There have been discussions on bugtraq about being able to
crash some bind-9.1.0 installations with nmap.
This is (at least partially) due to some assertion failures.
This has been fixed in bind-9.1.1rc1, among other nasty bugs.
.. Starting to run out of time though ..
That's part of why I've pushed 9.1.1rc1 into the 7.1 tree about 13 hours ago. ;)