On Wed, 18 Feb 2009 10:44:31 -0900, Mel <fbsd.questi...@rachie.is-a-geek.net> 
> Can you show mount -p before trying to unmount /usr? On the off-chance 
> /export 
> or /export/home is really a symlink to /usr/home (mount -p shows realpath(3) 
> for mounts).

Hm, I keep /home out of /usr, so there's only a symlink (for the
obvious compatibility reasons) /home@ -> export/home.

BUT, and now the big surprise, maybe a possibility:

% mount -p
/dev/ad0s1a             /                       ufs     rw              1 1
devfs                   /dev                    devfs   rw              0 0
/dev/ad0s1d             /tmp                    ufs     rw              2 2
/dev/ad0s1e             /var                    ufs     rw              2 2
/dev/ad0s1f             /usr                    ufs     rw              2 2
/dev/ad0s1g             /export/home            ufs     rw              2 2
devfs                   /var/named/dev          devfs   rw              0 0
linprocfs               /usr/compat/linux/proc  linprocfs       rw             
0 0
                        ^^^^ Haha!!!

It seems that the linprocfs prevents umounting of /usr because its
mountpoint /usr/compat/linux/proc is de facto INSIDE /usr.

I've checked this while in SUM: When umounting linprocfs prior to
/usr, no problems occur.

I'll speak to Mr. Tritter so he can stop his investigations. Seems
that we found the reason.

Thanks for your help.

Seems that I'm too stupid to own a computer. :-)

>From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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