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[god <1452165@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If btrfs volume is corrupted (separate /home partition, not even / !!!)
than not only booting ubuntu in normal AND recovery mode is impossible
but even liveusb fails as well. The recovery drops to shell but it's
impossible to fix btrfs - there's unkillable mount -t btrfs... process
hanging and kernel regularly pukes with "btrfs-transacti blocked for 120
seconds" message.

This is beyond horrible - the whole purpose of recovery mode is to fix
errors like that, errors on partition which is not used to boot from (e.
g. /home) should never ever break it. Alternatively you could add new
mode to grub menu - smth like "recovery which actually works" or
something like that.

The workaround is to add 'break=premount' to grub command line and fix
btrfs with 'btrfs check --repair /dev/dm-....' from initramfs.

Found on xubuntu 15.04 x86_64.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1452165

Title:
  currupted btrfs breaks both recovery and boot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  If btrfs volume is corrupted (separate /home partition, not even /
  !!!) than not only booting ubuntu in normal AND recovery mode is
  impossible but even liveusb fails as well. The recovery drops to shell
  but it's impossible to fix btrfs - there's unkillable mount -t
  btrfs... process hanging and kernel regularly pukes with "btrfs-
  transacti blocked for 120 seconds" message.

  This is beyond horrible - the whole purpose of recovery mode is to fix
  errors like that, errors on partition which is not used to boot from
  (e. g. /home) should never ever break it. Alternatively you could add
  new mode to grub menu - smth like "recovery which actually works" or
  something like that.

  The workaround is to add 'break=premount' to grub command line and fix
  btrfs with 'btrfs check --repair /dev/dm-....' from initramfs.

  Found on xubuntu 15.04 x86_64.

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