REGRESSION No, I was able to reproduce the hard lock in 4.16.1.

A frequent ensure occurs when opening static or skeletal meshes on Mac.

Doesn't reproduce 100% of the time, but I've gotten it about 4 out of 5 times using the same meshes for repro.

It seems that with Macs using AMD graphics cards, this hard locks the Mac. NVIDIA machines eventually recover.

The locking up seems to have stopped after I went back to 4.16.1, triggered the ensure, and then triggered it again in 4.16.2. I managed to get the hard lock again after making a new copy of QAGame.

Seems related to [Link Removed].

Steps to Reproduce
  1. Open QAGame in editor on Mac.
  2. Repeatedly open static or skeletal meshes in sub editors
    • Reproduced this issue with SK_Mannequin, Main_Player_Export, and Eyeballs


Ensure triggers. If on AMD, the Mac hard locks.

Ensure condition failed: 0 [File:/Users/build/Build/++UE4+Release-4.16+Compile/Sync/Engine/Source/Runtime/Engine/Private/UnrealEngine.cpp] [Line: 6475]

FDebug::OptionallyLogFormattedEnsureMessageReturningFalse(bool, char const*, char const*, int, wchar_t const*, ...) Address = 0x834175d  (filename not found) [in UE4Editor-Core.dylib]
UEngine::PerformError(wchar_t const*, FOutputDevice&) Address = 0xae6aa88  (filename not found) [in UE4Editor-Engine.dylib]
UEngine::Exec(UWorld*, wchar_t const*, FOutputDevice&) Address = 0xae456c3  (filename not found) [in UE4Editor-Engine.dylib]
UEditorEngine::Exec(UWorld*, wchar_t const*, FOutputDevice&) Address = 0xf9ea1c3  (filename not found) [in UE4Editor-UnrealEd.dylib]
UUnrealEdEngine::Exec(UWorld*, wchar_t const*, FOutputDevice&) Address = 0x1067002c (filename not found) [in UE4Editor-UnrealEd.dylib]
SConsoleInputBox::OnTextCommitted(FText const&, ETextCommit::Type) Address = 0x504cc751 (filename not found) [in UE4Editor-OutputLog.dylib]
TBaseSPMethodDelegateInstance<false, SConsoleInputBox, (ESPMode)0, TTypeWrapper<void> (FText const&, ETextCommit::Type)>::Execute(FText const&, ETextCommit::Type) const Address = 0x504fb260 (filename not found) [in UE4Editor-OutputLog.dylib]
TBaseSPMethodDelegateInstance<false, SConsoleInputBox, (ESPMode)0, void (FText const&, ETextCommit::Type)>::ExecuteIfSafe(FText const&, ETextCommit::Type) const Address = 0x504fb30b (filename not found) [in UE4Editor-OutputLog.dylib]
FSlateEditableTextLayout::HandleCarriageReturn() Address = 0xe68d016  (filename not found) [in UE4Editor-Slate.dylib]
FSlateEditableTextLayout::HandleKeyDown(FKeyEvent const&) Address = 0xe68af72  (filename not found) [in UE4Editor-Slate.dylib]
SEditableText::OnKeyDown(FGeometry const&, FKeyEvent const&) Address = 0xe53cc51  (filename not found) [in UE4Editor-Slate.dylib]
SConsoleEditableTextBox::SConsoleEditableText::OnKeyDown(FGeometry const&, FKeyEvent const&) Address = 0x504fd1ad (filename not found) [in UE4Editor-OutputLog.dylib]
FSlateApplication::ProcessKeyDownEvent(FKeyEvent&) Address = 0xe2d68d2  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::OnKeyDown(int, unsigned int, bool) Address = 0xe2d4f98  (filename not found) [in UE4Editor-Slate.dylib]
FMacApplication::ProcessKeyDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow, (ESPMode)0>) Address = 0x82d97c4  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessEvent(FDeferredMacEvent const&) Address = 0x82cf811  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessDeferredEvents(float) Address = 0x82cd58f  (filename not found) [in UE4Editor-Core.dylib]
FSlateApplication::TickPlatform(float) Address = 0xe2ad9db  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Tick(ESlateTickType) Address = 0xe2ace14  (filename not found) [in UE4Editor-Slate.dylib]
FEngineLoop::Tick() Address = 0x76b780c  (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0x76bde12  (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0x76cc01a  (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0x82c4a26  (filename not found) [in UE4Editor-Core.dylib]
__NSThread__start__() Address = 0xd07fdb3d (filename not found) [in Foundation]
_pthread_body() Address = 0x1201b93b (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0x1201b887 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0x1201b08d (filename not found) [in libsystem_pthread.dylib]

