Bug in the DF application...

Alright, I've been using Debian for ages, and never ran across something
like this.  It makes me wonder if it is affecting other programs on the
system as well.  I installed GCC tonight and in the process it had to
upgrade libc6.  It upgraded properly, and when it finished I rebooted the
machine just to play it safe.  After it came back up I checked my free space
and got this:
 
Primary:~# df -ah
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda1            -405370878767k  1.0k  0.0k   9% /
proc                   -0k  0.0k  0.0k   -  /proc
/dev/hda2            -136628747263k  1.0k  0.0k  21% /var
/dev/hda3            -1900499642371k  1.0k  0.0k  48% /home
 
Clearly, the size is being reported wrong.  Prior to the upgrade of libc6,
it worked fine and reported in megabytes.  I tried using "df -ahm" and it
reported negative megabytes.  I even went as far as upgrading everything on
the system using apt, and the problem still exists.  Is there a fix for this
or is it time to find somewhere to store /home, then format and reinstall?