We've been annoyed that stateless-linux machines with / mounted as NFS couldn't reboot. It always barfed with infinite RPC 101 errors.
Reason: It's bad to unmount / before you are done rebooting.
Quick and dirty solution:
rm /etc/rc{0,6}.d/{K75netfs,K90network}
Alternate solution:
Make stateless-snapshooter remove these files.
The best solution would probably be to make netfs and network stateless aware and not shut down networking or unmount / if / is mounted as NFS. The reason is that it's ok to unmount SMB or CIFS filesystems and problably even most NFS filsesystems except / and maybe /usr.
/cjk