Created attachment 229546 [details] Crash log r167416 Reproducibility: once Steps: Launch WebKit. What happened: Crash. Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 ??? 000000000000000000 0 + 0 1 com.apple.WebKit2 0x000000010d301eb8 WebKit::ChildProcess::initialize(WebKit::ChildProcessInitializationParameters const&) + 36 2 com.apple.WebKit2 0x000000010d3ebdb9 _ZN6WebKit21XPCServiceInitializerINS_10WebProcessENS_29XPCServiceInitializerDelegateEEEvP8NSObjectS5_ + 201 3 com.apple.WebKit.WebContent.Development 0x0000000109e1599e ___ZN6WebKitL22XPCServiceEventHandlerEP8NSObject_block_invoke + 664 4 libxpc.dylib 0x00007fff8781c5cc _xpc_connection_call_event_handler + 58 5 libxpc.dylib 0x00007fff8781b1df _xpc_connection_mach_event + 2124 6 libdispatch.dylib 0x00007fff8c625ae2 _dispatch_client_callout4 + 9 7 libdispatch.dylib 0x00007fff8c62639c _dispatch_mach_msg_invoke + 143 8 libdispatch.dylib 0x00007fff8c624617 _dispatch_queue_drain + 359 9 libdispatch.dylib 0x00007fff8c625682 _dispatch_mach_invoke + 154 10 libdispatch.dylib 0x00007fff8c629e97 _dispatch_main_queue_callback_4CF + 244 11 com.apple.CoreFoundation 0x00007fff8c6fe5a9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 12 com.apple.CoreFoundation 0x00007fff8c6b97c4 __CFRunLoopRun + 1636 13 com.apple.CoreFoundation 0x00007fff8c6b8f25 CFRunLoopRunSpecific + 309 14 com.apple.HIToolbox 0x00007fff903ffa0d RunCurrentEventLoopInMode + 226 15 com.apple.HIToolbox 0x00007fff903ff7b7 ReceiveNextEventCommon + 479 16 com.apple.HIToolbox 0x00007fff903ff5bc _BlockUntilNextEventMatchingListInModeWithFilter + 65 17 com.apple.AppKit 0x00007fff8a1e526e _DPSNextEvent + 1434 18 com.apple.AppKit 0x00007fff8a1e48bb -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 19 com.apple.AppKit 0x00007fff8a1d89bc -[NSApplication run] + 553 20 com.apple.AppKit 0x00007fff8a1c37a3 NSApplicationMain + 940 21 com.apple.XPCService 0x00007fff846bdc0f _xpc_main + 385 22 libxpc.dylib 0x00007fff87824bde xpc_main + 399 23 com.apple.WebKit.WebContent.Development 0x0000000109e156a0 main + 16 24 libdyld.dylib 0x00007fff8661b5fd start + 1 Expected result: WebKit does not crash.