-current not booting (amd64)

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On up-to-date -current/amd64, I get the following at boot-time
(hand-copied):

acpiacad0: AC adapter online
uvm_fault(0xffffffff80c95b00, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff8047b162 cs 8 rflags 10217 cr2  c cpl 0
rsp ffff8 0004c0259d0
kernel: page fault trap, code=-
Stopped in pid 0.38 (system) at netbsd:config_stdsubmatch+0x52:  cmpl
0(%rcx,%rb x,1),%eax
 
 
config_stdsubmatch()
mapply() at netbsd:mapply+0x2d
config_search_loc() at netbsd:config_search_loc+0xcb
config_found_sm_loc at netbsd:config_found_sm_loc+0x3b
usbd_new_device() at netbsd:usbd_new_device+0x431
uhub_explore() at netbsd:uhub_explore+0x1c1
usb_discover() at netbsd:usb_discover+0x37
usb_event_thread() at netbsd:usb_event_thread+0x3e


Disabling ugen via 'boot -c' let me boot.


                --Steve Bellovin, http://www.cs.columbia.edu/~smb