[Webkit-unassigned] [Bug 222824] New: [Big Sur arm64] TestWebKitAPI.WebKit.AccessibilityReduceMotion is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222824

            Bug ID: 222824
           Summary: [Big Sur arm64]
                    TestWebKitAPI.WebKit.AccessibilityReduceMotion is a
                    flaky crash
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com
                CC: pvollan at apple.com,
                    webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com

Created attachment 422414

  --> https://bugs.webkit.org/attachment.cgi?id=422414&action=review

crash log

TestWebKitAPI.WebKit.AccessibilityReduceMotion is a flaky crash on the (new) Big Sur Apple Silicon bots

Thread 8 Crashed:: Dispatch queue: com.apple.root.default-qos
0   libobjc.A.dylib                     0x00000001a58ab178 objc_msgSend + 24
1   com.apple.WebKit                    0x000000010b8f6eec -[WKUserDefaults findPreferenceChangesAndNotifyForKeys:toValuesForKeys:] + 924 (PreferenceObserver.mm:81)
2   com.apple.WebKit                    0x000000010b8f73dc -[WKUserDefaults _notifyObserversOfChangeFromValuesForKeys:toValuesForKeys:]::$_1::operator()() const + 100 (PreferenceObserver.mm:98)
3   com.apple.WebKit                    0x000000010b8f736c __76-[WKUserDefaults _notifyObserversOfChangeFromValuesForKeys:toValuesForKeys:]_block_invoke + 28 (PreferenceObserver.mm:97)
4   libdispatch.dylib                   0x00000001a58638bc _dispatch_call_block_and_release + 32
5   libdispatch.dylib                   0x00000001a5865420 _dispatch_client_callout + 20
6   libdispatch.dylib                   0x00000001a58760d8 _dispatch_root_queue_drain + 656
7   libdispatch.dylib                   0x00000001a58767a4 _dispatch_worker_thread2 + 116
8   libsystem_pthread.dylib             0x00000001a5a0e024 _pthread_wqthread + 216
9   libsystem_pthread.dylib             0x00000001a5a0cd94 start_wqthread + 8

https://build.webkit.org/#/builders/103/builds/19/steps/11/logs/stdio

https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.WebKit.AccessibilityReduceMotion

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