XRSystem.ReleaseFrame() was not called error with particle system lights (HDRP 6.9)

After updating to Unity 2019.2 and HDRP 6.9, I'm finding that any time I spawn a particle that has a light attached to it, it results in rendering locking up for the duration of the particle's lifetime, and the following errors getting spammed to the log:

Spoiler: Errors

Error 1:
XRSystem.ReleaseFrame() was not called!
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

Error 2:
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Experimental.Rendering.HDPipeline.HDRenderPipeline.PrepareLightsForGPU (UnityEngine.Rendering.CommandBuffer cmd, UnityEngine.Experimental.Rendering.HDPipeline.HDCamera hdCamera, UnityEngine.Rendering.CullingResults cullResults, UnityEngine.Experimental.Rendering.HDPipeline.HDProbeCullingResults hdProbeCullingResults, UnityEngine.Experimental.Rendering.HDPipeline.DensityVolumeList densityVolumes, UnityEngine.Experimental.Rendering.HDPipeline.DebugDisplaySettings debugDisplaySettings, UnityEngine.Experimental.Rendering.HDPipeline.AOVRequestData aovRequest) (at Library/PackageCache/com.unity.render-pipelines.high-definition@6.9.1-preview/Runtime/Lighting/LightLoop/LightLoop.cs:1818)
UnityEngine.Experimental.Rendering.HDPipeline.HDRenderPipeline.ExecuteRenderRequest (UnityEngine.Experimental.Rendering.HDPipeline.HDRenderPipeline+RenderRequest renderRequest, UnityEngine.Rendering.ScriptableRenderContext renderContext, UnityEngine.Rendering.CommandBuffer cmd, UnityEngine.Experimental.Rendering.HDPipeline.AOVRequestData aovRequest) (at Library/PackageCache/com.unity.render-pipelines.high-definition@6.9.1-preview/Runtime/RenderPipeline/HDRenderPipeline.cs:1607)
UnityEngine.Experimental.Rendering.HDPipeline.HDRenderPipeline.Render (UnityEngine.Rendering.ScriptableRenderContext renderContext, UnityEngine.Camera[] cameras) (at Library/PackageCache/com.unity.render-pipelines.high-definition@6.9.1-preview/Runtime/RenderPipeline/HDRenderPipeline.cs:1452)
UnityEngine.Rendering.RenderPipeline.InternalRender (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Camera[] cameras) (at C:/buildslave/unity/build/Runtime/Export/RenderPipeline/RenderPipeline.cs:72)
UnityEngine.Rendering.RenderPipelineManager.DoRenderLoop_Internal (UnityEngine.Rendering.RenderPipelineAsset pipe, UnityEngine.Camera[] cameras, System.IntPtr loopPtr, Unity.Collections.LowLevel.Unsafe.AtomicSafetyHandle safety) (at C:/buildslave/unity/build/Runtime/Export/RenderPipeline/RenderPipelineManager.cs:67)

Is this a known issue? Is there any way to work around this?

 

This is easy to reproduce in a new project under Unity 2019.2 and HDRP 6.9. Just create a particle system, make it use Lights, and even just preview the particle system in the Editor.

Reported at bug #1176055.

 

If have the same "XRSystem.ReleaseFrame() was not called!" error...
But with me, nothing is rendered anymore... (HDRP 6.9.1, Unity 2019.2.3f1)

 

Yup. The result is that if there is any particle in your scene with a light currently on it, all rendering will stop until the particles die. In short, you can't use Lights on particles right now in HDRP. Someone in support/QA told me this would be fixed in a future HDRP release.

 

I don't have any particles in my entire project...

 

Ah. No idea, then. Does this happen in a brand new scene? I'd probably start removing things one-by-one from your scene until you find the thing that's causing this to occur. But it sounds like you've found a different bug that happens to have a similar error message and behavior.

 

For me, this is the exact problem I have
https://forum.unity.com/threads/emp...2019-2b10-with-hdrp-with-possible-fix.718808/

 

Thanks for the context. As for the original issue I reported as #1176055, where Lights don't work with particles under HDRP in 2019.2 or 2019.3, any idea when that might be corrected? It's preventing me from moving up to 2019.2. Thanks.

 

It looks like a fix for this issue has been included in the HDRP 8.0 release notes:

And according to the issue tracker, the fix is in review for 7.1.2. Does that mean that this is only getting fixed in 2019.3, and not getting backported to 2019.2 as well?

 

Looks like this was just fixed in 7.1.2, as a pretty simple one-line fix:

https://github.com/Unity-Technologies/ScriptableRenderPipeline/pull/4649/files

Hopefully this can be considered for back-merging to 6.x/2019.2 in the near future? I can manually fix this in the package, but the package just gets reset each time I reopen Unity. Is there a way to prevent the package manager from updating a manually modified package?

 

Move it to Packages folder from Library (where manifest.json)

 

The issue is back on 7.1.5 but now nothing renders anymore if there's a particle system with a light on.

 

Same here.

 

2019.3.0f1 and HDRP 7.1.6

No more errors and rendering of the scene doesn't stop anymore, but the lights don't actually light anything.

 

This issue is back on 2021.1.5f HDRP11

 

Issue remains

 

Still having to turn off lights because scene isn't rendering...