inspector/animation/nameChanged.html Test is a flaky crash according to history on macOS wk1 Debug. The first occurrence can be seen at the limit of current history at r262620 but there is no indication that revision is the cause. History: https://results.webkit.org/?suite=layout-tests&test=inspector%2Fanimation%2FnameChanged.html&platform=mac&flavor=wk1&limit=50000 Crash log: Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.JavaScriptCore 0x000000010553e46e WTFCrash + 14 (Assertions.cpp:295) 1 com.apple.WebCore 0x000000012031684b WTFCrashWithInfo(int, char const*, char const*, int) + 27 2 com.apple.WebCore 0x00000001230f1ef9 WTF::HashTableConstIterator<WebCore::WebAnimation*, WebCore::WebAnimation*, WTF::IdentityExtractor, WTF::DefaultHash<WebCore::WebAnimation*>, WTF::HashTraits<WebCore::WebAnimation*>, WTF::HashTraits<WebCore::WebAnimation*> >::checkValidity() const + 105 (HashTable.h:217) 3 com.apple.WebCore 0x00000001230f1e0c WTF::HashTableConstIterator<WebCore::WebAnimation*, WebCore::WebAnimation*, WTF::IdentityExtractor, WTF::DefaultHash<WebCore::WebAnimation*>, WTF::HashTraits<WebCore::WebAnimation*>, WTF::HashTraits<WebCore::WebAnimation*> >::operator++() + 28 4 com.apple.WebCore 0x0000000123070566 WTF::HashTableConstIteratorAdapter<WTF::HashTable<WebCore::WebAnimation*, WebCore::WebAnimation*, WTF::IdentityExtractor, WTF::DefaultHash<WebCore::WebAnimation*>, WTF::HashTraits<WebCore::WebAnimation*>, WTF::HashTraits<WebCore::WebAnimation*> >, WebCore::WebAnimation*>::operator++() + 38 (HashTable.h:1571) 5 com.apple.WebCore 0x0000000123a1e526 WebCore::InspectorAnimationAgent::enable(WTF::String&) + 358 (InspectorAnimationAgent.cpp:268) 6 com.apple.JavaScriptCore 0x0000000106823ec7 Inspector::AnimationBackendDispatcher::enable(long, WTF::RefPtr<WTF::JSONImpl::Object, WTF::DumbPtrTraits<WTF::JSONImpl::Object> >&&) + 103 (InspectorBackendDispatchers.cpp:140) 7 com.apple.JavaScriptCore 0x0000000106823d79 Inspector::AnimationBackendDispatcher::dispatch(long, WTF::String const&, WTF::Ref<WTF::JSONImpl::Object, WTF::DumbPtrTraits<WTF::JSONImpl::Object> >&&) + 905 (InspectorBackendDispatchers.cpp:125)
<rdar://problem/67679706>
Test expectation while investigated: https://trac.webkit.org/changeset/266058/webkit
Not super frequent, started in mid to late July.