[Webkit-unassigned] [Bug 244714] New: REGRESSION (253726 at main): [ macOS wk1 Debug ] ASSERTION FAILED: !needsLayout() WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244714

            Bug ID: 244714
           Summary: REGRESSION (253726 at main): [ macOS wk1 Debug ]
                    ASSERTION FAILED: !needsLayout()
                    WebCore::Widget::SecurityOriginPaintPolicy,
                    WebCore::EventRegionContext*)
           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:
imported/w3c/web-platform-tests/html/browsers/browsing-the-web/read-media/pageload-video.html is a flaky crash

The test consistently passed until the first flaky crash a saw on the dashboard at 246850 at main.  The test continues to flaky crash until, at 253726 at main, the frequency of flaky crashes increases significantly.  

REPRODUCTION STEPS
I can reproduce the flaky crash at 253726 at main but cannot reproduce it at 253725 at main or earlier.

Command: 
run-webkit-tests --debug -1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 --child-processes 1 --test-list <test-list attached>

Result: 
Unexpected flakiness: crashes (1)
  imported/w3c/web-platform-tests/html/browsers/browsing-the-web/read-media/pageload-video.html [ Pass Crash ]

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fbrowsers%2Fbrowsing-the-web%2Fread-media%2Fpageload-video.html&platform=mac&style=debug&flavor=wk1&limit=50000&recent=false

Crash Log:
Thread 0 Crashed::  
0   com.apple.JavaScriptCore                   0x121b68f4e    WTFCrash
1   com.apple.WebCore                          0x13153839a    WTFCrashWithInfo(int, char const*, char const*, int)
2   com.apple.WebCore                          0x135d7094e    WebCore::FrameView::paintContents(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*)
3   com.apple.WebKitLegacy                     0x1075c8a1c    -[WebFrame(WebInternal) _drawRect:contentsOnly:]
4   com.apple.WebKitLegacy                     0x1075ec9d2    -[WebHTMLView drawSingleRect:]
5   com.apple.WebKitLegacy                     0x1075ed034    -[WebHTMLView drawRect:]
6   com.apple.AppKit                           0x7ff80bec3280 _NSViewDrawRect + 120 (/AppleInternal/Library/BuildRoots/dd001be1-8f4d-11ec-b343-4a23b0182bfd/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit.subproj/NSView.m:992)
7   com.apple.AppKit                           0x7ff80c5de3bc -[NSView _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:] + 1826 (/AppleInternal/Library/BuildRoots/dd001be1-8f4d-11ec-b343-4a23b0182bfd/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit.subproj/NSView.m:16555)
8   com.apple.WebKitLegacy                     0x1075e07c6    -[WebHTMLView(WebPrivate) _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:]
9   com.apple.AppKit                           0x7ff80c5de70a -[NSView _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:] + 2672 (/AppleInternal/Library/BuildRoots/dd001be1-8f4d-11ec-b343-4a23b0182bfd/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit.subproj/NSView.m:16588)
10  com.apple.AppKit                           0x7ff80c5de70a -[NSView _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:] + 2672 (/AppleInternal/Library/BuildRoots/dd001be1-8f4d-11ec-b343-4a23b0182bfd/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit.subproj/NSView.m:16588)
11  com.apple.AppKit                           0x7ff80c5de70a -[NSView _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:] + 2672 (/AppleInternal/Library/BuildRoots/dd001be1-8f4d-11ec-b343-4a23b0182bfd/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit.subproj/NSView.m:16588)
12  com.apple.AppKit                           0x7ff80c033194 -[NSView displayRectIgnoringOpacity:inContext:] + 824 (/AppleInternal/Library/BuildRoots/dd001be1-8f4d-11ec-b343-4a23b0182bfd/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit.subproj/NSView.m:10319)
13  com.apple.WebCore                          0x133c3951c    WebCore::Widget::paint(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*)
14  com.apple.WebCore                          0x13602c482    WebCore::ScrollView::paint(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*)
15  com.apple.WebCore                          0x136b5a108    WebCore::RenderWidget::paintContents(WebCore::PaintInfo&, WebCore::LayoutPoint const&)
16  com.apple.WebCore                          0x136b5a9c2    WebCore::RenderWidget::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&)

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