netbsd-6 from 26-July-2012 hanging

Hi,

Since netbsd-6 is an ever-moving target still, I figured I'd ask here 
first. I compiled a netbsd-6 GENERIC kernel and put it on my VAXstation 
4000/90a along with netbsd-6 base.tgz. After reboot, it hangs. If I boot 
using a netbsd-5 userland, the kernel boots fine. If I boot -a, it asks 
for init, then hangs.

...
scsibus0: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <IBM-IC35, L180AVV207-1, V2FB> disk fixed
sd0: 172 GB, 89752 cyl, 64 head, 63 sec, 512 bytes/sect x 361882080 
sectors
sd0: sync (160.00ns offset 8), 8-bit (6.250MB/s) transfers, tagged 
queueing
boot device: sd0
root on sd0a dumps on sd0b
root on sd0a dumps on sd0b
root file system type: ffs

The only way out is dropping to the boot ROM prompt. There is no response 
on the serial port when it hangs.

?02 EXT HLT
   PC= 800BC373 PSL= 00C00004

Ideas?

Thanks,
John