[UE5.2, Bug report] Editor crash when PC is idle for a while. Out of memory.

[Roy_Wierer.Seda145]

System has plenty of memory. Happens in an idle state.

Fatal error: [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\GenericPlatform\GenericPlatformMemory.cpp] [Line: 241] Ran out of memory allocating 131436 bytes with alignment 0. Last error msg: The paging file is too small for this operation to complete..

UnrealEditor_Core!<lambda_2f7b765a738be9e3beac65d9eaf9a7a2>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\GenericPlatform\GenericPlatformMemory.cpp:242]
UnrealEditor_Core!FGenericPlatformMemory::OnOutOfMemory() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\GenericPlatform\GenericPlatformMemory.cpp:244]
UnrealEditor_Core!FMallocMimalloc::OutOfMemory() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\HAL\MallocMimalloc.h:52]
UnrealEditor_Core!FMallocMimalloc::Malloc() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\MallocMimalloc.cpp:69]
UnrealEditor_Core!FMemory::Malloc() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\HAL\FMemory.inl:30]
UnrealEditor_Renderer!TConcurrentLinearArrayAllocator<FSceneRenderingBlockAllocationTag>::ForElementType<FShadowMapCacheData>::ResizeAllocation() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Experimental\ConcurrentLinearAllocator.h:600]
UnrealEditor_Renderer!SetCacheDataShaderParameters() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VirtualShadowMaps\VirtualShadowMapArray.cpp:407]
UnrealEditor_Renderer!FVirtualShadowMapArray::BuildPageAllocations() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VirtualShadowMaps\VirtualShadowMapArray.cpp:1671]
UnrealEditor_Renderer!FDeferredShadingSceneRenderer::Render() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\DeferredShadingRenderer.cpp:3599]
UnrealEditor_Renderer!RenderViewFamilies_RenderThread() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:4413]
UnrealEditor_Renderer!<lambda_3332acdaafdbf3c437080709986d7e10>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:4681]
UnrealEditor_Renderer!TEnqueueUniqueRenderCommandType<`FRendererModule::BeginRenderingViewFamilies'::`87'::FDrawSceneCommandName,<lambda_3332acdaafdbf3c437080709986d7e10> >::DoTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\RenderCore\Public\RenderingThread.h:209]
UnrealEditor_Renderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FRendererModule::BeginRenderingViewFamilies'::`87'::FDrawSceneCommandName,<lambda_3332acdaafdbf3c437080709986d7e10> > >::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:1310]
UnrealEditor_Core!FNamedTaskThread::ProcessTasksNamedThread() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:758]
UnrealEditor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:649]
UnrealEditor_RenderCore!RenderingThreadMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:416]
UnrealEditor_RenderCore!FRenderingThread::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:542]
UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:149]

[Roy_Wierer.Seda145]

It appears a mostly empty project opened in the UE editor process nuked the system after letting it do nothing for hours.

Windows successfully diagnosed a low virtual memory condition. The following programs consumed the most virtual memory: UnrealEditor.exe (5872) consumed 51417583616 bytes

I remember something similar happened in the past when you would set a blueprint breakpoint and let the process hang on that but I wasn’t debugging and wasn’t running anything, not even PIE.

[RayChow_OoO]

how to fix it？

[Roy_Wierer.Seda145]

I have no fix, this is only a report. It seems to happen when you let the editor run on idle (not using it) for a while, up to hours. Unclear if this is caused by the idle state or is just a generic memory leak. Don’t have problems when I’m using it actively.

[RayChow_OoO]

Memory leak in 5.2

Hey, we also encountered a memory leak that seems to be caused by viewport rendering, also in packaged games (but we didn’t test shipping builds). Can you please add the following line to your DefaultEngine.ini file and see if it’s still leaking (preferably under RendererSettings)? r.gpucrash.collectionenable=0 It seems to be important to add this line to the ini and not enter it at runtime. I guess this is not a fix, but it can help narrow the issue down and maybe help epic fix the issue pr…

this show how to fix it!

[Roy_Wierer.Seda145]

Thank you for this I can’t verify it right now, I’m not working with the editor itself for a while.