This is a regular crash occurring in 4.17. It may be a regression as there is no immediate evidence of it occurring in prior releases.
Users have not provided any descriptions of their actions when the crashes occur, however one user experienced the crash in the Content Examples project.
Source Context
771 /** 772 * Finds element within the array. 773 * 774 * @param Item Item to look for. 775 * @returns Index of the found element. INDEX_NONE otherwise. 776 * @see FindLast, FindLastByPredicate 777 */ 778 int32 Find(const ElementType& Item) const 779 { 780 const ElementType* RESTRICT Start = GetData(); 781 for (const ElementType* RESTRICT Data = Start, *RESTRICT DataEnd = Data + ArrayNum; Data != DataEnd; ++Data) 782 { 783 ***** if (*Data == Item) 784 { 785 return static_cast<int32>(Data - Start); 786 } 787 } 788 return INDEX_NONE; 789 }
1. Create a blueprint based on Actor (A)
2. Add an Event Dispatcher and a Function
3. Make a new Level (B)
4. Place an instance of Actor A in level B
5. Open the Level Blueprint
6. Add a variable to the Level Blueprint of type Object Reference to A
7. Add a call to Actor A's function off of the Begin Play node
8. In the Level viewport select the instance placed in step 4.
9. Bind a PrintString node to the Event Dispatcher in the level blueprint
10. Compile and Save all blueprints
11. Make a change to Actor A's function signatures and compile it, this will trigger a recompilation of the level blueprint as well and will sometimes crash
Access violation - code c0000005 (first/second chance not available) UE4Editor_UnrealEd!TArray<TScriptDelegate<FWeakObjectPtr>,FDefaultAllocator>::Find() [array.h:784] UE4Editor_UnrealEd!TArray<TScriptDelegate<FWeakObjectPtr>,FDefaultAllocator>::AddUniqueImpl<TScriptDelegate<FWeakObjectPtr> const & __ptr64>() [array.h:1805] UE4Editor_UnrealEd!FBlueprintEditorUtils::FixLevelScriptActorBindings() [blueprinteditorutils.cpp:7068] UE4Editor_Engine!ULevel::OnLevelScriptBlueprintChanged() [level.cpp:1943] UE4Editor_Kismet!FBlueprintCompilationManagerImpl::FlushCompilationQueueImpl() [blueprintcompilationmanager.cpp:823] UE4Editor_Kismet!FBlueprintCompilationManagerImpl::CompileSynchronouslyImpl() [blueprintcompilationmanager.cpp:189] UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() [kismet2.cpp:750] UE4Editor_Kismet!FBlueprintEditor::Compile() [blueprinteditor.cpp:3291] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_Slate!FUICommandList::ExecuteAction() [uicommandlist.cpp:97] UE4Editor_Slate!SToolBarButtonBlock::OnClicked() [stoolbarbuttonblock.cpp:305] UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply() [delegateinstanceinterface.h:165] UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply() [tuple.h:497] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282] 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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| 0 |
| Component | UE - Gameplay |
|---|---|
| Affects Versions | 4.17 |
| Target Fix | 4.18 |
| Created | Aug 22, 2017 |
|---|---|
| Resolved | Oct 3, 2017 |
| Updated | Apr 27, 2018 |