Unreal Engine Issues

UE-41202

Assert in EditorEngine.cpp after HotReload

Assert in EditorEngine.cpp after HotReload

Description

This occurred when I tried to repro an ensure and crash the resulted in [Link Removed]. In the crash group on the Crashreport website I noticed that KimK had the same callstack as this one. She wrote [Link Removed], but that marked as Cannot Reproduce.

Steps to Reproduce

Repro:

  1. Sync QAGame to the same CL as the latest binary build.
  2. Open a copy of QAGame with the latest binary build
  3. In the Content Browser, find the C++ class QAHotReloadUPROP and created a C++ derived from it named CowCPP
  4. Right click on CowCPP and create a Blueprint class based on CowCPP and name it CowBP.
  5. Place an instance of CowBP into the level.
  6. Switch to Visual Studio and add the following code to CowCPP.h below the GENERATED_BODY() macro: 
    public:
UPROPERTY(Category = ThingsAndStuff, BlueprintReadWrite, EditAnywhere) float Stealthiness;
	
UPROPERTY(Category = ThingsAndStuff, BlueprintReadOnly) bool KingCow;
  7. Click the compile button in UE4Editor
  8. Open CowBP in the Blueprint subeditor and focus the Event Graph
  9. Right click in the event graph, search for the category "things", and place the following nodes in he event graph:
    1. "Get King Cow" node
    2. "Get Stealthiness" node
    3. "Set Stealthiness" node
  10. In CowCPP.h, change Stealthiness to Stealth, and set it equal to 3.0f. 
    UPROPERTY(Category = ThingsAndStuff, BlueprintReadWrite, EditAnywhere) float Stealth = 3.0f;
  11. Click the Compile button in the editor.

Result:
UE4Editor crashes while trying to HotReload.

Expected:
Project is able to HotReload without crashing.

Frequency:
3/3

Callstack
LogDirectoryWatcher: A directory notification for 'D:/Builds/Release-4.15/QAGame 4.15/Content/' was aborted.
LogExit: Editor shut down
LogExit: Transaction tracking system shut down
LogExit: Editor shut down
LogWindows: Windows GetLastError: The operation completed successfully. (0)
LogCrashTracker: 


LogCrashTracker: 


LogWindows:Error: === Critical error: ===
LogWindows:Error: 
LogWindows:Error: Assertion failed: false [File:D:\Build\++UE4+Release-4.15+Compile\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp] [Line: 6756] 
LogWindows:Error: 
LogWindows:Error: 
LogWindows:Error: 
LogWindows:Error: KERNELBASE.dll!0x0000000029057788
LogWindows:Error: UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:120]
LogWindows:Error: UE4Editor-Core.dll!FOutputDevice::Logf__VA() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
LogWindows:Error: UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
LogWindows:Error: UE4Editor-UnrealEd.dll!UEditorEngine::GetEditorWorldContext() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:6757]
LogWindows:Error: UE4Editor-UnrealEd.dll!FEditorFileUtils::AutosaveMapEx() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\filehelpers.cpp:2365]
LogWindows:Error: UE4Editor-UnrealEd.dll!FPackageAutoSaver::AttemptAutoSave() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\packageautosaver.cpp:195]
LogWindows:Error: UE4Editor-UnrealEd.dll!UUnrealEdEngine::Tick() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:419]
LogWindows:Error: UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3025]
LogWindows:Error: UE4Editor.exe!GuardedMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
LogWindows:Error: UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
LogWindows:Error: UE4Editor.exe!WinMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
LogWindows:Error: UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
LogWindows:Error: KERNEL32.DLL!0x00000000297A8364
LogWindows:Error: ntdll.dll!0x000000002C1870D1
LogWindows:Error: ntdll.dll!0x000000002C1870D1
LogWindows:Error: 
LogExit: Executing StaticShutdownAfterError
LogWindows: FPlatformMisc::RequestExit(1)
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Cannot Reproduce
ComponentUE - Foundation - Core
Affects Versions4.15
CreatedJan 27, 2017
ResolvedJan 30, 2017
UpdatedJul 14, 2021
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