System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon RX Vega ATI Technologies Inc. 4.5.14736 Core Profile Context 20.9.2 27.20.12031.1000

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8
Worked:

Short description of error
When apply a shadow catcher to a mesh and having denoiser on wether NLM or Opensource my blender either crashes and slows my computer enitrely or it creates incomplete renders in the final renders

Exact steps for others to reproduce the error
Apply a shadow catcher to a mesh
Enable Render denoiser
Render the scene