FShadowSceneRenderer::AddDirectionalLightShadow crash

Development Rendering
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Hello folks

We have updated to 5.6.0 coming from 5.5.4.

We are experimenting a random crash because the DirectionalLights array is empty in FShadowSceneRenderer::AddDirectionalLightShadow.

We think that the crash is caused by a race condition when a CreateDynamicShadows task is executed right after removing the directional light from the shadow scene.

We haven’t found a deterministic way to reproduce the crash.

We are checking if the DirectionalLights array is empty as workaround and it seems to work but we would like to apply a proper fix.

Is there any advice you can give us to narrow the issue?

Thanks in advance for your time

Sergi

2

Hello,

This crash is likely the same crash we have a fix for in 5.6.1

CL#43147120 Fixed crash in ShadowSceneRenderer caused by a race with the task updating the ShadowScene.

I’ve flagged the issue so it should be visible publicly soon here Unreal Engine Issues and Bug Tracker (UE\-294069)

3

Thanks [mention removed]​ for the quick response.

I will integrate it asap.