Bug#791944: udev: shutdown hangs because of missing swapoff

[Jochen Sprickerhof]

I've debugged a little more and actually it's not only enough to do a
swapoff -a, but you need also a cryptsetup close /dev/mapper/swap0
(sorry for forgetting it initiallly).
The shutdown hangs in the do_close() of
/lib/cryptsetup/cryptdisks.functions (line 556), where cryptsetup remove
is call. Adding a -v --debug gives:

[..]
# Initialising device-mapper backend library.
# dm table swap0 OFW     [16384[ (*1)
# Trying to open and read device /dev/sda5.
# Deactivating volume swap0.
# dm status swap0  OF   [16384] (*1)
# Udev cookie 0xd4d9dac (semid 65536) created
# Udev cookie 0xd4d9dac (semid 65536) incremented to 1
# Udev cookie 0xd4d9dac (semid 65536) incremented to 2
# Udev cookie 0xd4d9dac (semid 65536) assigned to REMOVE task(2) with flags      (0x0)
# dm remove swap0  OF     [16384] (*1)
# swap0: Stacking NODE_DEL [verify_udev]
# Udev cookie 0xd4d9dac (semid 65536) decrementing to 1
# Udev cookie 0xd4d9dac (semid 65536) waiting for zero
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