Unreal Engine Issues and Bug Tracker (UE-87506)

Description

Crash occurs when the user adds a sublevel to the current level, edits the sublevel's level blueprint, and then attempts to make a new level.

The state which triggers the crash seems to be when the sublevel is saved, but the main level is not, which results in a prompt to save it on creating the new level.

See https://udn.unrealengine.com/questions/551087/old-world-not-cleaned-up-by-garbage-collection-rel.html

Steps to Reproduce

Create and open a blank blueprint project.
Save the current level.
Open the Levels window.
From the Levels window, select Levels > Create New, and select Empty Level.
Give a name and Save the level (this will create a sublevel to your current level).
In the Main Editor Toolbar, select Blueprints > Sublevels > Edit <Sublevel Level Blueprint>.
Add a variable and Compile and Save.
Go to File > New Level, select Default.
When prompted, save the current level.

RESULT

Crash

Callstack

Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Editor/UnrealEd/Private/EditorServer.cpp] [Line: 1992] 
World Memory Leaks: 3 leaks objects and packages. See The output above.


KERNELBASE.dll!UnknownFunction []
UE4Editor-Core.dll!ReportAssert() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowsplatformcrashcontext.cpp:1341]
UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:79]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
UE4Editor-UnrealEd.dll!UEditorEngine::CheckForWorldGCLeaks() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorserver.cpp:1994]
UE4Editor-UnrealEd.dll!UEditorEngine::EditorDestroyWorld() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorserver.cpp:2115]
UE4Editor-UnrealEd.dll!UEditorEngine::Map_Load() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorserver.cpp:2469]
UE4Editor-UnrealEd.dll!UEditorEngine::HandleMapCommand() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorserver.cpp:6106]
UE4Editor-UnrealEd.dll!UEditorEngine::Exec() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorserver.cpp:5586]
UE4Editor-UnrealEd.dll!UUnrealEdEngine::Exec() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\unrealedsrv.cpp:696]
UE4Editor-UnrealEd.dll!FEditorFileUtils::LoadMap() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\filehelpers.cpp:2466]
UE4Editor-LevelEditor.dll!FLevelEditorActionCallbacks::NewLevel() [d:\build\++ue4\sync\engine\source\editor\leveleditor\private\leveleditoractions.cpp:226]
UE4Editor-LevelEditor.dll!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:854]
UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:102]
UE4Editor-Slate.dll!SMenuEntryBlock::OnClicked() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1059]
UE4Editor-Slate.dll!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1019]
UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:293]
UE4Editor-Slate.dll!SButton::ExecuteOnClick() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:385]
UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:304]
UE4Editor-Slate.dll!SMenuEntryButton::OnMouseButtonUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:386]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_6c1f6b862bcfb82ea6dcab28fbcc9463> >() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:372]
UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4617]
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5140]
UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5108]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1958]
UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2410]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1638]
UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:789]
USER32.dll!UnknownFunction []
USER32.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:130]
UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:4397]
UE4Editor.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:173]
UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:263]
UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\2\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Gameplay
Affects Versions	4.24
Target Fix	4.24.3

Fix Commit	11178003
Main Commit	11179276
Release Commit	11178003

Created	Jan 27, 2020
Resolved	Jan 30, 2020
Updated	Jan 26, 2021

View Jira Issue

UE-87506

World Memory Leak crash creating new level blueprint after editing sub level blueprint

World Memory Leak crash creating new level blueprint after editing sub level blueprint

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