mountd stuck in ZFS code.

[Daniel Braniss]

I have been running the experimental nfs/mount for some time now, and
it mostly works, except with this particular case, where the mountd just
gets stuck:
 
 mountd 11762 [dp->dp_config_rwlock] 8.93r 0.00u 0.00s 0% 1320k
 
and stops respondig. I can't reproduce it at will, but it happens quiet often.

The host in question is an nfs/zfs server, runing 8-stable and zfs
	ZFS pool version 15
	ZFS filesystem version 4

cheers,
	danny