206296 2020-01-15 10:17:17 -0800 REGRESSION (r252205?): [ Mac wk2 ] tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html became very flaky 2020-01-21 23:41:40 -0800 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 tsavell simon.fraser commit-queue rniwa simon.fraser webkit-bot-watchers-bugzilla webkit-bug-importer oldest_to_newest 1606976 0 tsavell 2020-01-15 10:17:17 -0800 tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html Description: This test has been flaky for a while, history first shows failures starting around r251229. History: https://results.webkit.org/?suite=layout-tests&test=tiled-drawing%2Fscrolling%2Ffast-scroll-select-latched-mainframe-with-handler.html&limit=23718 Diff: --- /Volumes/Data/slave/catalina-debug-tests-wk2/build/layout-test-results/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler-expected.txt +++ /Volumes/Data/slave/catalina-debug-tests-wk2/build/layout-test-results/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler-actual.txt @@ -14,15 +14,15 @@ (GraphicsLayer (anchor 0.00 0.00) (bounds 2008.00 2266.00) - (visible rect 0.00, 70.00 785.00 x 585.00) - (coverage rect 0.00, 70.00 785.00 x 585.00) + (visible rect 0.00, 0.00 785.00 x 585.00) + (coverage rect 0.00, 0.00 785.00 x 585.00) (intersects coverage rect 1) (contentsScale 1.00) (children 1 (GraphicsLayer (bounds 2008.00 2266.00) (contentsOpaque 1) - (visible rect 0.00, 70.00 785.00 x 585.00) + (visible rect 0.00, 0.00 785.00 x 585.00) (coverage rect 0.00, 0.00 1570.00 x 1755.00) (intersects coverage rect 1) (contentsScale 1.00) 1606977 1 webkit-bug-importer 2020-01-15 10:17:34 -0800 <rdar://problem/58609558> 1606994 2 tsavell 2020-01-15 10:46:45 -0800 This reproduces by running the test in iterations. 1607001 3 tsavell 2020-01-15 10:49:25 -0800 I am able to reproduce this on ToT and as far back as r251002, so I am unsure where this really regressed 1607011 4 tsavell 2020-01-15 10:59:12 -0800 Marking test as failing on Mac Debug wk2 while this is investigated: https://trac.webkit.org/changeset/254577/webkit 1607361 5 ap 2020-01-15 22:48:45 -0800 This test was failing rarely intake November 7th, when it turned into a very frequent failure. r252205 seems like a very likely culprit. 1607362 6 ap 2020-01-15 22:49:38 -0800 > was failing rarely intake November 7th until November 7th 1607369 7 rniwa 2020-01-15 23:01:02 -0800 That seems like a reasonable assessment to me. 1608336 8 388124 simon.fraser 2020-01-17 18:06:24 -0800 Created attachment 388124 Patch 1608350 9 388124 rniwa 2020-01-17 18:59:27 -0800 Comment on attachment 388124 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=388124&action=review > LayoutTests/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html:69 > + eventSender.callAfterScrollingCompletes(checkForScroll); We should probably wait for requestAnimationFrame after callAfterScrollingCompletes. 1608378 10 simon.fraser 2020-01-17 22:38:06 -0800 (In reply to Ryosuke Niwa from comment #9) > Comment on attachment 388124 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=388124&action=review > > > LayoutTests/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html:69 > > + eventSender.callAfterScrollingCompletes(checkForScroll); > > We should probably wait for requestAnimationFrame after > callAfterScrollingCompletes. Ideally eventSender.callAfterScrollingCompletes() would do that internally. 1608388 11 388124 rniwa 2020-01-17 23:03:53 -0800 Comment on attachment 388124 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=388124&action=review >>> LayoutTests/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html:69 >>> + eventSender.callAfterScrollingCompletes(checkForScroll); >> >> We should probably wait for requestAnimationFrame after callAfterScrollingCompletes. > > Ideally eventSender.callAfterScrollingCompletes() would do that internally. But does it? 1608398 12 388124 commit-queue 2020-01-17 23:21:58 -0800 Comment on attachment 388124 Patch Clearing flags on attachment: 388124 Committed r254793: <https://trac.webkit.org/changeset/254793> 1608399 13 commit-queue 2020-01-17 23:22:00 -0800 All reviewed patches have been landed. Closing bug. 1609156 14 simon.fraser 2020-01-21 11:27:51 -0800 (In reply to Ryosuke Niwa from comment #11) > Comment on attachment 388124 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=388124&action=review > > >>> LayoutTests/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html:69 > >>> + eventSender.callAfterScrollingCompletes(checkForScroll); > >> > >> We should probably wait for requestAnimationFrame after callAfterScrollingCompletes. > > > > Ideally eventSender.callAfterScrollingCompletes() would do that internally. > > But does it? No. But we shouldn't need to wait for rAF; DRT and WTR call Page::updateRendering() when tests complete. 1609471 15 rniwa 2020-01-21 23:41:40 -0800 (In reply to Simon Fraser (smfr) from comment #14) > (In reply to Ryosuke Niwa from comment #11) > > Comment on attachment 388124 [details] > > Patch > > > > View in context: > > https://bugs.webkit.org/attachment.cgi?id=388124&action=review > > > > >>> LayoutTests/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-with-handler.html:69 > > >>> + eventSender.callAfterScrollingCompletes(checkForScroll); > > >> > > >> We should probably wait for requestAnimationFrame after callAfterScrollingCompletes. > > > > > > Ideally eventSender.callAfterScrollingCompletes() would do that internally. > > > > But does it? > > No. But we shouldn't need to wait for rAF; DRT and WTR call > Page::updateRendering() when tests complete. 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