This is a long-standing Mac crash that occurs with low frequency, but has affected more than 500 users since it started (possibly in the 4.11 release)
It has recently been experienced internally by QA: [Link Removed]
User Descriptions
Callstack from Log
Cmd: QUIT_EDITOR LogExit: Preparing to exit. LogCrashTracker: LogMac: === Critical error: === SIGABRT: abort() called LogMac: __pthread_kill() Address = 0xb5f13d42 (filename not found) [in libsystem_kernel.dylib] abort() Address = 0xb5e79420 (filename not found) [in libsystem_c.dylib] __cxa_bad_cast() Address = 0xb49cd94a (filename not found) [in libc++abi.dylib] default_terminate_handler() Address = 0xb49f2c17 (filename not found) [in libc++abi.dylib] _objc_terminate() Address = 0xb5502713 (filename not found) [in libobjc.A.dylib] std::__terminate(void (*)()) Address = 0xb49efd49 (filename not found) [in libc++abi.dylib] __cxa_rethrow() Address = 0xb49ef9d2 (filename not found) [in libc++abi.dylib] objc_exception_rethrow() Address = 0xb550094a (filename not found) [in libobjc.A.dylib] CFRunLoopRunSpecific() Address = 0xa063819b (filename not found) [in CoreFoundation] RunCurrentEventLoopInMode() Address = 0x9fb98ebc (filename not found) [in HIToolbox] ReceiveNextEventCommon() Address = 0x9fb98bf9 (filename not found) [in HIToolbox] _BlockUntilNextEventMatchingListInModeWithFilter() Address = 0x9fb98b26 (filename not found) [in HIToolbox] _DPSNextEvent() Address = 0x9e131a54 (filename not found) [in AppKit] -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] Address = 0x9e8ad7ee (filename not found) [in AppKit] -[NSApplication run] Address = 0x9e1263db (filename not found) [in AppKit] tchar_main(int, wchar_t**) Address = 0xc43eb23 (filename not found) [in UE4Editor] main() Address = 0xc43e3b9 (filename not found) [in UE4Editor] start() Address = 0xb5de5235 (filename not found) [in libdyld.dylib]
Repro steps currently unknown, but seems to be caused by closing the editor.
#0 at 0x7fffbac4fd42 libsystem_kernel.dylib!<Unknown> libsystem_c.dylib!<Unknown> libc++abi.dylib!<Unknown> libc++abi.dylib!default_terminate_handler() libobjc.A.dylib!Unknown() libc++abi.dylib!std::__terminate(void (*)() libc++abi.dylib!<Unknown> libobjc.A.dylib!Unknown() CoreFoundation!Unknown() HIToolbox!<Unknown> HIToolbox!<Unknown> HIToolbox!<Unknown> AppKit!<Unknown> AppKit!-[NSApplication() AppKit!<Unknown> UE4Editor!tchar_main() UE4Editor!<Unknown> libdyld.dylib!<Unknown>
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-45755 in the post.