http://build.webkit.org/results/Windows%20XP%20Debug%20(Tests)/r73717%20(23363)/fast/canvas/set-colors-pretty-diff.html I do not know when it started failing (webkit-patch failure-reason was giving only error outputl). It has been failing at least since r73712, but all the changes since r73706 (the last time the Windows XP Debug Tests bot was green) do not seem like they would have caused this regression.
This seems to only be happening on the apple-windows-13 slave. Maybe there's something wrong with that slave?
<rdar://problem/8908383>
http://build.webkit.org/results/Windows%20XP%20Debug%20(Tests)/r76655%20(24544)/results.html Looks like fast/canvas/set-colors.html is no longer failing on apple-windows-13. Closing.