Unreal Engine Issues and Bug Tracker (UE-72042)

Description

As part of RecreateClothingActors(), the master pose component is not checked for a valid mesh and therefore when TransformComponent->GetComponentSpaceTransforms() is indexed into, crashes can occur.

Steps to Reproduce

Create two skeletal mesh components, one with a cloth setup using the other as its master pose component.

Set a valid mesh for the cloth skeletal mesh component, but not for the master.

During component registration call RecreateClothingActors().

Results in a Crash

Callstack

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 611] 
Array index out of bounds: 0 from an array of size 0

KERNELBASE.dll!UnknownFunction []
UE4Editor-Core.dll!ReportAssert() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowsplatformcrashcontext.cpp:553]
UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:79]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
UE4Editor-Core.dll!AssertFailedImplV() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:101]
UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:439]
UE4Editor-ClothingSystemRuntime.dll!DispatchCheckVerify<void,<lambda_772c629cba1e4a100b11566d43231efa> >() [d:\build\++ue4\sync\engine\source\runtime\core\public\misc\assertionmacros.h:162]
UE4Editor-ClothingSystemRuntime.dll!FClothingSimulationNv::UpdateLod() [d:\build\++ue4\sync\engine\source\runtime\clothingsystemruntime\private\clothingsimulationnv.cpp:1124]
UE4Editor-ClothingSystemRuntime.dll!FClothingSimulationNv::CreateActor() [d:\build\++ue4\sync\engine\source\runtime\clothingsystemruntime\private\clothingsimulationnv.cpp:237]
UE4Editor-Engine.dll!USkeletalMeshComponent::RecreateClothingActors() [d:\build\++ue4\sync\engine\source\runtime\engine\private\skeletalmeshcomponentphysics.cpp:2345]
UE4Editor-Repro_UE72042.dll!UMyBlueprintFunctionLibrary::execRecreateClothing() [c:\users\mason.seay\desktop\repro_ue72042 4.22\source\repro_ue72042\myblueprintfunctionlibrary.h:16]
UE4Editor-CoreUObject.dll!UFunction::Invoke() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:4643]
UE4Editor-CoreUObject.dll!UObject::CallFunction() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:904]
UE4Editor-CoreUObject.dll!UObject::ProcessContextOpcode() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2314]
UE4Editor-CoreUObject.dll!UObject::execLetBool() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2216]
UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:974]
UE4Editor-CoreUObject.dll!ProcessScriptFunction<void (__cdecl*)(UObject *,FFrame &,void *)>() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:809]
UE4Editor-CoreUObject.dll!ProcessLocalFunction() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1033]
UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:974]
UE4Editor-CoreUObject.dll!UObject::ProcessInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1058]
UE4Editor-CoreUObject.dll!UFunction::Invoke() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:4643]
UE4Editor-CoreUObject.dll!UObject::ProcessEvent() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1464]
UE4Editor-Engine.dll!AActor::ProcessEvent() [d:\build\++ue4\sync\engine\source\runtime\engine\private\actor.cpp:769]
UE4Editor-Engine.dll!AActor::BeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\actor.cpp:3383]
UE4Editor-Engine.dll!AActor::DispatchBeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\actor.cpp:3343]
UE4Editor-Engine.dll!AWorldSettings::NotifyBeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\worldsettings.cpp:253]
UE4Editor-Engine.dll!AGameStateBase::HandleBeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\gamestatebase.cpp:177]
UE4Editor-Engine.dll!UWorld::BeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\world.cpp:3948]
UE4Editor-Engine.dll!UGameInstance::StartPlayInEditorGameInstance() [d:\build\++ue4\sync\engine\source\runtime\engine\private\gameinstance.cpp:413]
UE4Editor-UnrealEd.dll!UEditorEngine::CreatePIEGameInstance() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:3341]
UE4Editor-UnrealEd.dll!UEditorEngine::PlayInEditor() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:2466]
UE4Editor-UnrealEd.dll!UEditorEngine::StartQueuedPlayMapRequest() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:1280]
UE4Editor-UnrealEd.dll!UEditorEngine::Tick() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorengine.cpp:1532]
UE4Editor-UnrealEd.dll!UUnrealEdEngine::Tick() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:403]
UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3967]
UE4Editor.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:168]
UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:275]
UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\3\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Simulation - Physics - Character
Affects Versions	4.21
Target Fix	4.23

Fix Commit	7107801
Main Commit	7107819
Release Commit	7107801

Created	Mar 27, 2019
Resolved	Jun 20, 2019
Updated	Feb 11, 2020

View Jira Issue

UE-72042

Crash in RecreateClothingActors() when using MasterPoseComponent

Crash in RecreateClothingActors() when using MasterPoseComponent

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