TestWebKitAPI.WebAuthenticationPanel.PanelHidSuccess2 is failing consistently. e.g.: https://ews-build.webkit.org/#/builders/9/builds/10718
It was added yesterday in https://trac.webkit.org/changeset/251498/webkit
Doesn't quite fail 100% of the time <https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.WebAuthenticationPanel.PanelHidSuccess2>, but yeah, it's super flakey.
<rdar://problem/56593108>
*** This bug has been marked as a duplicate of bug 202561 ***