[Bug 793410] Re: btrfsck assert failure: btrfsck: disk-io.c:416: find_and_setup_root: Assertion `!(!root->node)' failed.

[Carey Underwood]

Btrfsck is not a repair tool; 2.6.38 has known corruption issues, and
btrfs itself is still considered experimental in 3.3rc3, let alone
2.6.38.

That said, the data is almost certainly fine, so long as you don't go
poking at random utilities without instruction from somebody who knows
what they're doing (which means the btrfs mailing list).

Easiest first thing to try is installing a 3.2 or 3.3 kernel and attempt
to mount the filesystem readonly.

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Title:
  btrfsck assert failure: btrfsck: disk-io.c:416: find_and_setup_root:
  Assertion `!(!root->node)' failed.

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

Bug description:
  Binary package hint: btrfs-tools

  not sure if it's a hdd problem or not, but the FS is a goner :-(

  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: btrfs-tools 0.19+20100601-3ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  Architecture: amd64
  AssertionMessage: btrfsck: disk-io.c:416: find_and_setup_root: Assertion `!(!root->node)' failed.
  Date: Mon Jun  6 08:40:05 2011
  ExecutablePath: /sbin/btrfsck
  LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcCmdline: btrfsck /dev/sda3
  ProcEnviron:
   SHELL=/bin/bash
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   LANGUAGE=en_US:en
  Signal: 6
  SourcePackage: btrfs-tools
  StacktraceTop:
   raise () from /lib/x86_64-linux-gnu/libc.so.6
   abort () from /lib/x86_64-linux-gnu/libc.so.6
   __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
   ?? ()
   ?? ()
  Title: btrfsck assert failure: btrfsck: disk-io.c:416: find_and_setup_root: Assertion `!(!root->node)' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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