cgd breakage

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

I've been running a Sun Aug 9 2015 7.99.20/amd64 kernel with /home on
cgd. I just rebooted with one built just now with up to date source, and
fsck complains:

** /dev/rcgd0a
BAD SUPER BLOCK: CAN'T FIND SUPERBLOCK
/dev/rcgd0a: CANNOT FIGURE OUT SECTORS PER CYLINDER

or after another try:

** /dev/rcgd0a

CANNOT READ: BLK 209343840
CONTINUE? [yn] n



Put the old kernel back (userland untouched throughout) and all is well,
/home is mounted successfully, fsck marks rcgd0a clean and it stays that
way.

Thoughts?

Cheers,

Patrick