Description

This is a trending crash in the 4.17 Preview. There was one occurrence of this callstack months ago in 4.15.1, but a number of recent ones in 4.17.

User Descriptions

  • I was pressing cltr+z severl times in my character blueprint to undo some changes I made in the blueprint.

Source Context

 121       void FMallocTBB::Free( void* Ptr )
  122       {
  123       	if( !Ptr )
  124       	{
  125       		return;
  126       	}
  127       	MEM_TIME(MemTime -= FPlatformTime::Seconds())
  128       #if UE_BUILD_DEBUG || UE_BUILD_DEVELOPMENT
  129 ***** 	FMemory::Memset(Ptr, DEBUG_FILL_FREED, scalable_msize(Ptr)); 
  130       #endif
  131       	IncrementTotalFreeCalls();
  132       	scalable_free(Ptr);
  133       
  134       	MEM_TIME(MemTime += FPlatformTime::Seconds())
  135       }
Steps to Reproduce

repro steps currently unknown

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

UE4Editor_Core!rml::internal::Block::findObjectSize()
UE4Editor_Core!FMallocTBB::Free() [malloctbb.cpp:130]
UE4Editor_Core!FMemory::Free() [fmemory.inl:75]
UE4Editor_Engine!UEdGraphPin::~UEdGraphPin() [edgraphpin.cpp:1210]
UE4Editor_Engine!FPinDeletionQueue::Tick() [edgraphpin.cpp:35]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [tickableeditorobject.h:21]
UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1417]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:396]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3215]
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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Unresolved
ComponentGameplay - Blueprint
Affects Versions4.154.17
CreatedJul 25, 2017
UpdatedApr 24, 2019