On Mon, 28 Aug 2006 14:23:21 +0200
"Zafer Aydogan" <zafer@aydogan.de> wrote:

> Juan, I tried it and nothing crashed.
> 
> My mounts:
> 
> % mount
> /dev/wd0a on / type lfs (local)
> /dev/wd1a on /usr/pkgsrc type ffs (local)
> /home/zafer/pkgsrc on /usr/pkgsrc type null (local)
> /usr/pkgsrc on /home/zafer/foo type null (local)
> 
> % uname -a
> NetBSD lfs2.aydogan.net 4.99.1 NetBSD 4.99.1 (GENERIC) #48: Sun Aug 20
> 19:49:49 CEST 2006
> zafer@h950596:/home/zafer/netbsd/usr/obj/sys/arch/i386/compile/GENERIC
> i386
> 
> % pwd
> /home/zafer/foo
> 
> % ls
> CVS             converters      games           misc            security
> Makefile        cross           geography       mk              shells
> --snip---
> 
> My harddisk was already  lfs. I added another one using ffs mounted to
> /usr/pkgsrc
> No surprises so far.

Can you try with mount_union and mount -o union? (they are not the same).