Still no luck reproducing the error. I am using the test script below at v4.13-rc2. Do you mind checking my script to see what I am missing? #!/bin/bash set -ex while grep /dev/sdb /proc/mounts;do umount /dev/sdb; done mke2fs -F -t ext4 /dev/sdb mount /dev/sdb /mnt/sdb cd /mnt/sdb mkdir xattrhashtest cd xattrhashtest/ mkdir upper lower work mnt cd lower/ echo foo > bar ln bar baz cd .. mount -t overlay overlay -olowerdir=lower,upperdir=upper,workdir=work mnt cd mnt/ echo xxx >> bar cd /root umount overlay umount /dev/sdb e2fsck -f -n /dev/sdb echo done