Unreal Engine Issues and Bug Tracker (UE-51889)

Description

This is a trending crash coming out of the 4.18 release. It may be a regression.

User Descriptions

Opened the sample VR-project and entered the VR-mode form the editor.
Crash in VR mode. New project with minimal assets just to test. Lasted about 30 seconds in VR mode. I'll try some other projects that were OK in 4.17. Can't think what else has changed in terms of my general setup.

Source Context

 1138       #if WITH_EDITOR || IS_PROGRAM
 1139       
 1140       // mainly concerned about the cooker here, but anyway, the editor can run without a frame for a very long time (hours) and we do not have enough lock free links. 
 1141       
 1142       /** The set of deferred cleanup objects which are pending cleanup. */
 1143       TArray<FDeferredCleanupInterface*> PendingCleanupObjectsList;
 1144       FCriticalSection PendingCleanupObjectsListLock;
 1145       
 1146       FPendingCleanupObjects::FPendingCleanupObjects()
 1147       {
 1148       	check(IsInGameThread());
 1149       	{
 1150 ***** 		FScopeLock Lock(&PendingCleanupObjectsListLock);
 1151       		Exchange(CleanupArray, PendingCleanupObjectsList);
 1152       	}
 1153       }

Steps to Reproduce

repro steps currently unknown. Related to VR Mode based on user comments.

Callstack

Assertion failed: IsInGameThread() [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp] [Line: 1149]

UE4Editor_RenderCore!FPendingCleanupObjects::FPendingCleanupObjects() [renderingthread.cpp:1151]
UE4Editor_RenderCore!FlushRenderingCommands() [renderingthread.cpp:1102]
UE4Editor_UnrealEd!FAssetThumbnailPool::ReleaseResources() [assetthumbnail.cpp:881]
UE4Editor_UnrealEd!FAssetThumbnailPool::~FAssetThumbnailPool() [assetthumbnail.cpp:823]
UE4Editor_UnrealEd!FAssetThumbnailPool::`vector deleting destructor'()
UE4Editor_LevelEditor!SLevelEditor::~SLevelEditor() [sleveleditor.cpp:278]
UE4Editor_SlateCore!FSimpleSlot::~FSimpleSlot()
UE4Editor_SlateCore!SCompoundWidget::~SCompoundWidget()
UE4Editor_SlateCore!TIndirectArray<SOverlay::FOverlaySlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:444]
UE4Editor_SlateCore!SOverlay::~SOverlay()
UE4Editor_SlateCore!TIndirectArray<SBoxPanel::FSlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:444]
UE4Editor_SlateCore!SBoxPanel::~SBoxPanel()
UE4Editor_SlateCore!FSimpleSlot::~FSimpleSlot()
UE4Editor_SlateCore!SCompoundWidget::~SCompoundWidget()
UE4Editor_SlateCore!FSlotBase::~FSlotBase() [slotbase.cpp:35]
UE4Editor_Slate!TIndirectArray<SSplitter::FSlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:445]
UE4Editor_Slate!SSplitter::~SSplitter()
UE4Editor_SlateCore!TIndirectArray<SOverlay::FOverlaySlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:444]
UE4Editor_SlateCore!SOverlay::~SOverlay()
UE4Editor_SlateCore!FSimpleSlot::~FSimpleSlot()
UE4Editor_SlateCore!SCompoundWidget::~SCompoundWidget()
UE4Editor_SlateCore!TIndirectArray<SBoxPanel::FSlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:444]
UE4Editor_SlateCore!SBoxPanel::~SBoxPanel()
UE4Editor_SlateCore!TIndirectArray<SBoxPanel::FSlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:444]
UE4Editor_SlateCore!SBoxPanel::~SBoxPanel()
UE4Editor_SlateCore!TIndirectArray<SOverlay::FOverlaySlot,FDefaultAllocator>::DestructAndFreeItems() [indirectarray.h:444]
UE4Editor_SlateCore!SOverlay::~SOverlay()
UE4Editor_SlateCore!FSimpleSlot::~FSimpleSlot()
UE4Editor_SlateCore!SCompoundWidget::~SCompoundWidget()
UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindow_RenderThread() [slaterhirenderer.cpp:874]
UE4Editor_SlateRHIRenderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FSlateRHIRenderer::DrawWindows_Private'::`29'::SlateDrawWindowsCommandName,<lambda_43e86ee7c51f39979e9a39d40b280024> > >::ExecuteTask() [taskgraphinterfaces.h:784]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:651]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:560]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:327]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:461]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]

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Fixed

Component	UE - Editor - Workflow Systems
Affects Versions	4.18
Target Fix	4.19

Fix Commit	3734244
Main Commit	3739980
Release Commit	3813083

Created	Nov 1, 2017
Resolved	Nov 2, 2017
Updated	Jan 20, 2024

View Jira Issue

UE-51889

[CrashReport] UE4Editor_RenderCore!FPendingCleanupObjects::FPendingCleanupObjects() [renderingthread.cpp:1151]

[CrashReport] UE4Editor_RenderCore!FPendingCleanupObjects::FPendingCleanupObjects() [renderingthread.cpp:1151]

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