We eventually hit the ASSERT_NOT_REACHED in WebAnimation::timeToNextTick with the following command: run-webkit-tests --debug animations/stacking-context-not-fill-forwards.html --iterations=1000 --exit-after-n-failures=1
<rdar://problem/46520059>
Created attachment 365664 [details] Patch
Comment on attachment 365664 [details] Patch Where is the test?
(In reply to Dean Jackson from comment #3) > Comment on attachment 365664 [details] > Patch > > Where is the test? The API itself wouldn’t let you input a value close enough to the boundary to be within the epsilon because they get rounded to the nearest millisecond. We'll know this issue is fixed as this caused crashes in Debug builds for a number of tests, this should now go down to 0.
Comment on attachment 365664 [details] Patch Clearing flags on attachment: 365664 Committed r243374: <https://trac.webkit.org/changeset/243374>
All reviewed patches have been landed. Closing bug.