Since this would happen after the 2 billionth timer fire this is unlikely, and consequences aren't severe (breaks throttling).
Created attachment 237395 [details] Fix
Comment on attachment 237395 [details] Fix Not related to this patch, but looks like we have a thread safety issue with nestingLevel and workers.
Transmitting file data .. Committed revision 173132.
(In reply to comment #2) > (From update of attachment 237395 [details]) > Not related to this patch, but looks like we have a thread safety issue with nestingLevel and workers. Good point! Fixed in: https://bugs.webkit.org/show_bug.cgi?id=136401