@@ -64,3 +64,28 @@ func TestDiffEnsureDockerinitFilesAreIgnored(t *testing.T) {

 	logDone("diff - check if ignored files show up in diff")

 }

+

+func TestDiffEnsureOnlyKmsgAndPtmx(t *testing.T) {

+	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sleep 0")

+	cid, _, err := runCommandWithOutput(runCmd)

+	errorOut(err, t, fmt.Sprintf("%s", err))

+	cleanCID := stripTrailingCharacters(cid)

+

+	diffCmd := exec.Command(dockerBinary, "diff", cleanCID)

+	out, _, err := runCommandWithOutput(diffCmd)

+	errorOut(err, t, fmt.Sprintf("failed to run diff: %v %v", out, err))

+	go deleteContainer(cleanCID)

+

+	expected := map[string]bool{

+		"C /dev":      true,

+		"A /dev/full": true, // busybox

+		"C /dev/ptmx": true, // libcontainer

+		"A /dev/kmsg": true, // lxc

+	}

+

+	for _, line := range strings.Split(out, "\n") {

+		if line != "" && !expected[line] {

+			t.Errorf("'%s' is shown in the diff but shouldn't", line)

+		}

+	}

+}