Unreal Engine Issues and Bug Tracker (UE-81839)

Description

The level blueprint has a macro that references a level.
FBlueprintNodeTemplateCache keeps holding this cashe at transition level.

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Cmd: MAP LOAD FILE="../../../../MacroMemoryLeak/Content/ThirdPersonBP/Maps/ThirdPersonExampleMap.umap" TEMPLATE=0 SHOWPROGRESS=1 FEATURELEVEL=3
LightingResults: New page: Lighting Build
LoadErrors: New page: Loading map: ThirdPersonExampleMap.umap
LogWorld: UWorld::CleanupWorld for ThirdPersonExampleMap, bSessionEnded=true, bCleanupResources=true
MapCheck: New page: Map Check
LightingResults: New page: Lighting Build
LogUObjectHash: Compacting FUObjectHashTables data took   3.06ms
LogReferenceChain: (root) GCObjectReferencer /Engine/Transient.GCObjectReferencer_0::AddReferencedObjects(): FBlueprintNodeTemplateCache
LogReferenceChain:  K2Node_MacroInstance /Engine/Transient.PROTO_BP_Blueprint_0:UserConstructionScript.K2Node_MacroInstance_23->MacroGraph
LogReferenceChain:   EdGraph /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap.NewMacro_0->Outer
LogReferenceChain:    LevelScriptBlueprint /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap->Outer
LogReferenceChain:     Level /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel->Outer
LogReferenceChain:      World /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap
LogReferenceChain:   
LogEditorServer: Error: Old world /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap not cleaned up by garbage collection while loading new map! Referenced by:
(root) GCObjectReferencer /Engine/Transient.GCObjectReferencer_0::AddReferencedObjects(): FBlueprintNodeTemplateCache
 K2Node_MacroInstance /Engine/Transient.PROTO_BP_Blueprint_0:UserConstructionScript.K2Node_MacroInstance_23->MacroGraph
  EdGraph /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap.NewMacro_0->Outer
   LevelScriptBlueprint /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap->Outer
    Level /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel->Outer
     World /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap
LogReferenceChain: (root) GCObjectReferencer /Engine/Transient.GCObjectReferencer_0::AddReferencedObjects(): FBlueprintNodeTemplateCache
LogReferenceChain:  K2Node_MacroInstance /Engine/Transient.PROTO_BP_Blueprint_0:UserConstructionScript.K2Node_MacroInstance_23->MacroGraph
LogReferenceChain:   EdGraph /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap.NewMacro_0->Outer
LogReferenceChain:    LevelScriptBlueprint /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap->GeneratedClass
LogReferenceChain:     BlueprintGeneratedClass /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap_C->Outer
LogReferenceChain:      Package /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap
LogReferenceChain:   
LogEditorServer: Error: Old level package /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap not cleaned up by garbage collection while loading new map! Referenced by:
(root) GCObjectReferencer /Engine/Transient.GCObjectReferencer_0::AddReferencedObjects(): FBlueprintNodeTemplateCache
 K2Node_MacroInstance /Engine/Transient.PROTO_BP_Blueprint_0:UserConstructionScript.K2Node_MacroInstance_23->MacroGraph
  EdGraph /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap.NewMacro_0->Outer
   LevelScriptBlueprint /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap:PersistentLevel.ThirdPersonExampleMap->GeneratedClass
    BlueprintGeneratedClass /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap.ThirdPersonExampleMap_C->Outer
     Package /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap
LogOutputDevice: Warning:

Steps to Reproduce

Open attached project with UE4.23
Open NewWidgetBlueprint
Open ThirdPersonExsampleMap
Engine shows memory leak dialog

[Link Removed]

