The following layout test is failing on GTK, Apple Lion and Apple Mountain Lion animations/cross-fade-background-image.html since it was turned into a reftest in r155100 <http://trac.webkit.org/changeset/155100>
See the results for GTK in http://build.webkit.org/results/GTK%20Linux%2064-bit%20Debug%20WK1/r155180%20%283996%29/results.html
Crashes in GTK since r246398:r246404