The following layout test is failing on all debug platforms: fast/dom/gc-dom-tree-lifetime.html Probable cause: Not sure what the root cause is. I will try to mark it as slow for now.
Slow annotation added in http://trac.webkit.org/changeset/130649
It helped: the test takes around 20s to run in Debug :(
Adding slow only made the test time out less. It remove the flakiness so it's not slow after http://trac.webkit.org/changeset/130964
This test is no longer particularly slow. Closing.