This is a trending crash coming out of 4.18 and may be a regression. Users have not provided any descriptions of their actions when the crash occurred.
Source Context
72 /** 73 * Removes all functions from this multi-cast delegate's invocation list that are bound to the specified UserObject. 74 * Note that the order of the delegates may not be preserved! 75 * 76 * @param InUserObject The object to remove all delegates for. 77 */ 78 void RemoveAll( const void* InUserObject ) 79 { 80 ***** if (InvocationListLockCount > 0) 81 { 82 bool NeedsCompacted = false; 83 for (FDelegateBase& DelegateBaseRef : InvocationList) 84 { 85 IDelegateInstance* DelegateInstance = DelegateBaseRef.GetDelegateInstanceProtected(); 86 if ((DelegateInstance != nullptr) && DelegateInstance->HasSameObject(InUserObject)) 87 { 88 // Manually unbind the delegate here so the compaction will find and remove it. 89 DelegateBaseRef.Unbind(); 90 NeedsCompacted = true; 91 } 92 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_WorldBrowser!FMulticastDelegateBase<FWeakObjectPtr>::RemoveAll() [multicastdelegatebase.h:81] UE4Editor_WorldBrowser!FLevelCollectionModel::OnLevelRemovedFromWorld() [levelcollectionmodel.cpp:1889] UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,FLevelCollectionModel,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,FLevelCollectionModel,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_Engine!TBaseMulticastDelegate<void,ULevel * __ptr64,UWorld * __ptr64>::Broadcast() [delegatesignatureimpl.inl:937] UE4Editor_Engine!UWorld::RemoveFromWorld() [world.cpp:2397] UE4Editor_Engine!UWorld::UpdateLevelStreamingInner() [world.cpp:2875] UE4Editor_Engine!UWorld::UpdateLevelStreaming() [world.cpp:2918] UE4Editor_Engine!UWorld::FlushLevelStreaming() [world.cpp:2952] UE4Editor_WorldBrowser!FWorldTileModel::LoadLevel() [worldtilemodel.cpp:615] UE4Editor_WorldBrowser!FLevelCollectionModel::LoadLevels() [levelcollectionmodel.cpp:591] UE4Editor_WorldBrowser!FLevelModel::MakeLevelCurrent() [levelmodel.cpp:307] UE4Editor_WorldBrowser!WorldHierarchy::FLevelModelTreeItem::MakeCurrent() [worldtreeitemtypes.cpp:257] UE4Editor_WorldBrowser!SWorldHierarchyImpl::OnTreeViewMouseButtonDoubleClick() [sworldhierarchyimpl.cpp:783] UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,SWorldHierarchyImpl,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,SWorldHierarchyImpl,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_WorldBrowser!TBaseDelegate<void,TSharedPtr<WorldHierarchy::IWorldTreeItem,0> >::ExecuteIfBound() [delegatesignatureimpl.inl:624] UE4Editor_WorldBrowser!SListView<TSharedPtr<WorldHierarchy::IWorldTreeItem,0> >::Private_OnItemDoubleClicked() [slistview.h:805] UE4Editor_WorldBrowser!STableRow<TSharedPtr<WorldHierarchy::IWorldTreeItem,0> >::OnMouseButtonDoubleClick() [stablerow.h:288] UE4Editor_Slate!<lambda_eeb33fd1b480e3cad58a1531d90d2e14>::operator() [slateapplication.cpp:5695] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_eeb33fd1b480e3cad58a1531d90d2e14> >() [slateapplication.cpp:234] UE4Editor_Slate!FSlateApplication::RoutePointerDoubleClickEvent() [slateapplication.cpp:5693] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [slateapplication.cpp:5680] UE4Editor_Slate!FSlateApplication::OnMouseDoubleClick() [slateapplication.cpp:5656] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1729] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2171] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:888] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [windowsapplication.cpp:725] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [windowsplatformapplicationmisc.cpp:129] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3220] 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 - World Creation - Worldbuilding Tools - World Composition |
|---|---|
| Affects Versions | 4.18 |
| Target Fix | 4.18.1 |
| Fix Commit | 3737791 |
|---|
| Created | Nov 2, 2017 |
|---|---|
| Resolved | Nov 6, 2017 |
| Updated | Apr 27, 2018 |
| 4447 - klorberg |