Unreal Engine Issues

UE-80268

Crash When Enabling SSAO Smoothing with MSAA Enabled

Crash When Enabling SSAO Smoothing with MSAA Enabled

Description

The Editor is crashing when enabling SSAO while MSAA is enabled. 

Found in 4.23 CL# 8386587 and 4.24 CL# 8569829

Steps to Reproduce
  1. Open the Editor
  2. Enable Forward shading and set Anti-aliasing to MSAA
  3. Restart the Editor
  4. In the console set r.AmbientOcclusion.Compute and r.AmbientOcclusion.Compute.Smooth to 1

Results:

The Editor will crash

Expected:
No crash would occur

Callstack
Unhandled exception

UE4Editor_Renderer!FRCPassPostProcessAmbientOcclusion::ComputeOutputDesc() [d:\jeremymain\engine\source\runtime\renderer\private\compositionlighting\postprocessambientocclusion.cpp:1131]
UE4Editor_Renderer!FRenderingCompositionGraph::RecursivelyProcess() [d:\jeremymain\engine\source\runtime\renderer\private\postprocess\renderingcompositiongraph.cpp:559]
UE4Editor_Renderer!FRenderingCompositePassContext::Process() [d:\jeremymain\engine\source\runtime\renderer\private\postprocess\renderingcompositiongraph.cpp:269]
UE4Editor_Renderer!FCompositionLighting::ProcessBeforeBasePass() [d:\jeremymain\engine\source\runtime\renderer\private\compositionlighting\compositionlighting.cpp:250]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [d:\jeremymain\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:1330]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [d:\jeremymain\engine\source\runtime\renderer\private\scenerendering.cpp:3385]
UE4Editor_Renderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FRendererModule::BeginRenderingViewFamily'::`27'::FDrawSceneCommandName,<lambda_98974a148448e2faeb6b39d7ee44228d> > >::ExecuteTask() [d:\jeremymain\engine\source\runtime\core\public\async\taskgraphinterfaces.h:847]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\jeremymain\engine\source\runtime\core\private\async\taskgraph.cpp:686]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\jeremymain\engine\source\runtime\core\private\async\taskgraph.cpp:583]
UE4Editor_RenderCore!RenderingThreadMain() [d:\jeremymain\engine\source\runtime\rendercore\private\renderingthread.cpp:340]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\jeremymain\engine\source\runtime\rendercore\private\renderingthread.cpp:471]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\jeremymain\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:96]

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Won't Fix
ComponentUE - Graphics Features
Affects Versions4.23, 4.24
CreatedSep 12, 2019
ResolvedAug 27, 2021
UpdatedAug 27, 2021
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