Verified again with zesty and 3.4-4ubuntu0.1, all is good and reboots result in raid array coming up in sync in about 3 minutes time.
Also have another verification on xenial at https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1608495 that non-rootfs raid arrays are fixed too.
Verified again with zesty and 3.4-4ubuntu0.1, all is good and reboots result in raid array coming up in sync in about 3 minutes time.
Also have another verification on xenial at https:/ /bugs.launchpad .net/ubuntu/ +source/ mdadm/+ bug/1608495 that non-rootfs raid arrays are fixed too.