http/tests/security/cross-origin-shared-worker-allowed.html is flaky: +CONSOLE MESSAGE: line 1: ReferenceError: Can't find variable: self This test is trivially simple, so it's a pretty big correctness issue. In debug builds, it asserts: Thread 28 Crashed:: WebCore: Worker 0 com.apple.JavaScriptCore 0x000000010b20bdea WTFCrash + 42 (Assertions.cpp:321) 1 com.apple.JavaScriptCore 0x000000010afe9776 JSC::HashTable::createTable() const + 70 (Lookup.cpp:31) 2 com.apple.WebCore 0x00000001106dafeb JSC::HashTable::initializeIfNeeded() const + 43 (Lookup.h:91) 3 com.apple.WebCore 0x00000001106dad70 JSC::HashTable::entry(JSC::PropertyName) const + 32 (Lookup.h:98) 4 com.apple.WebCore 0x000000011077d864 bool JSC::getStaticFunctionSlot<JSC::JSObject>(JSC::ExecState*, JSC::HashTable const&, JSC::JSObject*, JSC::PropertyName, JSC::PropertySlot&) + 100 (Lookup.h:229) 5 com.apple.WebCore 0x0000000110c5d179 WebCore::JSWorkerGlobalScopePrototype::getOwnPropertySlot(JSC::JSObject*, JSC::ExecState*, JSC::PropertyName, JSC::PropertySlot&) + 89 (JSWorkerGlobalScope.cpp:634) 6 com.apple.JavaScriptCore 0x000000010a948b47 JSC::JSObject::fastGetOwnPropertySlot(JSC::ExecState*, JSC::VM&, JSC::Structure&, JSC::PropertyName, JSC::PropertySlot&) + 167 (JSObject.h:1261) 7 com.apple.JavaScriptCore 0x000000010a948926 JSC::JSObject::getPropertySlot(JSC::ExecState*, JSC::PropertyName, JSC::PropertySlot&) + 150 (JSObject.h:1273) 8 com.apple.JavaScriptCore 0x000000010a96c811 JSC::JSValue::get(JSC::ExecState*, JSC::PropertyName, JSC::PropertySlot&) const + 257 (JSCJSValueInlines.h:695) 9 com.apple.JavaScriptCore 0x000000010afdea21 llint_slow_path_get_by_id + 241 (LLIntSlowPaths.cpp:578) This is ASSERT(!keys).
This particular test is no longer relevant, with shared workers being removed. I don't remember if we hit this crash elsewhere, but the root cause seems unlikely to be specific to shared workers.
<rdar://problem/28228216>