Current amd64 kernel not booting (acpi related)

[Jukka Andberg <jukka.andberg%welho.com@localhost>]

Hi,

I'm seeing that recent -current kernels crash for me on boot on amd64.

--- (copied by hand, might be some typos)

uvm_fault(0xffffffff811fda00, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff804f7919 cs 8 rflags 10297 cr2 38 ilevel 8 rsp ffffffff813cc950
curlwp 0xffffffff8114f420 pid 0.1 lowest kstack 0xffffffff813c92c0
kernel: page fault trap, code=0
Stopped in pid 0.1 (system) at  netbsd:AcpiOsReadPciConfiguration+0x4b: movq 38(%rax),%rdi

db{0}> bt
AcpiOsReadPciConfiguration() at netbsd:AcpiOsReadPciConfiguration+0x4b
AcpiEvAddressSpaceDispatch() at netbsd:AcpiEvAddressSpaceDispatch+0xf7
AcpiExAccessRegion() at netbsd:AcpiExAccessRegion+0x195
AcpiExFieldDatumIo() at netbsd:AcpiExFieldDatumIo+0xa6
AcpiExExtractFromField() at netbsd:AcpiExExtractFromField+0xad
AcpiExReadDataFromField() at netbsd:AcpiExReadDataFromField+0xbd
AcpiExResolveNodeToValue() at netbsd:AcpiExResolveNodeToValue+0xff
AcpiExResolveToValue() at netbsd:AcpiExResolveToValue+0x70
AcpiDsEvaluationNamePath() at netbsd:AcpiDsEvaluateNamePath+0xa0
AcpiDsExecEndOp() at netbsd:AcpiDsExecEndOp+0x23a
AcpiPsParseLoop() at netbsd:AcpiPsParseLoop+0xf0
AcpiPsParseAml() at netbsd:AcpiPsParseAml+0x1eb
AcpiPsExecuteMethod() at netbsd:AcpiPsExecuteMethod+0x10a
AcpiNsEvaluate() at netbsd:AcpiNsEvaluate+0x129
AcpiNsExecModuleCodeList() at netbsd:AcpiNsExecModuleCodeList+0x10a
AcpiNsLoadTable() at netbsd:AcpiNsLoadTable+0xcc
AcpiTbLoadNamespace() at netbsd:AcpiTbLoadNamespace+0xd1
AcpiLoadTables() at netbsd:AcpiLoadTables+0xa
acpi_probe() at netbsd:acpi_probe+0x73
mainbus_attach() at netbsd:mainbus_attach+0x227
config_attach_loc() at netbsd:config_attach_loc+0x17a
cpu_configure() at netbsd:cpu_configure+0x26
main() at netbsd:main+0x29d

Looks like it is going for 0 acpi_softc.