Same problem for me. I have described my symptoms and solution at https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/136252/comments/5 as it was configuration related.
Same problem for me. I have described my symptoms and solution at https:/ /bugs.launchpad .net/ubuntu/ +source/ mdadm/+ bug/136252/ comments/ 5 as it was configuration related.