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?