Btrfs devel - Mar 2014 - Another crash when deleting a large number of snapshots

This kind of crashes happens me very often when I delete a large
number (+200) of snapshots at once.
There is a very high IO for a while, and after that, the system
freezed at intervals. I had to reboot the system to get it responsive
again.

Versions used:
kernel-3.13.6-200.fc20.x86_64
btrfs-progs-3.12-1.fc20.x86_64

The log:
http://ur1.ca/gvr3j
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