This was due to /dev/md0 also having a raid superblock (must have been created by accident). Removing the superblock fixed it. I'd say it should at least drop to busybox because otherwise you're pretty lost with finding the problem.
This was due to /dev/md0 also having a raid superblock (must have been created by accident). Removing the superblock fixed it.
I'd say it should at least drop to busybox because otherwise you're pretty lost with finding the problem.