Camera.Render causes a memory leak in HDRP using DirectX 12

Steps to reproduce:

• Open SampleScene in attached project
• Enter play mode
• Click on APIimageCreation / RenderTest

Result: GPU memory increate (look at windows task manager) until unity crashes

Expected: Not so much memory increase, and no crash.

 

Notes:

Seems to only occur using the DX12 API. If the project is switched to DX11, GPU memory usage is stable and the editor doesn't crash. Could not reproduce on a project using the Built-In render pipeline.

Reproduces with:

• Unity 2020.3.27f1
• Unity 2021.2.9f1

 

This was created for backporting the fogbuz ticket: https://fogbugz.unity3d.com/f/cases/1400617/