http://build.webkit.org/results/Apple%20Lion%20Release%20WK2%20(Tests)/r145717%20(8825)/results.html shows a failure of svg/filters/feDisplacementMap-filterUnits.svg
Not sure when this started.
Looks like failure range is between http://trac.webkit.org/changeset/145581 and http://trac.webkit.org/changeset/145593 but nothing in that range looks relevant.
Actually this is failing at r145057 and earlier.
Does it fail in 10.9 as well?
It fails on all platforms
...maybe only on Retina though.