Failure on a netboot of a -current kernel:

NetBSD 1.5V (MVAXII) #0: Mon May 28 08:59:09 EDT 2001
    kwellsch@vs4090a:/usr/src/sys/arch/vax/compile/MVAXII

MicroVAX II
total memory = 9208 KB
avail memory = 6408 KB
using 140 buffers containing 560 KB of memory
mainbus0 (root)
ibus0 at mainbus0
uba0 at ibus0: Q22
dhu0 at uba0 csr 160440 vec 300 ipl 17
dhu0: rom(1) version 2 rom(0) version 2
dhu0: DHV-11
mtc0 at uba0 csr 174500 vec 774 ipl 17
mscpbus0 at mtc0: version 4 model 3
mscpbus0: DMA burst size set to 4
mt0 at mscpbus0 drive 0: TK50
uda0 at uba0 csr 172150 vec 770 ipl 17
mscpbus1 at uda0: version 0 model 13
mscpbus1: DMA burst size set to 4
ra0 at mscpbus1 drive 0: RA80
panic: ptelen fault in system space: addr b2b2efe3 pc 800b8f1c
syncing disks... done