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[Ryan S Kingsbury <1426782@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1362884 ***
    https://bugs.launchpad.net/bugs/1362884

Here is the dmesg output at the time of the error message:

[    8.515396] BTRFS: device fsid e91f611f-524a-43f5-bde5-8ebb9672f146 devid 2 transid 100593 /dev/dm-0
[    8.525319] BTRFS info (device dm-0): enabling auto defrag
[    8.525322] BTRFS info (device dm-0): disk space caching is enabled
[    8.526281] BTRFS: failed to read the system array on dm-0
[    8.547852] BTRFS: open_ctree failed
[   10.106655] BTRFS: device fsid e91f611f-524a-43f5-bde5-8ebb9672f146 devid 3 transid 100593 /dev/dm-1
[   10.943981] init: mountall main process (334) terminated with status 2
[   10.972131] init: plymouth-upstart-bridge main process ended, respawning
[   10.976545] init: plymouth-upstart-bridge main process (1253) terminated with status 1
[   10.976550] init: plymouth-upstart-bridge main process ended, respawning
[   19.846926] BTRFS info (device dm-1): enabling auto defrag
[   19.846929] BTRFS info (device dm-1): disk space caching is enabled
[   19.901994] BTRFS: bdev /dev/dm-0 errs: wr 0, rd 79, flush 0, corrupt 0, gen 0
[   23.125160] init: failsafe main process (1465) killed by TERM signal

** This bug has been marked a duplicate of bug 1362884
   Only one device of multidevice btrfs is decrypted in cryptroot

** No longer affects: upstart (Ubuntu)

** Also affects: cryptsetup (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1426782

Title:
  Boot fails with encyprted BTRFS RAID1 array - open ctree failed

Status in The Linux Mint Distribution:
  New
Status in cryptsetup package in Ubuntu:
  New

Bug description:
  I have recently installed Linux Mint 17.1  into a system with three
  drives - 1 SSD containing the / partition (btrfs format), and 2
  identical HDD's containing /home in an encrypted BTRFS RAID1 array.
  The system will not boot without manual intervention, using either the
  recommended 3.13.0-37 kernel or the most up to date 3.16.0-31 kernel.

  At about the same time that I am prompted to enter my password to
  unlock the drive, I am prompted that a mount has failed. If I press M
  to enter manual recovery I see the emergency shell. Then all I have to
  do is exit (Ctrl+D) to continue booting and everything works normally.

  It appears that a similar (maybe the same) bug was reported on ArchWiki:
  https://wiki.archlinux.org/index.php/Btrfs#BTRFS:_open_ctree_failed

  I also experienced this bug on OpenSUSE 13.2 and filed a bug report there:
  https://bugzilla.opensuse.org/show_bug.cgi?id=912170

  On a possibly related note, I am getting TWO password prompts even
  though both encrypted volumes use the same password. On OpenSUSE only
  one password was required. My understanding is that as soon as you
  suppy one password it is supposed to be tried on each volume in
  /etc/crypttab.

  I will now try the fix that worked for me on OpenSUSE (see bug report)

  copy /usr/lib/udev/rules.d/64-btrfs.rules into
  /etc/udev/rules.d/64-btrfs.rules and replace the following two lines

  ENV{DM_NAME}=="", IMPORT{builtin}="btrfs ready $devnode"
  ENV{DM_NAME}=="?*", IMPORT{builtin}="btrfs ready /dev/mapper/$env{DM_NAME}"

  with single one

  IMPORT{builtin}="btrfs ready $devnode"

  and report back what happens.

  Some system information:
  =====================

  relevant excerpts from /etc/fstab:

  # SSD containing the main system
  # / was on /dev/sda3 during installation
  UUID=00a0b482-a861-400f-b29c-b003cbc697f9 /               btrfs   defaults,autodefrag,discard,space_cache 0 0
  # /boot/efi was on /dev/sda2 during installation
  UUID=26CC-DC02  /boot/efi       vfat    defaults        0       1

  # encrypted RAID1 btrfs array containing /home
  # the btrfs devid's are 2 and 3
  UUID=e91f611f-524a-43f5-bde5-8ebb9672f146 /home           btrfs   defaults,discard,autodefrag,space_cache 0 0

  /etc/crypttab:
  encrypted-home-sdb UUID=9c8fb7d0-74e2-4e38-b7c7-6211bbb6d2b1 none luks, retry=1
  encrypted-home-sdc UUID=1ca9d3ba-c409-4127-91f5-e3d9c21242bd none luks, retry=1

  relevant excerpts from dmesg:

  [    9.487085] BTRFS: device fsid e91f611f-524a-43f5-bde5-8ebb9672f146 devid 3 transid 81360 /dev/dm-0
  [    9.497773] BTRFS info (device dm-0): turning on discard
  [    9.497776] BTRFS info (device dm-0): enabling auto defrag
  [    9.497777] BTRFS info (device dm-0): disk space caching is enabled
  [    9.498565] BTRFS: failed to read the system array on dm-0
  [    9.522859] BTRFS: open_ctree failed
  [   10.246821] init: mountall main process (322) terminated with status 2
  [   10.275253] init: plymouth-upstart-bridge main process ended, respawning
  [   11.110362] BTRFS info (device dm-0): turning on discard
  [   11.110365] BTRFS info (device dm-0): enabling auto defrag
  [   11.110366] BTRFS info (device dm-0): disk space caching is enabled
  [   11.113918] BTRFS: failed to read the system array on dm-0
  [   11.129428] BTRFS: open_ctree failed
  [   11.714810] BTRFS: device fsid e91f611f-524a-43f5-bde5-8ebb9672f146 devid 2 transid 81360 /dev/dm-1
  [   12.628797] init: mountall main process (1033) terminated with status 2
  [   13.088968] BTRFS info (device dm-1): turning on discard
  [   13.088971] BTRFS info (device dm-1): enabling auto defrag
  [   13.088973] BTRFS info (device dm-1): disk space caching is enabled
  [   13.145755] BTRFS: bdev /dev/mapper/encrypted-home-sdb errs: wr 0, rd 79, flush 0, corrupt 0, gen 0
  [   16.111916] init: failsafe main process (1436) killed by TERM signal

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