[Bug 748340] Re: btrfsck fails with "unsupported option features", must [ignore] to boot

[arand]

@John Lewis
I think compression cannot be an exclusive cause of the issue, seeing how me and whakim have not touched compression and are seing this.
What does the btrfsck tool from debian unstable report in your case with you compression setup, I would assume this might be different?
It could be that there are several issues all reporting the same nondescript error.

Compression would be a very logical explanation though, if the userspace
fsck is simply outdated compared to the kernel btrfs code.

I still maintain that enabling btrfsck at all was a big mistake... I was
never meant to be used like this.

...I wonder if it wold be possible to reproduce this error using only
snapshots and balancing, since that would explain the non-compression
cases...

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https://bugs.launchpad.net/bugs/748340

Title:
  btrfsck fails with "unsupported option features", must [ignore] to
  boot

Status in “btrfs-tools” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: btrfs-tools

  current btrfsck on natty reports:
  couldn't open because of unsupported option features (2).
  fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
  ...if invoked on the standard root/home.

  Meaning that when the link fsck.btrfs -> btrfsck was enabled as per Bug #660649 my system now stops booting with this message:
  fsck from util-linux-ng 2.17.2
  fsck from util-linux-ng 2.17.2
  fsck from util-linux-ng 2.17.2
  couldn't open because of unsupported option features (2).
  fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
  Warning... fsck.btrfs for device /dev/sda5 exited with signal 6.
  mountall: fsck /home [313] terminated with status 8
  mountall: Unrecoverable fsck error: /home
  couldn't open because of unsupported option features (2).
  fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
  Warning... fsck.btrfs for device /dev/sda5 exited with signal 6.
  mountall: fsck / [312] terminated with status 8
  mountall: Unrecoverable fsck error: /
  /dev/sda1: clean, 233/48768 files, 44709/194560 blocks
  init: udev-fallback-graphics main process (625) terminated with status 1

  If [I] is pressed to ignore errors booting can be done normally, just bypassing btrfsck completely.
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 11.04
  Package: btrfs-tools 0.19+20100601-3ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_GB.UTF-8
   LANGUAGE=en_GB:en
  ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
  Tags:  natty
  Uname: Linux 2.6.38-7-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare