Description

This is a trending crash coming out of the 4.17 release that also occurred with some frequency during 4.16.

User Descriptions

  • Trying to apply a material (Normal, Metallic&Roughness, and Basic)
  • I was applying a material

Source Context

 239       		// If we are the default material, must not try to fall back to the default material in an error state as that will be infinite recursion
  240       		check(!Material->IsDefaultMaterial());
  241       
  242 ***** 		return GetFallbackRenderProxy().GetMaterial(InFeatureLevel);
  243       	}
  244       
  245       	virtual FMaterial* GetMaterialNoFallback(ERHIFeatureLevel::Type InFeatureLevel) const
  246       	{
  247       		checkSlow(IsInRenderingThread());
  248       		return Material->GetMaterialResource(InFeatureLevel);
  249       	}
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: !Material->IsDefaultMaterial() [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Engine\Private\Materials\Material.cpp] [Line: 241]

UE4Editor_Engine!FDefaultMaterialInstance::GetMaterial() [material.cpp:243]
UE4Editor_Engine!FStaticMeshSceneProxy::DrawStaticElements() [staticmeshrender.cpp:742]
UE4Editor_Renderer!FPrimitiveSceneInfo::AddStaticMeshes() [primitivesceneinfo.cpp:149]
UE4Editor_Renderer!FPrimitiveSceneInfo::AddToScene() [primitivesceneinfo.cpp:204]
UE4Editor_Renderer!FScene::AddPrimitiveSceneInfo_RenderThread() [rendererscene.cpp:517]
UE4Editor_Renderer!<lambda_0628b7e343e078d62bb69bb7a0b80e2d>::operator() [rendererscene.cpp:787]
UE4Editor_Renderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FScene::AddPrimitive'::`2'::AddPrimitiveCommandName,<lambda_0628b7e343e078d62bb69bb7a0b80e2d> > >::ExecuteTask() [taskgraphinterfaces.h:784]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:650]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:559]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:325]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:459]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]

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Won't Fix
ComponentUE - Graphics Features
Affects Versions4.164.174.184.19
Target Fix4.19
CreatedAug 14, 2017
ResolvedMar 23, 2018
UpdatedApr 13, 2018