[Webkit-unassigned] [Bug 209668] New: REGRESSION: [ Mac wk2 Release ] media/modern-media-controls/seek-backward-support/seek-backward-support.html is flaky crashing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209668

            Bug ID: 209668
           Summary: REGRESSION: [ Mac wk2 Release ]
                    media/modern-media-controls/seek-backward-support/seek
                    -backward-support.html is flaky crashing.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Lawrence.j at apple.com

media/modern-media-controls/seek-backward-support/seek-backward-support.html

Description:
This test is flaky crashing on Mac wk2 Release.
History:
https://results.webkit.org/?suite=layout-tests&test=media%2Fmodern-media-controls%2Fseek-backward-support%2Fseek-backward-support.html&style=release&flavor=wk2

Crash log;
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore                   0x000000054324dd79 WebCore::MediaPlayer::createVideoFullscreenLayer() + 9 (MediaPlayer.cpp:762)
1   com.apple.WebCore                   0x0000000542de59a5 WebCore::HTMLMediaElement::createVideoFullscreenLayer() + 21 (HTMLMediaElement.cpp:6251)
2   com.apple.WebCore                   0x000000054253cf12 WebCore::VideoFullscreenModelVideoElement::createVideoFullscreenLayer() + 18 (VideoFullscreenModelVideoElement.mm:115)
3   com.apple.WebKit                    0x000000054045f03f WebKit::VideoFullscreenManager::enterVideoFullscreenForVideoElement(WebCore::HTMLVideoElement&, unsigned int, bool) + 387 (VideoFullscreenManager.mm:275)
4   libdispatch.dylib                   0x00007fff706376c4 _dispatch_call_block_and_release + 12
5   libdispatch.dylib                   0x00007fff70638658 _dispatch_client_callout + 8
6   libdispatch.dylib                   0x00007fff70643cab _dispatch_main_queue_callback_4CF + 936
7   com.apple.CoreFoundation            0x00007fff36789041 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
8   com.apple.CoreFoundation            0x00007fff36748e47 __CFRunLoopRun + 2028
9   com.apple.CoreFoundation            0x00007fff36747ffe CFRunLoopRunSpecific + 462
10  com.apple.Foundation                0x00007fff38ddc2a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
11  com.apple.Foundation                0x00007fff38e8ed2f -[NSRunLoop(NSRunLoop) run] + 76
12  libxpc.dylib                        0x00007fff708df51a _xpc_objc_main.cold.4 + 49
13  libxpc.dylib                        0x00007fff708df460 _xpc_objc_main + 559
14  libxpc.dylib                        0x00007fff708def93 xpc_main + 377
15  com.apple.WebKit                    0x00000005401a48af WebKit::XPCServiceMain(int, char const**) + 554
16  libdyld.dylib                       0x00007fff70691cc9 start + 1

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