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dmesg.log added

** Attachment added: "dmesg.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1563998/+attachment/4617358/+files/dmesg.log

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https://bugs.launchpad.net/bugs/1563998

Title:
  Ubuntu 16.04 Kernel 4.4.0-16 doesn't boot, cannot open root device

Status in linux package in Ubuntu:
  New

Bug description:
  - Thinkpad X230, latest Bios, BIOS Legacy Boot active
  - Ubuntu 16.04
  - Kernel 4.4.0-16
  - dm-crypt / LUKS full disk encryption setup during install with BTRFS as filesystems
  - partion layout:

  steven@thinkpad:~$ blkid 
  /dev/mapper/sdb2_crypt: UUID="DiTDe3-wjSv-YCFz-Lful-KBMl-BCWr-t2Jzry" TYPE="LVM2_member"
  /dev/mapper/vg_crypt-lv_root: LABEL="ROOT" UUID="0760638f-92f7-4bd9-a5b8-638002a1d699" UUID_SUB="b8c21ae4-99c7-470f-a2a1-24308c5177e7" TYPE="btrfs"
  /dev/sda1: LABEL="BOOT" UUID="895c6d03-cc2d-4303-b59e-eb8f5b6452f2" UUID_SUB="7e9d110f-7a6f-4c21-8438-e746acf53b9a" TYPE="btrfs" PARTUUID="83f8d594-01"
  /dev/sda2: UUID="0ce18f8a-9317-40c6-bb1d-cc5608b3b58d" TYPE="crypto_LUKS" PARTUUID="83f8d594-02"
  /dev/mapper/vg_crypt-lv_swap: UUID="8010fb1a-fdc0-40d6-a241-1d52d2a89f8f" TYPE="swap"

  - since Kernel 4.4.0-16-generic the system doesn't boot, it shows a "VFS: Cannot open root device "mapper/vg_crypt-lv_root" or unknown-block(0,0): error -6" error
  - see attached screenshots for more detailed error message
  - if i boot Kernel 4.4.0-15-generic then the boot is successfull

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