SYSTEMD_LOG_LEVEL=debug strace -fvvs1024 -o /tmp/t /lib/systemd/systemd-
cryptsetup attach vg-swap dev/dm-6 /dev/urandom swap,cipher=aes-cbc-
essiv:sha256

crypt_init() failed: Block device required

if I put a / in front of /dev/dm-6 I'm getting the flowing:
SYSTEMD_LOG_LEVEL=debug strace -fvvs1024 -o /tmp/tt 
/lib/systemd/systemd-cryptsetup attach vg-swap /dev/dm-6 /dev/urandom 
swap,cipher=aes-cbc-essiv:sha256

Set cipher aes, mode cbc-essiv:sha256, key size 256 bits for device /dev/dm-6.
Failed to activate with key file '/dev/urandom': Invalid argument
Please enter passphrase for disk vg-swap on none! 

<Just pressing Enter, because I can't remember the passphrase any more>

Loading of cryptographic parameters failed: Invalid argument
Failed to activate: Invalid argument

But this could it be, it waits for input and because no one is coming it
waits for ever ;-)

do you still need the output of /tmp/tt?

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https://bugs.launchpad.net/bugs/1443413

Title:
  boot fails on cryptsetup random swap partition with "invalid argument"

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