running the Mac WebKit port under NRWT (--worker-model=inline so that everything is run in a single DRT instance) or in ORWT, the first four tests in this file appear to be not cleaning up state properly, and are causing the last three tests to fail. It looks like deleting any of the first four tests will change which of the last four fail, so there's probably multiple things going on.
Created attachment 87952 [details] list of tests which will cause some of them to fail.
I will note that this is on Snow Leopard, by the way.
What revision are you synced to? http://trac.webkit.org/changeset/82741 fixed an uninitialized variable.
I think I was at 82763.