I can't boot normally with encrypted swap

[sz gy]

Hi!

I installed Ubuntu 15.10 64bit desktop with the following partition
schema:

szimszon@szimszon-kili:~$ sudo fdisk /dev/sda

Welcome to fdisk (util-linux 2.26.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Parancs (m = súgó): p
Disk /dev/sda: 465,8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: E83FD0FA-89C7-4523-A002-259C93091BE7

Eszköz Start Vége Szektorok Size Típus
/dev/sda1 2048 499711 497664 243M EFI System
/dev/sda2 499712 1499135 999424 488M Linux filesystem
/dev/sda3 1499136 974155775 972656640 463,8G Linux filesystem
/dev/sda4 974155776 976771071 2615296 1,3G Linux lapozó

fstab:
=====================================
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/mapper/sda3_crypt / btrfs defaults,subvol=@ 0 1
# /boot was on /dev/sda2 during installation
UUID=f19afe7d-3905-4e0a-aefa-6684150b15f5 /boot ext4
defaults 0 2
# /boot/efi was on /dev/sda1 during installation
UUID=BF13-E9D2 /boot/efi vfat umask=0077 0 1
/dev/mapper/sda3_crypt /home btrfs defaults,subvol=@home
0 2
/dev/mapper/sda4_crypt none swap sw 0 0
======================================

lsblk:
======================================
szimszon@szimszon-kili:~$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465,8G 0 disk ├─sda1 8:1 0
243M 0 part /boot/efi
├─sda2 8:2 0 488M 0 part /boot
├─sda3 8:3 0 463,8G 0 part │ └─sda3_crypt 252:0 0
463,8G 0 crypt /home
└─sda4 8:4 0 1,3G 0 part
======================================

After the second boot the system can't find the swap space and I have to
wait 1:30 minute to timeout the process to do something with the swap
space.

I have a crypt partition on sda3 (this is the root partition with btrfs
in it), and sda4 (for swap space).

Now if I try to open the sda3 I got an error that the partition is not
an encrypted one:

=======================================
szimszon@szimszon-kili:~$ sudo cryptsetup luksOpen /dev/sda4 sda4_crypt
Device /dev/sda4 is not a valid LUKS device.
=======================================
   affects ubuntu/boot

--
Üdvözlettel:
  Gyuris Szabolcs
  <email address hidden>

http://oregpreshaz.eu
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[sz gy (gyszabolcs)]

Lines from syslog:

Nov 13 09:03:40 szimszon-kili systemd[1]: dev-disk-by\x2duuid-31375131\x2df654\x2d4c0a\x2d9872\x2d0b321cbc258c.device: Job dev-disk-by\x2duuid-31375131\x2df654\x2d4c0a\x2d9872\x2d0b321cbc258c.d
evice/start timed out.
Nov 13 09:03:40 szimszon-kili systemd[1]: Timed out waiting for device dev-disk-by\x2duuid-31375131\x2df654\x2d4c0a\x2d9872\x2d0b321cbc258c.device.
Nov 13 09:03:40 szimszon-kili systemd[1]: Dependency failed for Cryptography Setup for sda4_crypt.
Nov 13 09:03:40 szimszon-kili systemd[1]: Dependency failed for dev-mapper-sda4_crypt.device.
Nov 13 09:03:40 szimszon-kili systemd[1]: Dependency failed for /dev/mapper/sda4_crypt.
Nov 13 09:03:40 szimszon-kili systemd[1]: dev-mapper-sda4_crypt.swap: Job dev-mapper-sda4_crypt.swap/start failed with result 'dependency'.
Nov 13 09:03:40 szimszon-kili systemd[1]: Startup finished in 18.577s (kernel) + 3min 1.120s (userspace) = 3min 55.153s.
Nov 13 09:03:40 szimszon-kili systemd[1]: dev-mapper-sda4_crypt.device: Job dev-mapper-sda4_crypt.device/start failed with result 'dependency'.
Nov 13 09:03:40 szimszon-kili systemd[1]: systemd-cryptsetup@sda4_crypt.service: Job systemd-cryptsetup@sda4_crypt.service/start failed with result 'dependency'.
Nov 13 09:03:40 szimszon-kili systemd[1]: dev-disk-by\x2duuid-31375131\x2df654\x2d4c0a\x2d9872\x2d0b321cbc258c.device: Job dev-disk-by\x2duuid-31375131\x2df654\x2d4c0a\x2d9872\x2d0b321cbc258c.d
evice/start failed with result 'timeout'.