Description

Crash occurs when selecting all actors and pressing "End" to snap them to the floor. This doesn't occur if you create a blank map and add a few actors to it. The specific conditions may need to be further narrowed down by QA.

This is a common and longstanding crash that has occurred since at least 4.13 and affected more than 180 users.

User Descriptions

  • I was snapping multiple items to the item below (floor and walls) with END.
  • I selected everything on the scene. It was a very very small scene.
  • selected all objects and hit "end" to snap to ground

Source Context

 4921       		// Forces a line trace.
 4922       		Extent = FVector::ZeroVector;
 4923       		LocationOffset = StartLocation - Object.GetWorldLocation();
 4924       	}
 4925       	else 
 4926       	{
 4927 ***** 		StartLocation = Object.GetBounds().Origin;
 4928       
 4929       		Extent = Object.GetBounds().BoxExtent;
 4930       		LocationOffset = StartLocation - Object.GetWorldLocation();
 4931       	}
Steps to Reproduce
  1. Open the editor to a map with multiple actors (I used StarterContent > Maps > "Minimal_Default" map)
  2. Press Ctrl-A to select all actors
  3. Press End to snap to floor

Result: Crash

Callstack
Access violation - code c0000005 (first/second chance not available)

UE4Editor_UnrealEd!UEditorEngine::SnapObjectTo() [editorserver.cpp:4911]
UE4Editor_LevelEditor!FLevelEditorActionCallbacks::SnapTo_Clicked() [leveleditoractions.cpp:2871]
UE4Editor_LevelEditor!FLevelEditorActionCallbacks::SnapToFloor_Clicked() [leveleditoractions.cpp:2816]
UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027]
UE4Editor_Slate!FUICommandList::ConditionalProcessCommandBindings() [uicommandlist.cpp:216]
UE4Editor_Slate!FUICommandList::ProcessCommandBindings() [uicommandlist.cpp:160]
UE4Editor_UnrealEd!SEditorViewport::OnKeyDown() [seditorviewport.cpp:109]
UE4Editor_LevelEditor!SLevelViewport::OnKeyDown() [slevelviewport.cpp:444]
UE4Editor_Slate!<lambda_2afcd964c763e269e2d1a63f3a72f846>::operator() [slateapplication.cpp:4630]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_2afcd964c763e269e2d1a63f3a72f846> >() [slateapplication.cpp:239]
UE4Editor_Slate!FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_2afcd964c763e269e2d1a63f3a72f846>,FKeyEvent>() [slateapplication.cpp:221]
UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() [slateapplication.cpp:4628]
UE4Editor_Slate!FSlateApplication::OnKeyDown() [slateapplication.cpp:4541]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1539]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:714]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3058]
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()

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-48996 in the post.

0
Login to Vote

Fixed
ComponentTools
Affects Versions4.134.144.154.164.17
Target Fix4.18
Fix Commit3618373
Main Commit3621569
Release Commit3643070
CreatedAug 29, 2017
ResolvedAug 30, 2017
UpdatedApr 27, 2018
View Jira Issue