Steps to Reproduce
  • run attached project in standalone game mode
  • hit 'enter' to switch to fullscreen 1080p
  • alt-tab out of the process
  • process will crash

OR

  • Create a new project
  • Set it to run DX12
  • Launch in Standalone game mode (-game or through editor)
  • switch to 1080p from the console (r.setres 1920x1080f)
  • alt-tab out of the process
  • process will crash

 

Callstack

UE4Editor_D3D12RHI!D3D12RHI::VerifyD3D12Result() [d:\build\++ue4\sync\engine\source\runtime\d3d12rhi\private\d3d12util.cpp:263]
UE4Editor_D3D12RHI!FD3D12Viewport::PresentChecked() [d:\build\++ue4\sync\engine\source\runtime\d3d12rhi\private\d3d12viewport.cpp:553]
UE4Editor_D3D12RHI!FD3D12Viewport::Present() [d:\build\++ue4\sync\engine\source\runtime\d3d12rhi\private\d3d12viewport.cpp:741]
UE4Editor_D3D12RHI!FD3D12CommandContextBase::RHIEndDrawingViewport() [d:\build\++ue4\sync\engine\source\runtime\d3d12rhi\private\d3d12viewport.cpp:886]
UE4Editor_RHI!FRHICommand<FRHICommandEndDrawingViewport,FRHICommandEndDrawingViewportString1859>::ExecuteAndDestruct() [d:\build\++ue4\sync\engine\source\runtime\rhi\public\rhicommandlist.h:726]
UE4Editor_RHI!FRHICommandListExecutor::ExecuteInner_DoExecute() [d:\build\++ue4\sync\engine\source\runtime\rhi\private\rhicommandlist.cpp:351]
UE4Editor_RHI!FExecuteRHIThreadTask::DoTask() [d:\build\++ue4\sync\engine\source\runtime\rhi\private\rhicommandlist.cpp:410]
UE4Editor_RHI!TGraphTask<FExecuteRHIThreadTask>::ExecuteTask() [d:\build\++ue4\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:847]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\build\++ue4\sync\engine\source\runtime\core\private\async\taskgraph.cpp:686]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\build\++ue4\sync\engine\source\runtime\core\private\async\taskgraph.cpp:583]
UE4Editor_RenderCore!FRHIThread::Run() [d:\build\++ue4\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:289]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:96]

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Fixed
ComponentRendering - RHI
Affects Versions4.24.1
Target Fix4.25
Fix Commit12470734
Main Commit14151001
Release Commit12470734
CreatedDec 19, 2019
ResolvedMar 27, 2020
UpdatedAug 20, 2020