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FS#392 - udev ca't assemble root partition on software raid.
mdadm 3.2.1-4 has got broken hook for initcpio.
Problem occures when you move / to software raid. Result: udev is unable to assemble an array and booting ends with something like:
udevd: failed to execute '/sbin/mdadm' '/sbin/mdadm --examine --export /dev/sdb': No such file or directory
It looks like you've messed two hooks: mdadm for assembling arrays with /sbin/mdassemble and mdadm_udev for assembling arrays with udev and /sbin/mdadm.
Udev needs to have /sbin/mdadm but it's missing in initcpio image. Instead of it, there is /sbin/mdassemble.
I've created two patches which fixed it and made my system bootable.
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