Fedora's livecd-tools has this nifty "livecd-to-pxeboot" script for turning a bootable iso into a pxebootable image by putting the iso inside of the initrd. After playing with this for a bit and creating a small pxebootable distribution (using cobbler to manage it naturally), I ran into this bug. Since this is a stateless pxebootable distribution, there isn't a kickstart tree.
When replicating from 1 cobbler instance to another, it was blowing up. The traceback was relatively simple and the bug existed in master as well as 2.0.11, so I wrote patches for both.