This is an early trending crash in the 4.17 release. This may be a regression as there is no initial evidence of this callstack occurring in 4.16.
User Descriptions
Source Context
266 /** 267 * @return true if this object is of the specified type. 268 */ 269 #if UCLASS_FAST_ISA_COMPARE_WITH_OUTERWALK || UCLASS_FAST_ISA_IMPL == UCLASS_ISA_OUTERWALK 270 bool UObjectBaseUtility::IsA( const UClass* SomeBase ) const 271 { 272 UE_CLOG(!SomeBase, LogObj, Fatal, TEXT("IsA(NULL) cannot yield meaningful results")); 273 274 UClass* ThisClass = GetClass(); 275 276 bool bOldResult = false; 277 ***** for ( UClass* TempClass=ThisClass; TempClass; TempClass=TempClass->GetSuperClass() ) 278 { 279 if ( TempClass == SomeBase ) 280 { 281 bOldResult = true; 282 break; 283 } 284 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_CoreUObject!UObjectBaseUtility::IsA() [uobjectbaseutility.cpp:278] UE4Editor_UMG!CastChecked<UUserWidget,UObject>() [casts.h:214] UE4Editor_UMG!UWidgetAnimation::CanPossessObject() [widgetanimation.cpp:119] UE4Editor_Sequencer!FSequencer::GetHandleToObject() [sequencer.cpp:1999] UE4Editor_Sequencer!FMovieSceneTrackEditor::FindOrCreateHandleToObject() [moviescenetrackeditor.cpp:93] UE4Editor_MovieSceneTools!FKeyframeTrackEditor<UMovieScene3DTransformTrack,UMovieScene3DTransformSection,FTransformKey>::AddKeysToObjects() [keyframetrackeditor.h:95] UE4Editor_MovieSceneTools!F3DTransformTrackEditor::OnAddTransformKeys() [transformtrackeditor.cpp:767] UE4Editor_MovieSceneTools!TBaseRawMethodDelegateInstance<0,F3DTransformTrackEditor,FKeyPropertyResult __cdecl() [delegateinstancesimpl.h:556] UE4Editor_Sequencer!FMovieSceneTrackEditor::AnimatablePropertyChanged() [moviescenetrackeditor.cpp:68] UE4Editor_MovieSceneTools!F3DTransformTrackEditor::AddTransformKeys() [transformtrackeditor.cpp:758] UE4Editor_MovieSceneTools!F3DTransformTrackEditor::OnPreTransformChanged() [transformtrackeditor.cpp:337] UE4Editor_MovieSceneTools!TBaseRawMethodDelegateInstance<0,F3DTransformTrackEditor,void __cdecl() [delegateinstancesimpl.h:648] UE4Editor_UnrealEd!TBaseMulticastDelegate<void,UObject & __ptr64>::Broadcast() [delegatesignatureimpl.inl:937] UE4Editor_UnrealEd!FLevelEditorViewportClient::TrackingStarted() [leveleditorviewport.cpp:2614] UE4Editor_UnrealEd!FMouseDeltaTracker::StartTracking() [mousedeltatracker.cpp:227] UE4Editor_UnrealEd!FEditorViewportClient::StartTrackingDueToInput() [editorviewportclient.cpp:2559] UE4Editor_UnrealEd!FEditorViewportClient::InputKey() [editorviewportclient.cpp:2368] UE4Editor_UnrealEd!FLevelEditorViewportClient::InputKey() [leveleditorviewport.cpp:2518] UE4Editor_Engine!FSceneViewport::OnMouseButtonDown() [sceneviewport.cpp:482] UE4Editor_Slate!SViewport::OnMouseButtonDown() [sviewport.cpp:195] UE4Editor_Slate!<lambda_7097b900f0e4be30d80fb18f98c51ea0>::operator() [slateapplication.cpp:5104] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_7097b900f0e4be30d80fb18f98c51ea0> >() [slateapplication.cpp:232] UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [slateapplication.cpp:5093] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [slateapplication.cpp:5050] UE4Editor_Slate!FSlateApplication::OnMouseDown() [slateapplication.cpp:4968] UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1726] 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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| 1 |
| Component | UE - Anim - Sequencer |
|---|---|
| Affects Versions | 4.17 |
| Target Fix | 4.17.2, 4.18 |
| Fix Commit | 3628046 |
|---|
| Created | Aug 14, 2017 |
|---|---|
| Resolved | Sep 6, 2017 |
| Updated | Apr 27, 2018 |