API test TestWebKitAPI.WebAuthenticationPanel.SubFrameDestructionHidCancel is consistently timing out on EWS bots which are on Catalina 10.15.1 (19B88). It passes on EWS bots which are on Mojave and on build.webkit.org bots which are on 10.15 (19A603). e.g.: https://ews-build.webkit.org/#/builders/9/builds/11629 https://ews-build.webkit.org/#/builders/9/builds/11622 https://ews-build.webkit.org/#/builders/9/builds/11616 The test was added in http://trac.webkit.org/changeset/251295/webkit 3 weeks ago.
<rdar://problem/56980982>
The tests look quite healthy on: https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.WebAuthenticationPanel.SubFrameDestructionHidCancel
It was due to a configuration issue which started happening after updating the bots to Catalina. Sorry for the noise.