[Webkit-unassigned] [Bug 227457] New: REGRESSION: [Big Sur Release ARM64 wk2] fullscreen/full-screen-remove-ancestor.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227457

            Bug ID: 227457
           Summary: REGRESSION: [Big Sur Release ARM64 wk2]
                    fullscreen/full-screen-remove-ancestor.html is a flaky
                    crash
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ehutchison at apple.com

Created attachment 432415

  --> https://bugs.webkit.org/attachment.cgi?id=432415&action=review

Crash Log

fullscreen/full-screen-remove-ancestor.html 

Started seeing the crash around r278412.

History: https://results.webkit.org/?suite=layout-tests&test=fullscreen%2Ffull-screen-remove-ancestor.html&platform=ios&platform=mac&version_name=iOS%2014&version_name=Catalina&version_name=Big%20Sur

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_trace.dylib               0x0000000188a539e8 os_trace_blob_addns + 8
1   libsystem_trace.dylib               0x0000000188a536d0 _os_log_fmt_flatten_data_into_blob + 104
2   libsystem_trace.dylib               0x0000000188a5360c _os_log_fmt_flatten_to_blob + 268
3   libsystem_trace.dylib               0x0000000188a520f4 _os_log_impl_flatten_and_send + 2212
4   libsystem_trace.dylib               0x0000000188a51838 _os_log + 148
5   libsystem_trace.dylib               0x0000000188a5179c _os_log_impl + 24
6   com.apple.WebCore                   0x0000000104d43260 void WTF::Logger::log<WTF::Logger::LogSiteIdentifier, char [41]>(WTFLogChannel&, WTFLogLevel, WTF::Logger::LogSiteIdentifier const&, char const (&) [41]) + 276 (Logger.h:316)
7   com.apple.WebCore                   0x0000000105c320b0 error<WTF::Logger::LogSiteIdentifier, char [41]> + 36 (Logger.h:154) [inlined]

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