Bug 172001 - [iOS Simulator] Flaky failure scrollingcoordinator/ios/sync-layer-positions-after-scroll.html
Summary: [iOS Simulator] Flaky failure scrollingcoordinator/ios/sync-layer-positions-a...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: New Bugs (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2017-05-11 16:42 PDT by Matt Lewis
Modified: 2020-04-06 21:13 PDT (History)
5 users (show)

See Also:


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Description Matt Lewis 2017-05-11 16:42:27 PDT
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)
         )
Comment 1 Alexey Proskuryakov 2017-05-14 13:28:26 PDT
This looks like the test is outright failing. Tim, Simon, should this be investigated soon?
Comment 2 Shawn Roberts 2019-06-17 13:09:12 PDT
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)
         )
Comment 3 Radar WebKit Bug Importer 2019-06-17 13:09:28 PDT
<rdar://problem/51817513>
Comment 4 Shawn Roberts 2019-06-17 13:14:26 PDT
Marked flaky in https://trac.webkit.org/changeset/246511/webkit
Comment 5 Ryan Haddad 2020-04-06 21:11:42 PDT
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.
Comment 6 Ryan Haddad 2020-04-06 21:13:31 PDT
The test fails multiple times per day on iOS simulator test runs.