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Viewport rendering with cycles, CPU device, and viewport denoising crashes blender.
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce MX150/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.38

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Worked: (newest version of Blender that worked as expected)

Short description of error
When rendering with cycles with CPU device selected, any kind of viewport denoising Auto/OptiX, etc. crashes blender.

Exact steps for others to reproduce the error
1.Create a new blender file with default cube.

  1. Select cycles as renderer, with default device as CPU selected.
  2. Enable viewport denoising, with any denoising option (Auto/OptiX, etc.) selected.
  3. Click on display render preview for viewport rendering. Blender starts to render, and crashes within seconds.
  • Sample blend file attached.

[Based on the default startup or an attached .blend file (as simple as possible)]