This is another crash pattern we are seeing after the Webkit 620 update. It doesn't seem to be related to JDK-8347937 as the run with jni check option shows no problem. The crash happens during the regression test test.javafx.scene.web.LeakTest on win32 and macosx (x86_64) platforms.

I've listed jfx25 as the affected version, but actually all LTS suffer from the same problem.