Description

Projects crash when the following Project Settings are set:
• Vulkan is enabled
• Vulkan is the Default RHI
• Forward Shading is enabled
• AntiAliasing Method is set to MSAA

The different engine versions had slightly different results.
423
It doesn't crash, but on projec reopen it crashes during or after shader compilation.

424
Crashed when I set AntiAliasing to MSAA. The project will not reopen.

425
Crashed when I actually closed the prohect. The project will not reopen.

Found in 4.24 CL#10757647
Reproduced in 4.23.1 CL#9631420, 4.25 Main CL#10868506

Steps to Reproduce

1. Create a blank project.
2. Open Project settings.
3. Go to Platform Windows-Targeted RHIs and enable Vuklan(SM5) and set Default RHI to Vulkan.
4. Restart the engine.
5. Go to Platform Engine - Rendering and enable Forward Shading and set AntiAliasing Method to MSAA.

Result: The engine crashes in slightly different ways depending on engine version (check Description).

Expected: No engine crash.

Callstack

LoginId:9a8d08644d702ac44f074090ac311686
EpicAccountId:580fb2844ad145d79dff08f42acea7c6

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000009c

UE4Editor_VulkanRHI!FVulkanDynamicRHI::RHICreateGraphicsPipelineState() [d:\build\++ue4\sync\engine\source\runtime\vulkanrhi\private\vulkanpipeline.cpp:1805]
UE4Editor_RHI!FCompilePipelineStateTask::DoTask() [d:\build\++ue4\sync\engine\source\runtime\rhi\private\pipelinestatecache.cpp:792]
UE4Editor_RHI!TGraphTask<FCompilePipelineStateTask>::ExecuteTask() [d:\build\++ue4\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:847]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasks() [d:\build\++ue4\sync\engine\source\runtime\core\private\async\taskgraph.cpp:1029]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasksUntilQuit() [d:\build\++ue4\sync\engine\source\runtime\core\private\async\taskgraph.cpp:855]
UE4Editor_Core!FTaskThreadAnyThread::Run() [d:\build\++ue4\sync\engine\source\runtime\core\private\async\taskgraph.cpp:931]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:96]

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Unresolved
ComponentRendering
Affects Versions4.23.14.244.25
Target Fix4.25
CreatedDec 23, 2019
UpdatedFeb 19, 2020