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

[Markus Majer]

Just wait for Ubuntu 15.10 - there is BtrFS V4.* included - which is a
huge improvement over BtrFS V3.* - all stuff should work a bit
smoother..

Btw I dont have to boot from a Live CD, all tools are available in the
busybox already - where you get after entering the crypt password, if
the partition doesnt boot.

In the meantime: The check --repair works every time for me that it
happpens.

It happend 3 times, my system hangs when some VMs make problems and only
this helped back then because they deactivated the Magic SysReq Key
Sequence (https://en.wikipedia.org/wiki/Magic_SysRq_key) partially.

(REISUB only works partially in Ubuntu, I didnt knew until I read it
somewhere..)

So, I reactivated the Sequence - now the hangups doesnt make problems
anymore as it seems. Maybe thats a compromise until the next Ubuntu
release

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https://bugs.launchpad.net/bugs/1451265

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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