From: Frank T Lofaro (fl0p+@andrew.cmu.edu)
Date: 11/14/92 

From: fl0p+@andrew.cmu.edu (Frank T Lofaro)
Subject: df can't find mountpoint for . when in root fs (Re: Root filesystem acting strangely)
Date: 14 Nov 1992 17:37:25 GMT

    Sounds like the entry for / isn't in /etc/mtab like it should be.
rdev > /etc/mtab is a good idea for your /etc/rc before the /etc/mount -a.
I hope this helps.