http://trac.webkit.org/changeset/84148 I am not positively sure because the crashes are flakey, but the crashes seem to start around that revision: http://build.webkit.org/results/Windows%207%20Release%20(WebKit2%20Tests)/r84147%20(5631)/results.html http://build.webkit.org/results/Windows%207%20Release%20(WebKit2%20Tests)/r84149%20(5633)/results.html http://build.webkit.org/results/Windows%207%20Release%20(WebKit2%20Tests)/r84251%20(5681)/inspector/styles/up-down-numerics-and-colors-crash-log.txt
This does not seem to have been crashing lately.