Run "git clone https://gist.github.com/cca880c647263eb5e98d9f1e0d60a3c5.git replicate-docker-issue-21950 && bash replicate-docker-issue-21950/replicate-docker-issue-21950.sh" to replicate https://github.com/docker/docker/issues/21950

Dockerfile

FROM busybox
COPY . /

Dockerfile.update

FROM test
COPY . /

replicate-docker-issue-21950.sh

#!/usr/bin/env bash

cd replicate-docker-issue-21950

dd if=/dev/zero of=0.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=1.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=2.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=3.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=4.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=5.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=6.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=7.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=8.data bs=1 count=0 seek=10000000
dd if=/dev/zero of=9.data bs=1 count=0 seek=10000000

set -x
docker version
docker info
docker build -t test .
echo foo >> 0.data
docker build -t test -f Dockerfile.update .                                                         
docker history test