Comment 16 for bug 211631

I fix it on my system too changing the order umountnfs executes on inits 0 and 6 and think it may no have any problems as it says not root neither top levels mounts are unmount (the ones system need to continue shutdown properly):

# Short-Description: Unmount all network filesystems except the root file system.
# Description: Also unmounts all virtual filesystems (proc, devfs, devpts,
# usbfs, sysfs) that are not mounted at the top level.