Description

This crash has started occurring in 4.15.2. It seems to be a regression from 4.15.1.

Steps to Reproduce

Reproduced internally (2/10 times) using 382.05 driver:

  1. Open Content Examples
  2. Open Blueprint Render To Target level
  3. PIE
  4. Hover crosshair over WaterSurface_BP asset
  5. Click LMB

Result:
Crash

Callstack
Access violation - code c0000005 (first/second chance not available)

UE4Editor_Core!FName::ToString() [unrealnames.cpp:901]
UE4Editor_Engine!TEnqueueUniqueRenderCommandType<`UKismetRenderingLibrary::DrawMaterialToRenderTarget'::`12'::BeginDrawEventCommandName,<lambda_006f723da97008118d513539c16ed84f> >::DoTask() [renderingthread.h:190]
UE4Editor_Engine!TGraphTask<TEnqueueUniqueRenderCommandType<`UKismetRenderingLibrary::DrawMaterialToRenderTarget'::`12'::BeginDrawEventCommandName,<lambda_006f723da97008118d513539c16ed84f> > >::ExecuteTask() [taskgraphinterfaces.h:883]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:954]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:701]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:325]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:459]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]

*Local Callstack*

Assertion failed: IsValidIndex(Index) && ChunkIndex < NumChunks && Index < MaxTotalElements [File:D:\Build\++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\Core\Public\UObject/NameTypes.h] [Line: 354] 



UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_Core!FName::GetDisplayNameEntry() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\uobject\unrealnames.cpp:895]
UE4Editor_Core!FName::ToString() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\uobject\unrealnames.cpp:901]
UE4Editor_Engine!TEnqueueUniqueRenderCommandType<`UKismetRenderingLibrary::DrawMaterialToRenderTarget'::`12'::BeginDrawEventCommandName,<lambda_006f723da97008118d513539c16ed84f> >::DoTask() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\rendercore\public\renderingthread.h:190]
UE4Editor_Engine!TGraphTask<TEnqueueUniqueRenderCommandType<`UKismetRenderingLibrary::DrawMaterialToRenderTarget'::`12'::BeginDrawEventCommandName,<lambda_006f723da97008118d513539c16ed84f> > >::ExecuteTask() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:883]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:954]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:701]
UE4Editor_RenderCore!RenderingThreadMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:325]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:459]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]

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Fixed
ComponentRendering
Affects Versions4.15.2
Target Fix4.16
Fix Commit3239767
Main Commit3239767
CreatedMay 5, 2017
ResolvedMay 12, 2017
UpdatedMay 19, 2017