This is a regression from 4.14.3
This crash does NOT occur in PIE or Standalone Game
This does not occur on an El Capitan 10.11.6 MacbookPro or on Windows.
Result: Game crashes
FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x10580f71b (filename not found) [in UE4Editor-Core.dylib] FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x1059d42e8 (filename not found) [in UE4Editor-Core.dylib] FOutputDevice::Logf(wchar_t const*, ...) Address = 0x105ab6e97 (filename not found) [in UE4Editor-Core.dylib] FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x105a2f1a6 (filename not found) [in UE4Editor-Core.dylib] FMetalStateCache::PrepareToRestart() Address = 0x13e92932c (filename not found) [in UE4Editor-MetalRHI.dylib] FMetalRenderPass::RestartRenderPass(MTLRenderPassDescriptor*) Address = 0x13e91768e (filename not found) [in UE4Editor-MetalRHI.dylib] FMetalRenderPass::ConditionalSwitchToRender() Address = 0x13e929aee (filename not found) [in UE4Editor-MetalRHI.dylib] FMetalRenderPass::DrawIndexedPrimitive(id<MTLBuffer>, unsigned int, unsigned int, int, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int) Address = 0x13e91ca36 (filename not found) [in UE4Editor-MetalRHI.dylib] FMetalRHICommandContext::RHIDrawIndexedPrimitive(FRHIIndexBuffer*, unsigned int, int, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int) Address = 0x13e8fa9c1 (filename not found) [in UE4Editor-MetalRHI.dylib] FRHICommandDrawIndexedPrimitive::Execute(FRHICommandListBase&) Address = 0x10b67dedd (filename not found) [in UE4Editor-RHI.dylib] FRHICommandListExecutor::ExecuteInner_DoExecute(FRHICommandListBase&) Address = 0x10b6843bc (filename not found) [in UE4Editor-RHI.dylib] FRHICommandListExecutor::ExecuteInner(FRHICommandListBase&) Address = 0x10b686ae0 (filename not found) [in UE4Editor-RHI.dylib] FRHICommandListExecutor::ExecuteList(FRHICommandListBase&) Address = 0x10b68840a (filename not found) [in UE4Editor-RHI.dylib] FRHICommandListBase::~FRHICommandListBase() Address = 0x10b68ab8f (filename not found) [in UE4Editor-RHI.dylib] FRHICommandWaitForAndSubmitSubList::Execute(FRHICommandListBase&) Address = 0x10b6b3692 (filename not found) [in UE4Editor-RHI.dylib] FRHICommand<FRHICommandWaitForAndSubmitSubList>::ExecuteAndDestruct(FRHICommandListBase&, FRHICommandBase*) Address = 0x10b6b2997 (filename not found) [in UE4Editor-RHI.dylib] FRHICommandListExecutor::ExecuteInner_DoExecute(FRHICommandListBase&) Address = 0x10b6843bc (filename not found) [in UE4Editor-RHI.dylib] FExecuteRHIThreadTask::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) Address = 0x10b6be7ce (filename not found) [in UE4Editor-RHI.dylib] TGraphTask<FExecuteRHIThreadTask>::ExecuteTask(TArray<FBaseGraphTask*, FDefaultAllocator>&, ENamedThreads::Type) Address = 0x10b6be0e7 (filename not found) [in UE4Editor-RHI.dylib] FNamedTaskThread::ProcessTasksNamedThread(int, bool) Address = 0x105836841 (filename not found) [in UE4Editor-Core.dylib] FNamedTaskThread::ProcessTasksUntilQuit(int) Address = 0x1058322e5 (filename not found) [in UE4Editor-Core.dylib] FTaskGraphImplementation::ProcessThreadUntilRequestReturn(ENamedThreads::Type) Address = 0x10582eb61 (filename not found) [in UE4Editor-Core.dylib] FRHIThread::Run() Address = 0x10b608c5f (filename not found) [in UE4Editor-RenderCore.dylib] FRunnableThreadPThread::Run() Address = 0x10588ef83 (filename not found) [in UE4Editor-Core.dylib] FRunnableThreadPThread::_ThreadProc(void*) Address = 0x1058511b1 (filename not found) [in UE4Editor-Core.dylib] _pthread_body Address = 0x10f67aaab (filename not found) [in libsystem_pthread.dylib] _pthread_body Address = 0x10f67a9f7 (filename not found) [in libsystem_pthread.dylib] thread_start Address = 0x10f67a1fd (filename not found) [in libsystem_pthread.dylib]
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-40803 in the post.