ext2 drives under 5.3 not umounting on reboots

[M. Parsons]

I have a ext2 linux partition mounted under /linux via the fstab line:

/dev/ad2s1             /linux          ext2fs  rw              1       2

It will automount on bootup, but if I do a reboot or shutdown -h now, it 
doesnt get umounted properly.  In fact, if this /linux is mounted, then 
/, /usr, /var, and /tmp (all seperate ufs slices on another hard drive) 
also get tainted during a reboot.  And on the next startup I get the 
good ole: WARNING: /usr was not properly dismounted, leaving me to fsck 
the drives in single mode (which sucks, as the fbsd machine is a 
headless NAT machine).  Running fsck in single mode does fix everything.

So whats going on here?  reboot aint properly umounting partitions, and 
fsck doesnt seem to be properly running during bootup if it detects 
tainted filesystems.

Any ideas?

Freebsd 5.3 SMP kernel.