Steps to Reproduce

Launch Development Editor with -game -opengl and enable RHI thread.

When drawing shadows, the pixel shader may be null and will try to use FNullPS, and it will cause thread conflict. The call stack is under below.

 

 

 

 

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-73121 in the post.

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Won't Fix
ComponentUE - Graphics Features
Affects Versions4.21.2
Target Fix4.24
CreatedApr 22, 2019
ResolvedSep 3, 2019
UpdatedNov 27, 2019