We should be taking a stack trace from the stack overflowed callee's caller.
Created attachment 279082 [details] patch
The EWS says that the test is timing out. Maybe you should add a TestExpectation to skip it for debug builds.
Created attachment 279092 [details] patch for landing
Comment on attachment 279092 [details] patch for landing Clearing flags on attachment: 279092 Committed r200997: <http://trac.webkit.org/changeset/200997>
All reviewed patches have been landed. Closing bug.