Unreal Engine Issues and Bug Tracker (UE-71810)

Description

Users on the forums are hitting a crash on their initial launch of the engine into dx12. There is currently a workaround to load into the project with dx11 first, compile shaders, then youre fine to load into dx12. Very similar to an issue reported earlier [Link Removed].

Link to forum

Steps to Reproduce

Create new BP project
Add a rect light to the scene and save the level
Enable Ray Tracing in the project settings
Close the project
Open the project with -dx12

Result: Editor crashes on start
Frequency: 3/3

Callstack

 === Critical error: ===
 
 Assertion failed: ShaderRef != 0 && *ShaderRef != nullptr [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\RenderCore\Public\Shader.h] [Line: 1887] 
 Failed to find shader type FBuildRectLightMipTreeCS in Platform PCD3D_SM5
 
 
 [Callstack] 0x00007fff0c455549 KERNELBASE.dll!UnknownFunction []
 [Callstack] 0x00007ffeae5b1607 UE4Editor-Core.dll!ReportAssert() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowsplatformcrashcontext.cpp:551]
 [Callstack] 0x00007ffeae5b3db7 UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [d:\build\++ue4\sync\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:79]
 [Callstack] 0x00007ffeae3c720a UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
 [Callstack] 0x00007ffeae34f367 UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:440]
 [Callstack] 0x00007ffeae34f9f9 UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:418]
 [Callstack] 0x00007ffe9c828ed8 UE4Editor-Engine.dll!DispatchCheckVerify<void,<lambda_27e8da042b46d77eec5127ab21bf535b> >() [d:\build\++ue4\sync\engine\source\runtime\core\public\misc\assertionmacros.h:161]
 [Callstack] 0x00007ffe9b667e5c UE4Editor-Engine.dll!BuildRectLightMipTree() [d:\build\++ue4\sync\engine\source\runtime\engine\private\components\rectlightcomponent.cpp:389]
 [Callstack] 0x00007ffe9b6ab9b0 UE4Editor-Engine.dll!URectLightComponent::UpdateRayTracingData() [d:\build\++ue4\sync\engine\source\runtime\engine\private\components\rectlightcomponent.cpp:37]
 [Callstack] 0x00007ffe9b65927c UE4Editor-Engine.dll!URectLightComponent::URectLightComponent() [d:\build\++ue4\sync\engine\source\runtime\engine\private\components\rectlightcomponent.cpp:69]
 [Callstack] 0x00007ffeaebf612f UE4Editor-CoreUObject.dll!UClass::CreateDefaultObject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:3076]
 [Callstack] 0x00007ffeaee05e77 UE4Editor-CoreUObject.dll!FObjectInitializer::CreateDefaultSubobject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:3656]
 [Callstack] 0x00007ffeaed63bb8 UE4Editor-CoreUObject.dll!UObject::CreateDefaultSubobject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:107]
 [Callstack] 0x00007ffe9ba2b451 UE4Editor-Engine.dll!ALight::ALight() [d:\build\++ue4\sync\engine\source\runtime\engine\private\light.cpp:19]
 [Callstack] 0x00007ffe9be62011 UE4Editor-Engine.dll!ARectLight::ARectLight() [d:\build\++ue4\sync\engine\source\runtime\engine\private\rectlight.cpp:7]
 [Callstack] 0x00007ffeaebf612f UE4Editor-CoreUObject.dll!UClass::CreateDefaultObject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:3076]
 [Callstack] 0x00007ffeaee30f96 UE4Editor-CoreUObject.dll!UObjectLoadAllCompiledInDefaultProperties() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:789]
 [Callstack] 0x00007ffeaee1ed8f UE4Editor-CoreUObject.dll!ProcessNewlyLoadedUObjects() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:869]
 [Callstack] 0x00007ff68023cf44 UE4Editor.exe!FEngineLoop::PreInit() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2359]
 [Callstack] 0x00007ff680235377 UE4Editor.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:129]
 [Callstack] 0x00007ff6802355ca UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
 [Callstack] 0x00007ff68024315c UE4Editor.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:275]
 [Callstack] 0x00007ff680245b7e UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\3\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
 [Callstack] 0x00007fff0fa581f4 KERNEL32.DLL!UnknownFunction []
 [Callstack] 0x00007fff0fe4a251 ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Rendering Architecture - RHI
Affects Versions	4.22
Target Fix	4.22

Fix Commit	5491427
Main Commit	5491427
Release Commit	5491425

Created	Mar 20, 2019
Resolved	Mar 21, 2019
Updated	Apr 4, 2019

View Jira Issue

UE-71810

Crash when launching dx12 for the first time with Rect Lights

Crash when launching dx12 for the first time with Rect Lights

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