On Thu, Feb 09, 2012 at 06:54:42PM -0600, Chester wrote:

Output for btrfs-debug-tree for that specific block in dmesg

And available here ( http://pastebin.com/AgdvS5JM ) in case the lines
wrap and look ugly

Ok, good news.  This bad block is in the extent allocation tree, which
means it is easy to replace.

Is it possible for you to make a block level backup of this disk?  That
way we can experiment a little and fix it up.

Either way, I'll recreate this corruption here in the morning and patch
fsck to fix it.

-chris