drmkms panic

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On a box which was running a DRMKMS kernel, I just tried to boot
a GENERIC -current/amd64 kernel from source of 7.45am today, but
it consistently panics at:

==========================
trap type 6 code 0 rip ffffffff808b97d9 cs 8 rflags 10282 cr2 20 ilevel 8 rsp ff
ffffff81342838
curlwp 0xffffffff810d74a0 pid 0.1 lowest kstack 0xffffffff8133f2c0
kernel: page fault trap, code=0
Stopped in pid 0.1 (system) at netbsd:device_is_a+0x4: movq 20(%rdi),%rax
 
device_is_a()
intel_opregion_init()
i915_driver_load()
drm_dev_register()
drm_pci_attach()
i915drmkms_attach()
config_attach_loc()
pci_probe_device()
pci_enumerate_bus()
pcirescan()
pciattach()
config_attach_loc()
mp_pci_scan()
mainbus_attach()
config_attach_loc()
cpu_configure()
main()
==========================
intelfb0 at i915drmkms0
i915drmkms0: info: regsitered panic notifier
uvm_fault(0xffffffff8112220, 0x0, 1)->e
 
same backtrace
==========================

Cheers,

Patrick