Graphics card: ATI Radeon HD 5670 512 MB (not supported and not used by Blender)
Blender Version 2.90.0 (2.90.0 2020-08-31)
Blender crashes when I try to render with cycles (CPU)
Exact steps for others to reproduce the error
Open Blender (only the default cube is there), in render properties select Cycles, then menu -> render image. Blender immediatly disappears.
In my opinion the problem is related to the introduction of Intel Embree.
Render with Eevee works fine.