3.14.2 Debian kernel BTRFS corruption after balance

Last night my cron job that runs "/sbin/btrfs fi balance start -dusage=30 - musage=30 /" failed with no space for balancing. Then I manually ran it to free space for further balancing and ended up running -musage=0 -dusage=60 (dusage=40 resulted in nothing being done).

http://www.coker.com.au/bug/btrfs-3.14.2-dmesg.txt.gz

After running the dusage=60 balance I had a kernel panic apparently due to a corrupted filesystem, the above URL has the dmesg.

http://www.coker.com.au/bug/btrfs-3.14.2-dmesg2.txt.gz

Then I rebooted the system and got the above error. It now seems impossible to get a read-write filesystem. I'll try booting with the latest Debian kernel (3.14.4) and see if that makes it work. Otherwise I guess it's backup/format/restore.

Would it be worth keeping an image of that filesystem to see if a newer kernel can handle it better?

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