Bug 172001 – [iOS Simulator] Flaky failure scrollingcoordinator/ios/sync-layer-positions-after-scroll.html

• Component: New Bugs
• Status: NEW

[Matt Lewis]

The test scrollingcoordinator/ios/sync-layer-positions-after-scroll.html is a flaky failure.

The last touch on this test was https://trac.webkit.org/changeset/212459/webkit

history
https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=scrollingcoordinator%2Fios%2Fsync-layer-positions-after-scroll.html
build
https://build.webkit.org/builders/Apple%20iOS%2010%20Simulator%20Release%20WK2%20(Tests)/builds/1365
https://build.webkit.org/results/Apple%20iOS%2010%20Simulator%20Release%20WK2%20(Tests)/r216695%20(1365)/results.html

Diff
--- /Volumes/Data/slave/ios-simulator-10-release-tests-wk2/build/layout-test-results/scrollingcoordinator/ios/sync-layer-positions-after-scroll-expected.txt
+++ /Volumes/Data/slave/ios-simulator-10-release-tests-wk2/build/layout-test-results/scrollingcoordinator/ios/sync-layer-positions-after-scroll-actual.txt
@@ -1,4 +1,4 @@
-visibleRectAfterScroll: {"left":0,"top":190,"width":320,"height":548}
+visibleRectAfterScroll: {"left":0,"top":0,"width":320,"height":548}
 (GraphicsLayer
   (anchor 0.00 0.00)
   (bounds 1308.00 2021.00)
@@ -9,7 +9,6 @@
       (children 1
         (GraphicsLayer
           (position 12.00 10.00)
-          (approximate position 12.00 200.00)
           (bounds 100.00 100.00)
           (contentsOpaque 1)
         )

[Alexey Proskuryakov]

This looks like the test is outright failing. Tim, Simon, should this be investigated soon?

[Shawn Roberts]

Test is still a flaky failure on iOS Simulator Release and Debug

Verified locally with :

run-webkit-tests scrollingcoordinator/ios/sync-layer-positions-after-scroll.html --ios-simulator --iter 100 -f --ios-simulator

about a 40% failure rate. The diff is different than listed in this bug originally. 

Diff:

--- /Users/shawnroberts/Desktop/builds/ios246499/layout-test-results/scrollingcoordinator/ios/sync-layer-positions-after-scroll-expected.txt
+++ /Users/shawnroberts/Desktop/builds/ios246499/layout-test-results/scrollingcoordinator/ios/sync-layer-positions-after-scroll-actual.txt
@@ -9,7 +9,7 @@
       (children 1
         (GraphicsLayer
           (position 12.00 10.00)
-          (approximate position 12.00 200.00)
+          (approximate position 12.00 166.50)
           (bounds 100.00 100.00)
           (contentsOpaque 1)
         )

[Radar WebKit Bug Importer]

<rdar://problem/51817513>

[Shawn Roberts]

Marked flaky in https://trac.webkit.org/changeset/246511/webkit

[Ryan Haddad]

New results history link: https://results.webkit.org/?suite=layout-tests&test=scrollingcoordinator%2Fios%2Fsync-layer-positions-after-scroll.html

This test is consistently failing for iPadOS simulator and a flaky failure on iOS simulator.

[Ryan Haddad]

The test fails multiple times per day on iOS simulator test runs.