Comment 19 for bug 368986

I'm sorry but I've no time now to deal with this bug again, but it's easy to reproduce: launch an EC2 instance with Ubuntu 10.04 64bit EBS (AMI ami-3abf954e in EU as you can find here http://uec-images.ubuntu.com/releases/lucid/release/ ), attach a couple of EBS disks to it just to test, then try to create a new RAID0 in /dev/md0 and you'll get an error (even /proc/mdstat doesn't not exist if I remember correctly). Applying your patch let the installation of mdadm finish but doesn't solve the problems with RAID.