The autofs script has been 'enhanced' in 6.9 to remove
duplicate auto.master entries.  Nice idea, however, 
the implementation is faulty.  We have the following
entries in our yp auto.master (amoung others)

/users auto.users   -rw,hard,intr,noquota
/tools auto.project  -rw,hard,intr,noquota
/user auto.users   -rw,hard,intr,noquota
/home auto.users   -rw,hard,intr,noquota
/wv auto.wv    -rw,hard,intr,noquota
 
Since the code right now does a simple 
    "`echo "$knownmaps" | grep $dir`" = ""
rather than searching for duplicate entries, it searches 
for previous entries that contain the later string.

It was real surprising to see most of the mounts appear but
/user wouldn't mount.  (because /users was already a mount point.)