This is a common crash in the 4.18 release. Users have not provided any descriptions about their actions when the crash occurred.
Source Context
301 /** 302 * Specialized assignment operator, only used when importing LOD's. 303 */ 304 void FColorVertexBuffer::operator=(const FColorVertexBuffer &Other) 305 { 306 //VertexData doesn't need to be allocated here because Build will be called next, 307 VertexData = NULL; 308 } 309 310 void FColorVertexBuffer::GetVertexColors( TArray<FColor>& OutColors ) const 311 { 312 ***** if( VertexData != NULL && NumVertices > 0 ) 313 { 314 OutColors.SetNumUninitialized( NumVertices ); 315 316 FMemory::Memcpy( OutColors.GetData(), VertexData->GetDataPointer(), NumVertices * VertexData->GetStride() ) ; 317 } 318 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_Engine!FColorVertexBuffer::GetVertexColors() [colorvertexbuffer.cpp:313] UE4Editor_Engine!RemapPaintedVertexColors() [staticmeshbuild.cpp:319] UE4Editor_MeshPaint!MeshPaintHelpers::ApplyVertexColorsToAllLODs() [meshpainthelpers.cpp:1177] UE4Editor_MeshPaintMode!FPaintModePainter::Reset() [paintmodepainter.cpp:927] UE4Editor_MeshPaint!IMeshPaintEdMode::Exit() [imeshpaintmode.cpp:138] UE4Editor_UnrealEd!FEditorModeTools::DeactivateModeAtIndex() [editormodemanager.cpp:303] UE4Editor_UnrealEd!FEditorModeTools::DeactivateMode() [editormodemanager.cpp:315] UE4Editor_LevelEditor!SLevelEditor::ToggleEditorMode() [sleveleditor.cpp:1255] UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027] UE4Editor_Slate!FUICommandList::ExecuteAction() [uicommandlist.cpp:97] UE4Editor_Slate!SToolBarButtonBlock::OnClicked() [stoolbarbuttonblock.cpp:300] UE4Editor_Slate!SToolBarButtonBlock::OnCheckStateChanged() [stoolbarbuttonblock.cpp:325] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_Slate!SCheckBox::ToggleCheckedState() [scheckbox.cpp:299] UE4Editor_Slate!SCheckBox::OnMouseButtonUp() [scheckbox.cpp:190] UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5263] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:234] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5252] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5750] UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5730] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1725] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2171] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:888] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [windowsapplication.cpp:725] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [windowsplatformapplicationmisc.cpp:129] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3220] 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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52609 in the post.