Filesystem     1K-blocks     Used Available Use% Mounted on
-               83873280 33613180  50260100  41% /

mount -t proc proc <target chroot>/proc
mount -o bind dev <target chroot>/dev

chroot <target chroot>
grep -v rootfs /proc/mounts > /etc/mtab

proc /proc proc rw,relatime 0 0
devtmpfs /dev devtmpfs rw,nosuid,size=16286476k,nr_inodes=4071619,mode=755 0 0