Public bug reported:

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

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected natty

** Tags added: apport-collected natty

** Description changed:

  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.
+ 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

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

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

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