Callstack

UE4Editor-Core.dll!ReportAssert() [d:\dev\ue423\engine\source\runtime\core\private\windows\windowsplatformcrashcontext.cpp:582]
UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [d:\dev\ue423\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:79]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\dev\ue423\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
UE4Editor-Core.dll!AssertFailedImplV() [d:\dev\ue423\engine\source\runtime\core\private\misc\assertionmacros.cpp:101]
UE4Editor-Core.dll!FDebug::AssertFailed() [d:\dev\ue423\engine\source\runtime\core\private\misc\assertionmacros.cpp:455]
UE4Editor-UnrealEd.dll!UEditorEngine::CheckForWorldGCLeaks() [d:\dev\ue423\engine\source\editor\unrealed\private\editorserver.cpp:1994]
UE4Editor-UnrealEd.dll!UEditorEngine::EditorDestroyWorld() [d:\dev\ue423\engine\source\editor\unrealed\private\editorserver.cpp:2115]
UE4Editor-UnrealEd.dll!UEditorEngine::Map_Load() [d:\dev\ue423\engine\source\editor\unrealed\private\editorserver.cpp:2469]
UE4Editor-UnrealEd.dll!UEditorEngine::HandleMapCommand() [d:\dev\ue423\engine\source\editor\unrealed\private\editorserver.cpp:6085]
UE4Editor-UnrealEd.dll!UEditorEngine::Exec() [d:\dev\ue423\engine\source\editor\unrealed\private\editorserver.cpp:5569]
UE4Editor-UnrealEd.dll!UUnrealEdEngine::Exec() [d:\dev\ue423\engine\source\editor\unrealed\private\unrealedsrv.cpp:691]
UE4Editor-UnrealEd.dll!FEditorFileUtils::LoadMap() [d:\dev\ue423\engine\source\editor\unrealed\private\filehelpers.cpp:2446]
UE4Editor-AssetTools.dll!FAssetTypeActions_World::OpenAssetEditor() [d:\dev\ue423\engine\source\developer\assettools\private\assettypeactions\assettypeactions_world.cpp:32]
UE4Editor-UnrealEd.dll!FAssetEditorManager::OpenEditorForAsset() [d:\dev\ue423\engine\source\editor\unrealed\private\toolkits\asseteditormanager.cpp:390]
UE4Editor-AssetTools.dll!FAssetTypeActions_Base::AssetsActivated() [d:\dev\ue423\engine\source\developer\assettools\public\assettypeactions_base.h:57]
UE4Editor-ContentBrowser.dll!SContentBrowser::OnAssetsActivated() [d:\dev\ue423\engine\source\editor\contentbrowser\private\scontentbrowser.cpp:2123]
UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl(TArray<FAssetData,TSizedDefaultAllocator<32> > const &,enum EAssetTypeActivationMethod::Type)>::ExecuteIfSafe() [d:\dev\ue423\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:369]
UE4Editor-ContentBrowser.dll!SAssetView::OnListMouseButtonDoubleClick() [d:\dev\ue423\engine\source\editor\contentbrowser\private\sassetview.cpp:4297]
UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl(TSharedPtr<FAssetViewItem,0>)>::ExecuteIfSafe() [d:\dev\ue423\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:369]
UE4Editor-ContentBrowser.dll!TBaseDelegate<void,TSharedPtr<FAssetViewItem,0> >::ExecuteIfBound() [d:\dev\ue423\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:673]
UE4Editor-ContentBrowser.dll!SListView<TSharedPtr<FAssetViewItem,0> >::Private_OnItemDoubleClicked() [d:\dev\ue423\engine\source\runtime\slate\public\widgets\views\slistview.h:883]
UE4Editor-ContentBrowser.dll!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonDoubleClick() [d:\dev\ue423\engine\source\runtime\slate\public\widgets\views\stablerow.h:334]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_cde3b80cdb8a457b0f09fee78051d179> >() [d:\dev\ue423\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:273]
UE4Editor-Slate.dll!FSlateApplication::RoutePointerDoubleClickEvent() [d:\dev\ue423\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6246]
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [d:\dev\ue423\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6233]
UE4Editor-Slate.dll!FSlateApplication::OnMouseDoubleClick() [d:\dev\ue423\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6203]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [d:\dev\ue423\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1884]
UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [d:\dev\ue423\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2332]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [d:\dev\ue423\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1560]
UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [d:\dev\ue423\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:790]

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.23
Target Fix	4.24

Fix Commit	9663078
Main Commit	9663081
Release Commit	9663078

Created	Oct 15, 2019
Resolved	Oct 17, 2019
Updated	Jan 25, 2021

View Jira Issue

UE-81839

Blueprint macro in a level blueprint causes memory leak

Blueprint macro in a level blueprint causes memory leak

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