[Bug 1451265] Re: dirty reboot always results in unbootable system if root is btrfs

[Arnaud]

Same here with 15.04, happen regularly has video driver tends to crash (but that's another story)
recovery mode does not work, I reboot in 'initramfs mode' by removing the param of the boot line and use btrfs-zero-log to fix it (or btrfs check --repair, but it did not fix the issue once)
Sometime for / sometimes for /home 
Never happened once with 14.04

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Title:
  dirty reboot always results in unbootable system if root is btrfs

Status in btrfs-tools package in Ubuntu:
  Confirmed

Bug description:
  Probably it is not a btrfs-tool bug but it is a btrfs related one.
  I'm using btrfs as my rootfs in 15.04. Whenever I do a dirty reboot (power outage, sysrq-reboot, etc...) ubuntu is not bootable anymore. Ubuntu splash is kept in loop forever but Ctrl+alt+del works. The only workaround I found is to reboot in a livecd and do a 

  btrfs check --repair /dev/sda6 (my rootfs)

  Which seems to undo part of what was changed in fs (including logs).

  Is there any better way to debug this?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: btrfs-tools 3.17-1.1
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  NonfreeKernelModules: fglrx wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun May  3 18:32:42 2015
  SourcePackage: btrfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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