This is an infrequent crash coming out of the 4.17 release.
User Descriptions
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:262] UE4Editor_MeshPaint!MeshPaintHelpers::ApplyVertexColorsToAllLODs() [meshpainthelpers.cpp:1177] UE4Editor_MeshPaintMode!FPaintModePainter::ActorDeselected() [paintmodepainter.cpp:643] UE4Editor_MeshPaint!IMeshPaintEdMode::Select() [imeshpaintmode.cpp:422] UE4Editor_UnrealEd!UUnrealEdEngine::SelectActor() [editorselectutils.cpp:558] UE4Editor_UnrealEd!UUnrealEdEngine::SelectNone() [editorselectutils.cpp:869] UE4Editor_UnrealEd!ClickHandlers::ClickActor() [levelviewportclickhandlers.cpp:277] UE4Editor_UnrealEd!FLevelEditorViewportClient::ProcessClick() [leveleditorviewport.cpp:1966] UE4Editor_UnrealEd!FEditorViewportClient::ProcessClickInViewport() [editorviewportclient.cpp:2618] UE4Editor_UnrealEd!FEditorViewportClient::InputKey() [editorviewportclient.cpp:2380] UE4Editor_UnrealEd!FLevelEditorViewportClient::InputKey() [leveleditorviewport.cpp:2518] UE4Editor_Engine!FSceneViewport::OnMouseButtonUp() [sceneviewport.cpp:575] UE4Editor_Slate!SViewport::OnMouseButtonUp() [sviewport.cpp:200] UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5199] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:232] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5188] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5690] UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5670] UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1718] UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161] UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881] UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151] 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-48988 in the post.