We just crash, but without knowing the details about the message it's impossible to debug.
Created attachment 306284 [details]
Technically it needs an owner
(In reply to Michael Catanzaro from comment #2)
> Technically it needs an owner
No, it's ifdefed code.
Comment on attachment 306284 [details]
Clearing flags on attachment: 306284
Committed r214947: <http://trac.webkit.org/changeset/214947>
All reviewed patches have been landed. Closing bug.