# Repeated crashes linked to RayTracing ? **URL:** \ **Category:** Rendering\ **Tags:** unreal-engine, Ray-Tracing, crash, dx12, question\ **Created:** [May 18, 2025, 12:58pm UTC](https://forums.unrealengine.com/t/repeated-crashes-linked-to-raytracing/2516519 "2025-05-18T12:58:55Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Data\_Vision](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/data_vision/32/1118730_2.png) [@Data\_Vision](https://forums.unrealengine.com/u/Data_Vision)\ **Post date:** [May 18, 2025, 12:58pm UTC](https://forums.unrealengine.com/t/repeated-crashes-linked-to-raytracing/2516519/1 "2025-05-18T12:58:55Z")
Hi, i’ve been having lots of crashes in my recent cinematic project, linked to ray tracing. Sometimes i get handled ensures messages, and sometimes it just crashes. Rendering via MRQ sometimes fails, and almost always fails the second time i launch a render, forcing me to relaunch each time i render. I’d love to get more detailed info about it, i haven’t been able to pinpoint which raytracing feature is causing trouble, as i’m utilizing almost all of them ? UE 5.5.4 RTX5090 with latest drivers Hardware RT, DX12 SM6 Nanite Lumen Hit Lighting Ray Traced Translucency Ray Traced Shadows Here are the messages i gathered : ```auto Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000008 UnrealEditor_Renderer!FRayTracingSBTAllocation::GetSegmentCount() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\RayTracing\RayTracingShaderBindingTable.cpp:26] UnrealEditor_Renderer!`FComputeShaderUtils::AddPass'::`2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\RayTracing\RayTracing.cpp:1179] UnrealEditor_Renderer!`FComputeShaderUtils::AddPass'::`2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\ParallelFor.h:116] UnrealEditor_Renderer!LowLevelTasks::TTaskDelegate::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`ParallelForImpl::ParallelForInternal,`ParallelFor'::`2'::,std::nullp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:171] UnrealEditor_Core!LowLevelTasks::FTask::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:627] UnrealEditor_Core!LowLevelTasks::FScheduler::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:245] UnrealEditor_Core!LowLevelTasks::FScheduler::WorkerLoop() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:514] UnrealEditor_Core!`LowLevelTasks::FScheduler::CreateWorker'::`2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:75] UnrealEditor_Core!FThreadImpl::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:69] UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:159] ``` ```auto GPU Crash dump Triggered UnrealEditor_D3D12RHI!FD3D12DynamicRHI::TerminateOnGPUCrash() [D:\build\++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Util.cpp:961] UnrealEditor_D3D12RHI!FD3D12DeferredInitView::CreateViews'::2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Submission.cpp:1271] UnrealEditor_D3D12RHI!FD3D12DynamicRHI::ForEachQueue() [D:\build\++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12RHI.cpp:274] UnrealEditor_D3D12RHI!FD3D12DynamicRHI::ProcessInterruptQueue() [D:\build\++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Submission.cpp:1433] UnrealEditor_D3D12RHI!FD3D12Thread::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Submission.cpp:97] UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:159] ``` ```auto LogOutputDevice: Error: === Handled ensure: === LogOutputDevice: Error: Ensure condition failed: RTLODData.SBTAllocation [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\RayTracing\RayTracing.cpp] [Line: 1120] LogOutputDevice: Error: Stack: LogOutputDevice: Error: [Callstack] 0x00007ffc618cc5f2 UnrealEditor-Renderer.dll!FComputeShaderUtils::AddPass'::2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\RayTracing\RayTracing.cpp:1120] LogOutputDevice: Error: [Callstack] 0x00007ffc618ce594 UnrealEditor-Renderer.dll!FComputeShaderUtils::AddPass'::2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\ParallelFor.h:116] LogOutputDevice: Error: [Callstack] 0x00007ffc618dc161 UnrealEditor-Renderer.dll!LowLevelTasks::TTaskDelegate::TTaskDelegateImpl,ParallelFor'::2'::,std::nullptr_t>'::2'::FParallelExecutor>'::13'::,0>::Call() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:171] LogOutputDevice: Error: [Callstack] 0x00007ffc74efee35 UnrealEditor-Core.dll!LowLevelTasks::FTask::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:627] LogOutputDevice: Error: [Callstack] 0x00007ffc74efeb6f UnrealEditor-Core.dll!LowLevelTasks::FScheduler::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:245] LogOutputDevice: Error: [Callstack] 0x00007ffc74f261ad UnrealEditor-Core.dll!LowLevelTasks::FScheduler::WorkerLoop() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:514] LogOutputDevice: Error: [Callstack] 0x00007ffc74eeb0d6 UnrealEditor-Core.dll!LowLevelTasks::FScheduler::CreateWorker'::2'::::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:75] LogOutputDevice: Error: [Callstack] 0x00007ffc750f7e23 UnrealEditor-Core.dll!FThreadImpl::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:69] LogOutputDevice: Error: [Callstack] 0x00007ffc7554c0ad UnrealEditor-Core.dll!FRunnableThreadWin::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:159] LogOutputDevice: Error: [Callstack] 0x00007ffc755435cf UnrealEditor-Core.dll!FRunnableThreadWin::GuardedRun() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:79] LogOutputDevice: Error: [Callstack] 0x00007ffd3ba07374 KERNEL32.DLL!UnknownFunction [] LogOutputDevice: Error: [Callstack] 0x00007ffd3bebcc91 ntdll.dll!UnknownFunction [] ```