Steps to reproduce:
1. Open EyedropperTest project
2. Make sure Metal API is activated in Player settings
3. Select "Recolor me" sprite and open Color picker for changing its color
4. Select Eye drop tool and click around (unsure what causes small freeze when selecting or scrubbing through screen with it every once in a while)
5. Keep repeating step 4 until crash to Login

Expected result: Eyedropper quickly returns picked color from screen, doesn't freeze, definitely doesn't crash not only the program, but the whole OS
Actual result: After a couple of tries, the cursor will disappear and the program along with the user will crash to login screen

Reproduced on 5.6.0f3, 5.6.0p1
Doesn't reproduce on 2017.1.0b1, 5.5.2f1, 5.5.3p1

Note: Check repro video from youtube.
5.6.0f2, 5.6.0f1 selecting Eye drop tool straight up crashes Unity. 2017.1.0b1 doesn't crash everything, but I couldn't find any duplicates that mention an actual fix.