From Klaus on the unionfs mailing list http://www.fsl.cs.sunysb.edu/piperma...er/001110.html :
Congratulations, it seems that you have just solved a LOT of the unionfs-related problems. I had in Knoppix (especially when overwriting files multiple times, which was probably just a problem with whiteout filename generation that was affected by the wrong kmalloc). Some bugs are still pending, but at least now it looks like I can make a new release this week.