[Webkit-unassigned] [Bug 217001] New: REGRESSION (r266932): [ Catalina wk2 ] fast/scrolling/latching/latched-scroll-into-nonfast-region.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217001

            Bug ID: 217001
           Summary: REGRESSION (r266932): [ Catalina wk2 ]
                    fast/scrolling/latching/latched-scroll-into-nonfast-re
                    gion.html is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
fast/scrolling/latching/latched-scroll-into-nonfast-region.html

The first failure that I see this on the dashboard was 09/03/20 at r266538 on Catalina debug wk2.  It has had a frequency of approximately every 4 days, but on 09/16/20 increased in frequency to daily occurrences. 

I can reproduce this on r266932, but unable to reproduce on r266931.
Commit r266932 has to do with MediaToolboxSoftLink.cpp and MediaToolboxSoftLink.h, which could have introduced the flakiness.  The change was introduced here https://trac.webkit.org/changeset/266932/webkit.

REPRODUCTION STEPS
Command: 
run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f fast/scrolling/latching/latched-scroll-into-nonfast-region.html

Result: 
Regressions: Unexpected text-only failures (1)
  fast/scrolling/latching/latched-scroll-into-nonfast-region.html [ Failure ]

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fscrolling%2Flatching%2Flatched-scroll-into-nonfast-region.html&limit=50000&version_name=Catalina&flavor=wk2

Diff Log:
--- /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/fast/scrolling/latching/latched-scroll-into-nonfast-region-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/fast/scrolling/latching/latched-scroll-into-nonfast-region-actual.txt
@@ -4,7 +4,7 @@


 Scrolling the main frame with latching
-PASS wheelEventHandlerCount is 0
+FAIL wheelEventHandlerCount should be 0. Was 3.
 PASS successfullyParsed is true

 TEST COMPLETE

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