http://build.webkit.org/results/Qt%20Linux%20Release/r52956%20(5713)/results.html Reportedly, this started with my commit <http://trac.webkit.org/changeset/52956>, but I don't know what could be causing these crashes, and don't have a Qt build to debug them.
Crashed caused by imperfect Qt build system. r52956 is good after clean build. Thx for the report.