debootstrap failure

In 2.1.4(i386)
I used
debootstrap —arch i386 lenny /mnt/debian http://ftp.us.debian.org/debian
It works fine until return:
failure frying to run: chroot /mnt/debian mount -t proc proc /proc

(from redmine: issue id 536, created on 2011-02-27, closed on 2011-03-07)