The following layout test crashed once: js/dom/global-recursion-on-full-stack.html See here: https://build.webkit.org/results/Apple%20Yosemite%20Debug%20WK2%20(Tests)/r188764%20(6445)/js/dom/global-recursion-on-full-stack-crash-log.txt
This was observed here: https://build.webkit.org/builders/Apple%20Yosemite%20Debug%20WK2%20%28Tests%29/builds/6445 That's after this landed: https://trac.webkit.org/changeset/188764. Not sure it's related or not.