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<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>224910</bug_id>
          
          <creation_ts>2021-04-21 19:15:40 -0700</creation_ts>
          <short_desc>REGRESSION (r276377): [ iOS, EWS ] scrollingcoordinator/ios/fixed-inside-sticky-no-stacking-context-2.html is a constant Image Failure</short_desc>
          <delta_ts>2021-04-28 08:45:09 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Scrolling</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Robert Jenner">jenner</reporter>
          <assigned_to name="Tim Nguyen (:ntim)">ntim</assigned_to>
          <cc>don.olmstead</cc>
    
    <cc>koivisto</cc>
    
    <cc>mrobinson</cc>
    
    <cc>ntim</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>webkit-bot-watchers-bugzilla</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1753007</commentid>
    <comment_count>0</comment_count>
    <who name="Robert Jenner">jenner</who>
    <bug_when>2021-04-21 19:15:40 -0700</bug_when>
    <thetext>scrollingcoordinator/ios/fixed-inside-sticky-no-stacking-context-2.html

is a constant Image failure on iOS, and is slowing down EWS queues. 

WEBKIT RESULTS HISTORY:
https://results.webkit.org/?suite=layout-tests&amp;test=scrollingcoordinator%2Fios%2Ffixed-inside-sticky-no-stacking-context-2.html

EWS FAILURE:
https://ews-build.s3-us-west-2.amazonaws.com/iOS-14-Simulator-WK2-Tests-EWS/r426730-11881/results.html

IMAGE DIFF LINK:
https://build.webkit.org/results/Apple-iOS-14-Simulator-Release-WK2-Tests/r276393%20(1090)/scrollingcoordinator/ios/fixed-inside-sticky-no-stacking-context-2-diffs.html

Diff images are also attached to this bug below.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1753008</commentid>
    <comment_count>1</comment_count>
      <attachid>426764</attachid>
    <who name="Robert Jenner">jenner</who>
    <bug_when>2021-04-21 19:16:53 -0700</bug_when>
    <thetext>Created attachment 426764
Expected, Actual, and Diff images for failing test.

Attaching images to this bug.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1753010</commentid>
    <comment_count>2</comment_count>
    <who name="Robert Jenner">jenner</who>
    <bug_when>2021-04-21 19:28:23 -0700</bug_when>
    <thetext>Updated test expectations to Failure here to speed up EWS:
https://trac.webkit.org/changeset/276416/webkit</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1753012</commentid>
    <comment_count>3</comment_count>
    <who name="Robert Jenner">jenner</who>
    <bug_when>2021-04-21 19:46:06 -0700</bug_when>
    <thetext>Was able to reproduce the failure on iOS14 Simulator Release ToT using the following test:

run-webkit-tests --ios-simulator scrollingcoordinator/ios/fixed-inside-sticky-no-stacking-context-2.html -f

There are a lot of revisions that did not get built, so I&apos;m not able to verify a regression point. However, it appears that changes to Scroll Snap at r276382 is the likely cause of the test&apos;s failure:
https://trac.webkit.org/changeset/276382/webkit</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1753013</commentid>
    <comment_count>4</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2021-04-21 19:51:23 -0700</bug_when>
    <thetext>&lt;rdar://problem/76995693&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1753181</commentid>
    <comment_count>5</comment_count>
    <who name="Martin Robinson">mrobinson</who>
    <bug_when>2021-04-22 08:49:45 -0700</bug_when>
    <thetext>I took a look at this and I think the culprit here might be r276377. The test starts passing after reverting that commit, but not after reverting r276382.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1753296</commentid>
    <comment_count>6</comment_count>
    <who name="Ryan Haddad">ryanhaddad</who>
    <bug_when>2021-04-22 14:13:42 -0700</bug_when>
    <thetext>(In reply to Martin Robinson from comment #5)
&gt; I took a look at this and I think the culprit here might be r276377. The
&gt; test starts passing after reverting that commit, but not after reverting
&gt; r276382.
Thanks for looking! I see the test uses &quot;will-change: transform&quot;, so that is likely.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1754937</commentid>
    <comment_count>7</comment_count>
      <attachid>427242</attachid>
    <who name="Tim Nguyen (:ntim)">ntim</who>
    <bug_when>2021-04-28 00:04:47 -0700</bug_when>
    <thetext>Created attachment 427242
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1754994</commentid>
    <comment_count>8</comment_count>
      <attachid>427254</attachid>
    <who name="Tim Nguyen (:ntim)">ntim</who>
    <bug_when>2021-04-28 05:47:02 -0700</bug_when>
    <thetext>Created attachment 427254
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1755037</commentid>
    <comment_count>9</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2021-04-28 08:45:07 -0700</bug_when>
    <thetext>Committed r276716 (237120@main): &lt;https://commits.webkit.org/237120@main&gt;

All reviewed patches have been landed. Closing bug and clearing flags on attachment 427254.</thetext>
  </long_desc>
      
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            <desc>Expected, Actual, and Diff images for failing test.</desc>
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            <date>2021-04-28 00:04:47 -0700</date>
            <delta_ts>2021-04-28 05:46:58 -0700</delta_ts>
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            <type>text/plain</type>
            <size>2503</size>
            <attacher name="Tim Nguyen (:ntim)">ntim</attacher>
            
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            <date>2021-04-28 05:47:02 -0700</date>
            <delta_ts>2021-04-28 08:45:08 -0700</delta_ts>
            <desc>Patch</desc>
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            <type>text/plain</type>
            <size>3356</size>
            <attacher name="Tim Nguyen (:ntim)">ntim</attacher>
            
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