This directory used to contain diffs between openjdk bxx and bxx+1 drops.
These days there is a readonly mercurial mirror setup that you can clone
with tags for each bxx for easy diffing yourself:

$ hg clone http://icedtea.classpath.org/hg/openjdk6

The jtreg/ directory contains results from running make check on IcedTea6.

Happy Hacking!
Mark