System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: Intel(R) HD Graphics 4600 Intel 4.3.0 - Build 10.18.14.5067

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 11:00, hash: rBd663048696b2
Worked: (optional)

Short description of error
CRASH when "Metallic" property in Cycles node is set to anything above 0.999~, i.e. maximum.

Exact steps for others to reproduce the error
CRASH when "Metallic" property in Cycles node and in Materials context tab area is set to 1.0. Maximum seems to be 0.999~. Reproduced this crash 4 times, each time with the exact same result.

UPDATE: If value is set to 0.9999, the value is automatically converted to 1.0 with no crash. If the value is then set lower and then higher again using mouse drag, there is no crash either. But when rebooting Blender 2.8 and trying to set value to maximum (1.0) using mouse, Blender CRASHES again.