924,c1ed6d80) at 
device_attach+0x2c9
bus_generic_attach(c1ed6d80,2e,2f,c1f7ec08,2e) at bus_generic_attach+0x18
acpi_attach(c1ed6d80,c1f4704c,c06b5cdc,c069ed37,0) at acpi_attach+0x7b4
device_attach(c1ed6d80,c1f16000,c0820d18,c066ee8a,c1f16000) at 
device_attach+0x2c9
bus_generic_attach(c1f16000,c1f1604c,c0820d54,c051cba9,c1f16000) at 
bus_generic_attach+0x18
nexus_attach(c1f16000,c1f3c84c,c06b5cdc,c069ed37,0) at nexus_attach+0x1a
device_attach(c1f16000,c06d2170,c0820d78,c065c068,c1f16880) at 
device_attach+0x2c9
root_bus_configure(c1f16880,c06afbd2,0,c0820d98,c04cf1c6) at 
root_bus_configure+0x19
configure(0,0,c1e6f7a4,81ec00,81e000) at configure+0x28
mi_startup() at mi_startup+0xd6
begin() at begin+0x2c

-- 
Pawel