Solved.
Rebuilded boot-tree from chroot.
Still i can't understand why my lsblk and fstab are not the same opinion about the name of my partitions:
igrk@ obarunS6 ~ % lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 1 0B 0 disk
sdb 8:16 0 465,8G 0 disk
├─sdb1 8:17 0 512M 0 part /boot
├─sdb2 8:18 0 3,1G 0 part [SWAP]
├─sdb3 8:19 0 15,5G 0 part /
└─sdb4 8:20 0 446,6G 0 part /home
sr0 11:0 1 1024M 0 rom
igrk@ obarunS6 ~ % cat /etc/fstab
# /dev/sda3
UUID=016bf4b9-a9db-4cfd-b4eb-f548a0f944ab / ext4 rw,relatime 0 1
# /dev/sda1
UUID=9a79c8ff-d3c9-43fc-9b14-ed00414d7701 /boot ext4 rw,relatime 0 2
# /dev/sda4
UUID=d95db30f-f0a9-4c09-b5e5-d09da013decb /home ext4 rw,relatime 0 2
# /dev/sda2
UUID=9993ae43-dc39-4d9b-b1a6-544439dc7ef5 none swap defaults 0 0
igrk@ obarunS6 ~ %