editing/caret/ios/fixed-caret-position-after-scroll.html This test recently because a flaky crash and started around commit r262685 iOS Debug History: https://results.webkit.org/?suite=layout-tests&test=editing%2Fcaret%2Fios%2Ffixed-caret-position-after-scroll.html Crash: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000bbadbeef Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [6790] VM Regions Near 0xbbadbeef: --> __TEXT 000000010403d000-0000000104141000 [ 1040K] r-x/r-x SM=COW /Users/USER/Library/Developer/CoreSimulator/Devices/2AA1B096-38B4-42DE-8475-9D225A84C0B9/data/Containers/Bundle/Application/11C37290-4919-41B3-A0BC-8EFED8D8B50E/WebKitTestRunnerApp.app/WebKitTestRunnerApp Application Specific Information: CRASHING TEST: editing/caret/ios/emoji.html CoreSimulator 704.12 - Device: Managed 7 (2AA1B096-38B4-42DE-8475-9D225A84C0B9) - Runtime: iOS 13.4 (17E255) - DeviceType: iPhone SE Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.JavaScriptCore 0x000000010507652e WTFCrash + 14 (Assertions.cpp:303) 1 com.apple.WebKit 0x00000001130d887b WTFCrashWithInfo(int, char const*, char const*, int) + 27 2 com.apple.WebKit 0x0000000113eef06c WebKit::WebPageProxy::didReceiveEvent(unsigned int, bool) + 1596 (WebPageProxy.cpp:6948) 3 com.apple.WebKit 0x0000000114a83a2e void IPC::callMemberFunctionImpl<WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(unsigned int, bool), std::__1::tuple<unsigned int, bool>, 0ul, 1ul>(WebKit::WebPageProxy*, void (WebKit::WebPageProxy::*)(unsigned int, bool), std::__1::tuple<unsigned int, bool>&&, std::__1::integer_sequence<unsigned long, 0ul, 1ul>) + 190 (HandleMessage.h:42) 4 com.apple.WebKit 0x0000000114a83820 void IPC::callMemberFunction<WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(unsigned int, bool), std::__1::tuple<unsigned int, bool>, std::__1::integer_sequence<unsigned long, 0ul, 1ul> >(std::__1::tuple<unsigned int, bool>&&, WebKit::WebPageProxy*, void (WebKit::WebPageProxy::*)(unsigned int, bool)) + 112 (HandleMessage.h:48) 5 com.apple.WebKit 0x0000000114a6e586 void IPC::handleMessage<Messages::WebPageProxy::DidReceiveEvent, WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(unsigned int, bool)>(IPC::Decoder&, WebKit::WebPageProxy*, void (WebKit::WebPageProxy::*)(unsigned int, bool)) + 150 (HandleMessage.h:115) 6 com.apple.WebKit 0x0000000114a6821e WebKit::WebPageProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 494 (WebPageProxyMessageReceiver.cpp:858) 7 com.apple.WebKit 0x00000001131ec411 IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 305 (MessageReceiverMap.cpp:124) 8 com.apple.WebKit 0x0000000113d301be WebKit::AuxiliaryProcessProxy::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 46 (AuxiliaryProcessProxy.cpp:210) 9 com.apple.WebKit 0x0000000113f2beaf WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 47 (WebProcessProxy.cpp:759) 10 com.apple.WebKit 0x000000011314aa0f IPC::Connection::dispatchMessage(IPC::Decoder&) + 431 (Connection.cpp:1002) 11 com.apple.WebKit 0x000000011314b340 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) + 528 12 com.apple.WebKit 0x0000000113149d50 IPC::Connection::dispatchIncomingMessages() + 1168 (Connection.cpp:1184) 13 com.apple.WebKit 0x000000011316a5a8 IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_7::operator()() + 72 (Connection.cpp:976) 14 com.apple.WebKit 0x000000011316a4ce WTF::Detail::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_7, void>::call() + 30 (Function.h:52) 15 com.apple.JavaScriptCore 0x00000001050a1cd2 WTF::Function<void ()>::operator()() const + 130 (Function.h:84) 16 com.apple.JavaScriptCore 0x000000010511b178 WTF::RunLoop::performWork() + 280 (RunLoop.cpp:120) 17 com.apple.JavaScriptCore 0x000000010511c921 WTF::RunLoop::performWork(void*) + 33 (RunLoopCF.cpp:39) 18 com.apple.CoreFoundation 0x000000010c055c71 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 19 com.apple.CoreFoundation 0x000000010c055b9c __CFRunLoopDoSource0 + 76 20 com.apple.CoreFoundation 0x000000010c0553cc __CFRunLoopDoSources0 + 268 21 com.apple.CoreFoundation 0x000000010c04ff6e __CFRunLoopRun + 974 22 com.apple.CoreFoundation 0x000000010c04f884 CFRunLoopRunSpecific + 404 23 com.apple.Foundation 0x000000010b6c8831 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 211 24 org.webkit.WebKitTestRunnerApp 0x00000001040a4c1e WTR::TestController::platformRunUntil(bool&, WTF::Seconds) + 302 25 org.webkit.WebKitTestRunnerApp 0x000000010406122f WTR::TestController::runUntil(bool&, WTF::Seconds) + 79 26 org.webkit.WebKitTestRunnerApp 0x000000010404d870 WTR::TestController::platformResetStateToConsistentValues(WTR::TestOptions const&) + 1792 27 org.webkit.WebKitTestRunnerApp 0x0000000104067331 WTR::TestController::resetStateToConsistentValues(WTR::TestOptions const&, WTR::TestController::ResetStage) + 2193 28 org.webkit.WebKitTestRunnerApp 0x00000001040aac89 WTR::TestInvocation::invoke() + 521 29 org.webkit.WebKitTestRunnerApp 0x000000010406b2b6 WTR::TestController::runTest(char const*) + 534 30 org.webkit.WebKitTestRunnerApp 0x000000010406bce6 WTR::TestController::runTestingServerLoop() + 214 31 org.webkit.WebKitTestRunnerApp 0x0000000104061d17 WTR::TestController::run() + 39 32 org.webkit.WebKitTestRunnerApp 0x00000001040615e9 WTR::TestController::TestController(int, char const**) + 921 33 org.webkit.WebKitTestRunnerApp 0x0000000104061de3 WTR::TestController::TestController(int, char const**) + 35 34 org.webkit.WebKitTestRunnerApp 0x0000000104046e9c -[WebKitTestRunnerApp _runTestController] + 44 35 com.apple.Foundation 0x000000010b6dea02 __NSThreadPerformPerform + 209 36 com.apple.CoreFoundation 0x000000010c055c71 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 37 com.apple.CoreFoundation 0x000000010c055b9c __CFRunLoopDoSource0 + 76 38 com.apple.CoreFoundation 0x000000010c0553cc __CFRunLoopDoSources0 + 268 39 com.apple.CoreFoundation 0x000000010c04ff6e __CFRunLoopRun + 974 40 com.apple.CoreFoundation 0x000000010c04f884 CFRunLoopRunSpecific + 404 41 com.apple.GraphicsServices 0x000000010bc64c1a GSEventRunModal + 139 42 com.apple.UIKitCore 0x000000013e0f8220 UIApplicationMain + 1605 43 org.webkit.WebKitTestRunnerApp 0x0000000104047048 main + 136 44 libdyld.dylib 0x0000000111dc910d start + 1
<rdar://problem/64119053>
ASSERTION FAILED: !m_keyEventQueue.isEmpty() /Volumes/Data/slave/ios-simulator-13-debug/build/Source/WebKit/UIProcess/WebPageProxy.cpp(6948) : void WebKit::WebPageProxy::didReceiveEvent(uint32_t, bool) It does indeed seem to be related to r262685.
It would be fine to revert r262685.
The change was reverted in https://trac.webkit.org/changeset/262685/webkit