I'll investigate. Most probably bad exception processing.
fast/dom/setPrimitiveValue.html got fixed and expectations were cleaned up by http://trac.webkit.org/changeset/72280
fast/dom/setPrimitiveValue-exceptions.html is fine as well. r72404 removed suppression. Closing the bug. (In reply to comment #1) > fast/dom/setPrimitiveValue.html got fixed and expectations were cleaned up by http://trac.webkit.org/changeset/72280