Description

This is an early trending crash coming out of the 4.17.2 hotfix, with no record of occurring previously. The callstack is very similar to UE-47253 (fixed in 4.17.2) and may be related.

Users have not provided any descriptions of their actions when the crash occurred.

Source Context

2116       void ULandscapeInfo::RecreateLandscapeInfo(UWorld* InWorld, bool bMapCheck)
 2117       {
 2118       	check(InWorld);
 2119       
 2120       	ULandscapeInfoMap& LandscapeInfoMap = ULandscapeInfoMap::GetLandscapeInfoMap(InWorld);
 2121       	LandscapeInfoMap.Modify();
 2122       
 2123       	// reset all LandscapeInfo objects
 2124       	for (auto& LandscapeInfoPair : LandscapeInfoMap.Map)
 2125       	{
 2126       		ULandscapeInfo* LandscapeInfo = LandscapeInfoPair.Value;
 2127 ***** 		LandscapeInfo->Modify();
 2128       		LandscapeInfo->Reset();
 2129       	}
Steps to Reproduce

repro steps currently unknown

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

UE4Editor_Landscape!ULandscapeInfo::RecreateLandscapeInfo() [landscape.cpp:2128]
UE4Editor_Landscape!ALandscapeProxy::PostEditMove() [landscapeedit.cpp:3264]
UE4Editor_UnrealEd!FLevelEditorViewportClient::TrackingStopped() [leveleditorviewport.cpp:2821]
UE4Editor_UnrealEd!FMouseDeltaTracker::EndTracking() [mousedeltatracker.cpp:306]
UE4Editor_UnrealEd!FEditorViewportClient::StopTracking() [editorviewportclient.cpp:2447]
UE4Editor_UnrealEd!FEditorViewportClient::InputKey() [editorviewportclient.cpp:2382]
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()

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Fixed
ComponentTools - Landscape
Affects Versions4.17.2
Target Fix4.18
Fix Commit3671478
Release Commit3671478
CreatedSep 28, 2017
ResolvedSep 29, 2017
UpdatedApr 27, 2018