Bug 120922 – compositing/overlap-blending/children-opacity-huge.html and children-opacity-no-overlap.html are failing

• Status: NEW
• Component: Layout and Rendering

[Ryosuke Niwa]

http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK1%20(Tests)/r155235%20(12619)/results.html
http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=compositing%2Foverlap-blending%2Fchildren-opacity-huge.html%2Ccompositing%2Foverlap-blending%2Fchildren-opacity-no-overlap.html

It seems like we've introduced some nondeterministic behavior in WebKit.  Random compositing tests are failing on each run.  This is bad.  It's going to clog EWS and Commit Queue completely.

[Ryosuke Niwa]

Committed r155237: <http://trac.webkit.org/changeset/155237>

[Simon Fraser (smfr)]

Did it start with http://trac.webkit.org/changeset/155140 ?

[Ryosuke Niwa]

(In reply to comment #2)
> Did it start with http://trac.webkit.org/changeset/155140 ?

It's hard to tell.  Because there is no single test that has been failing.
http://build.webkit.org/builders/Apple%20MountainLion%20Release%20WK2%20%28Tests%29?numbuilds=100

[Ryosuke Niwa]

It seems like media/video-object-fit.html started failing after that patch on Lion:
http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=media%2Fvideo-object-fit.html

[Ryosuke Niwa]

EWS seems to indicate something bad happened about 10 hours ago.

[Simon Fraser (smfr)]

That would implicate http://trac.webkit.org/changeset/155196

[Ryosuke Niwa]

(In reply to comment #6)
> That would implicate http://trac.webkit.org/changeset/155196

I've rolled that change out in http://trac.webkit.org/changeset/155235 but that change was in response to EWS getting behind so the underlying issue must be somewhere else.

[Alexey Proskuryakov]

These two tests are failing for me locally with r155076.