A licensee has reported that Custom Structs can cause a crash when using StompMalloc under certain situations.
Regression?: No
This occurs in 4.20
"D:\Epic Games\UE_4.20\Engine\Binaries\Win64\UE4Editor.exe" "D:\Unreal Projects\4.20\StompTest" -stompmalloc
Access violation - code c0000005 (first/second chance not available) UE4Editor_CoreUObject!UObjectProperty::GetObjectPropertyValue() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\propertyobject.cpp:153] UE4Editor_CoreUObject!FLinkerPlaceholderObjectImpl::ResolvePlaceholderValues() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerplaceholderbase.cpp:82] UE4Editor_CoreUObject!FLinkerPlaceholderBase::ResolvePlaceholderPropertyValues() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerplaceholderbase.cpp:514] UE4Editor_CoreUObject!FLinkerPlaceholderBase::ResolveAllPlaceholderReferences() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerplaceholderbase.cpp:434] UE4Editor_CoreUObject!TLinkerImportPlaceholder<UClass>::ResolveAllPlaceholderReferences() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerplaceholderbase.inl:63] UE4Editor_CoreUObject!FLinkerLoad::ResolveDependencyPlaceholder() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1586] UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1360] UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1376] UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3550] UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4244] UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4467] UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3864] UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2925] UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3087] UE4Editor_CoreUObject!LoadPackageInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1364] UE4Editor_CoreUObject!LoadPackage() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1471] UE4Editor_CoreUObject!ResolveName() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:828] UE4Editor_CoreUObject!StaticLoadObjectInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:916] UE4Editor_CoreUObject!StaticLoadObject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:983] UE4Editor_UnrealEd!FAssetDragDropOp::Init() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\draganddrop\assetdragdropop.cpp:215] UE4Editor_UnrealEd!FAssetDragDropOp::New() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\draganddrop\assetdragdropop.cpp:49] UE4Editor_ContentBrowser!SAssetView::OnDraggingAssetItem() [d:\build\++ue4\sync\engine\source\editor\contentbrowser\private\sassetview.cpp:4088] UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,FReply __cdecl(FGeometry const & __ptr64,FPointerEvent const & __ptr64)>::Execute() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269] UE4Editor_ContentBrowser!STableRow<TSharedPtr<FAssetViewItem,0> >::OnDragDetected() [d:\build\++ue4\sync\engine\source\runtime\slate\public\widgets\views\stablerow.h:562] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FDirectPolicy,FPointerEvent,<lambda_3d2f0c0de9bfb1f26dd3fbfeef226ad5> >() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:268] UE4Editor_Slate!FSlateApplication::RoutePointerMoveEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5628] UE4Editor_Slate!FSlateApplication::ProcessMouseMoveEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6194] UE4Editor_Slate!FSlateApplication::OnMouseMove() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6128] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1774] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2182] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:895] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:732] user32 user32 UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129] UE4Editor!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3417] UE4Editor!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:166] UE4Editor!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144] UE4Editor!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223] UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283] kernel32 ntdll
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-70072 in the post.