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Running Ubuntu vivid (alpha) with systemd. Bug same in my customized
dracut initramfs , Ubuntu's initramfs-tools initramfs, or post boot from
the command line. Udev package is udev_218-2ubuntu3_amd64.deb and its
related udev packages. Using udev 217 or earlier cryptsetup opens my 3
disk mdadm raid volume at boot along with two cryptsetup volumes on SDD
partitions.  Using udev 218 the single device encrypted partitions all
open fine, but the RAID volume does not,  instead generating  "could not
remove ioctl" errors listing further details  "device temporary-
cryptsetup-(various numbers)." It would try five times and give up. The
RAID itself does comes up, trying to open it from the command line gave
me the errors reported above.

A Startpage search said this kind of thing normally come from issues
with udev rules.  The udev rules for mdadm are not included with the
udev packages, I am guessing they are in the mdadm packages so they were
not changed by this update.

Rolling back to udev 217 fixed this and allowed the mdadm raid volume to
unlock normally. On this machine reproduction is simple: update to udev
218, make a new initramfs and try to reboot. The "cryptraid" volume
hosted on the 3 disk raid will not unlock and cannot be unlocked post
boot-not even be removing the hard drives and putting them back in their
hotswap trays.

Hardware is AMD FX 8120/Radeon HD 6750, motherboard uses FX 990 chipset.
The three 2 TB drives are partitioned, the mdadm volume is assembled
from the 3 partitions, the cryptsetup volume hosted on it is not
partitioned, contains a single large (6TB) ext4 filesystem.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: Fix Released

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encrypted mdadam raid cannot be unlocked with udev 218
https://bugs.launchpad.net/bugs/1405531
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