Bug 214133

Summary: [ iOS WK2 Release ] fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html is a flaky failure
Product: WebKit Reporter: Karl Rackler <rackler>
Component: New BugsAssignee: Simon Fraser (smfr) <simon.fraser>
Status: RESOLVED FIXED    
Severity: Normal CC: rackler, simon.fraser, tsavell, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Patch
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Description Karl Rackler 2020-07-09 05:53:48 PDT 
fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html

Description:
The test is flaky failing on iOS WK2 release. It has been flaky failing since introduced.
Introduced here: https://trac.webkit.org/changeset/264031/webkit

History: 
https://results.webkit.org/?suite=layout-tests&test=fast%2Fscrolling%2Fios%2Fnon-invertible-transformed-scroller-ancestor.html&platform=ios&style=release&flavor=wk2&limit=50000

Diff: 
--- /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/fast/scrolling/ios/non-invertible-transformed-scroller-ancestor-expected.txt
+++ /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/fast/scrolling/ios/non-invertible-transformed-scroller-ancestor-actual.txt
@@ -3,7 +3,7 @@
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS windowScrollTop > 0 is true
+FAIL windowScrollTop > 0 should be true. Was false.
 PASS overflowScrollTop is 0
 PASS successfullyParsed is true
Comment 1 Radar WebKit Bug Importer 2020-07-09 05:54:09 PDT 
<rdar://problem/65268636>
Comment 2 Karl Rackler 2020-07-10 09:32:46 PDT 
I can reproduce this on r264133 and r264025.
The regression introduction appears to be: r264025

Command: 
run-webkit-tests --ios-simulator --iterations 500 --exit-after-n-failures 3 --force -f fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html

Result: 
[5/500] fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html failed unexpectedly (text diff)
[5/500] fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html failed unexpectedly (text diff)
[5/500] fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html failed unexpectedly (text diff)
Exiting early after 3 failures. 3 tests run.


0 tests ran as expected, 3 didn't (497 didn't run):


Regressions: Unexpected text-only failures (1)
  fast/scrolling/ios/non-invertible-transformed-scroller-ancestor.html [ Failure ]
Comment 3 Karl Rackler 2020-07-13 08:05:44 PDT 
Created attachment 404146 [details]
Patch
Comment 4 Karl Rackler 2020-07-13 08:08:13 PDT 
I have marked this test as flaky failing while the issue is investigated.
Comment 5 Truitt Savell 2020-07-13 08:17:18 PDT 
This test was added in https://trac.webkit.org/changeset/264031/webkit
Comment 6 EWS 2020-07-13 08:39:58 PDT 
Committed r264302: <https://trac.webkit.org/changeset/264302>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 404146 [details].
Comment 7 Truitt Savell 2020-07-13 09:04:22 PDT 
Reopen because this was only an expectations change
Comment 8 Simon Fraser (smfr) 2020-07-15 20:54:20 PDT 
Created attachment 404418 [details]
Patch
Comment 9 Simon Fraser (smfr) 2020-07-15 20:56:01 PDT 
https://trac.webkit.org/changeset/264445/webkit