this is fixed upstream already by commit https://github.com/neilbrown/mdadm/commit/1e08717f0b7856b389e9d5eb2dc330d146636183
that commit is included in zesty and later, this is needed only for trusty and xenial
this is fixed upstream already by commit https:/ /github. com/neilbrown/ mdadm/commit/ 1e08717f0b7856b 389e9d5eb2dc330 d146636183
that commit is included in zesty and later, this is needed only for trusty and xenial