compositing/color-matching/image-color-matching.html crashing intermittently This could be the same root cause as bug 28845, I'm not sure. I've only seen this once locally, as noted in: https://bugs.webkit.org/show_bug.cgi?id=29001#c10 But the bots have seen this a few times. Most recently: http://build.webkit.org/results/Leopard%20Intel%20Release%20(Tests)/r48611%20(5206)/results.html I don't have a crash report for you at the moment, but I can try running run-webkit-tests --iterations 100 compositing to see. This is possibly the same bug as bug 29035.