May also show up as:

Ensure condition failed: 0 [File:/Users/build/Build/++UE4+Release-4.16+Compile/Sync/Engine/Source/Runtime/Renderer/Private/DistanceFieldObjectCulling.cpp] [Line: 668]

FDebug::OptionallyLogFormattedEnsureMessageReturningFalse(bool, char const*, char const*, int, wchar_t const*, ...) Address = 0x1023675d (filename not found) [in UE4Editor-Core.dylib]
BuildTileObjectLists(FRHICommandListImmediate&, FScene*, TArray<FViewInfo, FDefaultAllocator>&, FSceneRenderTargetItem&, FDistanceFieldAOParameters const&) Address = 0x21d0be12 (filename not found) [in UE4Editor-Renderer.dylib]
FDeferredShadingSceneRenderer::RenderDistanceFieldLighting(FRHICommandListImmediate&, FDistanceFieldAOParameters const&, TRefCountPtr<IPooledRenderTarget> const&, TRefCountPtr<IPooledRenderTarget>&, TRefCountPtr<IPooledRenderTarget>&, bool, bool, bool) Address = 0x21cfce88 (filename not found) [in UE4Editor-Renderer.dylib]
FDeferredShadingSceneRenderer::RenderDynamicSkyLighting(FRHICommandListImmediate&, TRefCountPtr<IPooledRenderTarget> const&, TRefCountPtr<IPooledRenderTarget>&) Address = 0x21cfbebd (filename not found) [in UE4Editor-Renderer.dylib]
FDeferredShadingSceneRenderer::Render(FRHICommandListImmediate&) Address = 0x21cef754 (filename not found) [in UE4Editor-Renderer.dylib]
FRendererModule::BeginRenderingViewFamily(FCanvas*, FSceneViewFamily*)::EURCMacro_FDrawSceneCommand::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) Address = 0x223520f0 (filename not found) [in UE4Editor-Renderer.dylib]
TGraphTask<FRendererModule::BeginRenderingViewFamily(FCanvas*, FSceneViewFamily*)::EURCMacro_FDrawSceneCommand>::ExecuteTask(TArray<FBaseGraphTask*, FDefaultAllocator>&, ENamedThreads::Type) Address = 0x223b3673 (filename not found) [in UE4Editor-Renderer.dylib]
FNamedTaskThread::ProcessTasksNamedThread(int, bool) Address = 0x1002418f (filename not found) [in UE4Editor-Core.dylib]
FNamedTaskThread::ProcessTasksUntilQuit(int) Address = 0x10020095 (filename not found) [in UE4Editor-Core.dylib]
FTaskGraphImplementation::ProcessThreadUntilRequestReturn(ENamedThreads::Type) Address = 0x1001c8d1 (filename not found) [in UE4Editor-Core.dylib]
RenderingThreadMain(FEvent*) Address = 0x11715d72 (filename not found) [in UE4Editor-RenderCore.dylib]
FRenderingThread::Run() Address = 0x1172a8e7 (filename not found) [in UE4Editor-RenderCore.dylib]
FRunnableThreadPThread::Run() Address = 0x10083480 (filename not found) [in UE4Editor-Core.dylib]
FRunnableThreadPThread::_ThreadProc(void*) Address = 0x1003f5f0 (filename not found) [in UE4Editor-Core.dylib]
_pthread_body() Address = 0x1a2f193b (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0x1a2f1887 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0x1a2f108d (filename not found) [in libsystem_pthread.dylib]

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ComponentUE - Graphics Features
Affects Versions4.
Target Fix4.16.2
Fix Commit3503158
Release Commit3523352
CreatedJun 6, 2017
ResolvedJun 21, 2017
UpdatedApr 27, 2018
View Jira Issue