This buffer overrun is probably caused by the ExportParticleDataToBlueprint module does not respecting the GPUAllocation Fixed Size setting in the module.
In fact, out-of-range export data is not correct.
Following workaround works.
const uint32 ReadbackInstanceCount = FMath::Min(*reinterpret_cast<uint32*>(Buffers[0].Key), MaxInstances);
[Link Removed]
UE4Editor-Niagara.dll!FNDIExportProxy::PostStage::__l9::<lambda>(TArrayView<TTuple<void *,unsigned int> const ,int> Buffers) Line 184 UE4Editor-Niagara.dll!Invoke(FNDIExportProxy::PostStage::__l9::void <lambda>(TArrayView<TTuple<void *,unsigned int> const ,int>) &) Line 51 UE4Editor-Niagara.dll!UE4Function_Private::TFunctionRefCaller<void <lambda>(TArrayView<TTuple<void *,unsigned int> const ,int>),void __cdecl(TArrayView<TTuple<void *,unsigned int> const ,int>)>::Call(void * Obj, TArrayView<TTuple<void *,unsigned int> const ,int> & <Params_0>) Line 549 UE4Editor-Niagara.dll!UE4Function_Private::TFunctionRefBase<UE4Function_Private::TFunctionStorage<0>,void __cdecl(TArrayView<TTuple<void *,unsigned int> const ,int>)>::operator()(TArrayView<TTuple<void *,unsigned int> const ,int>) Line 676 UE4Editor-Niagara.dll!FNiagaraGpuReadbackManager::TickInternal(bool bAssumeGpuIdle) Line 46 UE4Editor-Niagara.dll!FNiagaraGpuReadbackManager::Tick() Line 20 UE4Editor-Niagara.dll!NiagaraEmitterInstanceBatcher::PreInitViews(FRHICommandListImmediate & RHICmdList, bool bAllowGPUParticleUpdate) Line 1319 UE4Editor-Engine.dll!FFXSystemSet::PreInitViews(FRHICommandListImmediate & RHICmdList, bool bAllowGPUParticleUpdate) Line 120 UE4Editor-Renderer.dll!FSceneRenderer::PreVisibilityFrameSetup(FRHICommandListImmediate & RHICmdList) Line 3053 UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::PreVisibilityFrameSetup(FRHICommandListImmediate &) Line 4271 UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::InitViews(FRHICommandListImmediate & RHICmdList, FExclusiveDepthStencil::Type BasePassDepthStencilAccess, FILCUpdatePrimTaskData & ILCTaskData) Line 4287 UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::Render(FRHICommandListImmediate & RHICmdList) Line 1414 UE4Editor-Renderer.dll!RenderViewFamily_RenderThread(FRHICommandListImmediate & RHICmdList, FSceneRenderer * SceneRenderer) Line 3619 UE4Editor-Renderer.dll!FRendererModule::BeginRenderingViewFamily::__l35::<lambda>(FRHICommandListImmediate & RHICmdList) Line 3889 UE4Editor-Renderer.dll!TEnqueueUniqueRenderCommandType<`FRendererModule::BeginRenderingViewFamily'::`35'::FDrawSceneCommandName,void <lambda>(FRHICommandListImmediate &)>::DoTask(ENamedThreads::Type CurrentThread, const TRefCountPtr<FGraphEvent> & MyCompletionGraphEvent) Line 183 UE4Editor-Renderer.dll!TGraphTask<TEnqueueUniqueRenderCommandType<`FRendererModule::BeginRenderingViewFamily'::`35'::FDrawSceneCommandName,void <lambda>(FRHICommandListImmediate &)>>::ExecuteTask(TArray<FBaseGraphTask *,TSizedDefaultAllocator<32>> & NewTasks, ENamedThreads::Type CurrentThread) Line 886 UE4Editor-Core.dll!FBaseGraphTask::Execute(TArray<FBaseGraphTask *,TSizedDefaultAllocator<32>> & CurrentThread, ENamedThreads::Type) Line 524 UE4Editor-Core.dll!FNamedTaskThread::ProcessTasksNamedThread(int QueueIndex, bool bAllowStall) Line 709 UE4Editor-Core.dll!FNamedTaskThread::ProcessTasksUntilQuit(int QueueIndex) Line 601 UE4Editor-RenderCore.dll!RenderingThreadMain(FEvent * TaskGraphBoundSyncEvent) Line 373 UE4Editor-RenderCore.dll!FRenderingThread::Run() Line 528 UE4Editor-Core.dll!FRunnableThreadWin::Run() Line 86 UE4Editor-Core.dll!FRunnableThreadWin::GuardedRun() Line 27 kernel32.dll!00007ffdec3c7034() Unknown ntdll.dll!00007ffdeda22651() Unknown
Request a info about UE-127172 bug tracker
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-121372 in the post.
| 1 |
| Component | UE - Niagara |
|---|---|
| Affects Versions | 4.26 |
| Target Fix | 4.27.1 |
| Created | Aug 10, 2021 |
|---|---|
| Resolved | Aug 23, 2021 |
| Updated | Dec 1, 2022 |