I was trying to

newfs_msdos -F 16 wd1e

and

fatal integer divide fault in supervisor mode
trap type 8 code 0 eip c02cc76c cs 8 eflags 10246 cr2 e38d7301 cpl 0
panic: trap

nm /netbsd | sort | more

...
c02cc62c t gcc2_compiled.
c02cc62c t mbr_findslice
c02cc6c8 T readdisklabel
c02cca8c T setdisklabel
c02ccb88 T writedisklabel
c02ccd20 T bounds_check_with_label
...

The CF card in question is a 128 MB one:

wdc2 at pcmcia0 function 0 port 0x400-0x40f
wd1 at wdc2 channel 0 drive 0: < 128MB>
wd1: drive supports 1-sector PIO transfers, chs addressing
wd1: 0, 978 cyl, 0 head, 3 sec, 512 bytes/sect x 0 sectors
pcmcia0: card irq 9

  -jm