tar not working in an i386 chroot (getvfsbyname)

Hi,

While trying to compile FreeBSD 10 packages I encountered this error:
# chroot /scratchpad/freebsd10_i386 tar -cf /dev/null root 
tar: getvfsbyname failed: No such file or directory
tar: Error exit delayed from previous errors.

The kernel does have COMPAT_FREEBSD32 in it.  To reproduce this (on an 
FreeBSD10/amd64 machine) do:
# cd /usr/src
# make -sj16 buildworld installworld DESTDIR=/scratchpad/freebsd10_i386
# chroot /scratchpad/freebsd10_i386 tar -cf /dev/null root

Regards