Unable to boot btrfs filesystem, and btrfsck aborts

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My laptop crashed hard earlier today. It reset immediately to a black
screen followed by the BIOS. I have no idea why.

However, it now fails to boot. I took a picture of the kernel panic
that results from trying to mount the root filesystem:
https://plus.google.com/107763699965053810188/posts/QZZt7GYzBZi

To make things worse, btrfsck aborts with a double free, without
fixing it. I took a picture of that, too:
https://plus.google.com/107763699965053810188/posts/gKYqGgFhWyT

As the kernel panic mentions btrfs_remove_free_space, I also tried
mounting with clear_cache. Unfortunately it didn't dislodge anything.

This is on a fully updated Fedora 18 system. I would really like to
get this data back. If anybody could offer a suggestion I'd be very
grateful.

Thanks,

Matt
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