Unreal Engine Issues and Bug Tracker (UE-47478)

Description

This is a common crash affecting users in 4.16. Unfortunately they have not provided any additional details.

Source Context

3684       	// Remove null layer infos
 3685       	EditorLayerSettings.RemoveAll([](const FLandscapeEditorLayerSettings& Entry) { return Entry.LayerInfoObj == nullptr; });
 3686       
 3687       	ULandscapeInfo* Info = GetLandscapeInfo();
 3688       	bool bRemovedAnyLayers = false;
 3689       	for (ULandscapeComponent* Component : LandscapeComponents)
 3690       	{
 3691 ***** 		int32 NumNullLayers = Algo::CountIf(Component->WeightmapLayerAllocations, [](const FWeightmapLayerAllocationInfo& Allocation) { return Allocation.LayerInfo == nullptr; });
 3692       		if (NumNullLayers > 0)
 3693       		{
 3694       			FLandscapeEditDataInterface LandscapeEdit(Info);
 3695       			for (int32 i = 0; i < NumNullLayers; ++i)
 3696       			{
 3697       				// DeleteLayer doesn't expect duplicates, so we need to call it once for each null
 3698       				Component->DeleteLayer(nullptr, LandscapeEdit);
 3699       			}
 3700       			bRemovedAnyLayers = true;
 3701       		}
 3702       	}

Steps to Reproduce

repro steps currently unknown
callstack indicates something was being force-deleted.

Callstack

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Landscape!ALandscapeProxy::PostEditChangeProperty() [landscapeedit.cpp:3692]
UE4Editor_Landscape!ALandscape::PostEditChangeProperty() [landscapeedit.cpp:3851]
UE4Editor_UnrealEd!ObjectTools::ForceReplaceReferences() [objecttools.cpp:774]
UE4Editor_UnrealEd!ObjectTools::ForceDeleteObjects() [objecttools.cpp:2295]
UE4Editor_UnrealEd!FAssetDeleteModel::DoForceDelete() [assetdeletemodel.cpp:316]
UE4Editor_UnrealEd!SDeleteAssetsDialog::ForceDelete() [sdeleteassetsdialog.cpp:717]
UE4Editor_UnrealEd!TMemberFunctionCaller<SDeleteAssetsDialog,FReply() [delegateinstanceinterface.h:165]
UE4Editor_UnrealEd!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SDeleteAssetsDialog,FReply() [tuple.h:497]
UE4Editor_UnrealEd!TBaseSPMethodDelegateInstance<0,SDeleteAssetsDialog,0,FReply __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:278]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() [slateapplication.cpp:5049]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [slateapplication.cpp:239]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5038]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5515]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5495]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1704]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:714]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsApplication::PumpMessages() [windowsapplication.cpp:2139]
UE4Editor_Slate!FSlateApplication::TickPlatform() [slateapplication.cpp:1570]
UE4Editor_Slate!FSlateApplication::AddModalWindow() [slateapplication.cpp:2048]
UE4Editor_UnrealEd!UEditorEngine::EditorAddModalWindow() [editorengine.cpp:3820]
UE4Editor_UnrealEd!ObjectTools::DeleteObjects() [objecttools.cpp:1827]
UE4Editor_UnrealEd!ObjectTools::DeleteAssets() [objecttools.cpp:1734]
UE4Editor_ContentBrowser!FAssetContextMenu::ExecuteDelete() [assetcontextmenu.cpp:1816]
UE4Editor_ContentBrowser!SContentBrowser::HandleDeleteCommandExecute() [scontentbrowser.cpp:2082]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_Slate!FUICommandList::ConditionalProcessCommandBindings() [uicommandlist.cpp:216]
UE4Editor_Slate!FUICommandList::ProcessCommandBindings() [uicommandlist.cpp:160]
UE4Editor_ContentBrowser!SContentBrowser::OnKeyDown() [scontentbrowser.cpp:1028]
UE4Editor_Slate!<lambda_2afcd964c763e269e2d1a63f3a72f846>::operator() [slateapplication.cpp:4630]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_2afcd964c763e269e2d1a63f3a72f846> >() [slateapplication.cpp:239]
UE4Editor_Slate!FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_2afcd964c763e269e2d1a63f3a72f846>,FKeyEvent>() [slateapplication.cpp:221]
UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() [slateapplication.cpp:4628]
UE4Editor_Slate!FSlateApplication::OnKeyDown() [slateapplication.cpp:4541]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1539]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:714]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3058]
UE4Editor!GuardedMain() [launch.cpp:166]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134]
UE4Editor!WinMain() [launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:253]
kernel32!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()

Community References

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.16
Target Fix	4.17

Fix Commit	3545873
Main Commit	3596628
Release Commit	3545873

Created	Jul 19, 2017
Resolved	Jul 20, 2017
Updated	Apr 27, 2018

View Jira Issue

UE-47478

[CrashReport] UE4Editor_Landscape!ALandscapeProxy::PostEditChangeProperty() [landscapeedit.cpp:3692]

[CrashReport] UE4Editor_Landscape!ALandscapeProxy::PostEditChangeProperty() [landscapeedit.cpp:3692]

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