Play mode completely locks up my computer

Questions & Answers
1

Completely losing my mind over this one…

Clicking Play-button often completely locks up my computer, I can’t even move the mouse cursor. I have to do a hard reset of my system.

Ran a CPU overnight stress test, a GPU test, and several memory tests. The computer passes these tests no problem.

I also tried playing some games on max settings, no issues at all. This is clearly only happening when Unity is running.

90% of the crashes happen when I hit the play button… 10% of the time the same freeze happens randomly. (usually freezes while importing HoloLens.DLL, but maybe this is just coincidence?).

For the project, we are all using Unity 2017.4.7f1 + Vuforia, but I have tried other versions including Unity v2018 and the crash still happens! I have also reinstalled Windows, and all that stuff.

Please help me, I have no idea what to do! Is it possible that a old webcam or older LCD monitor could cause this problem, those are the only two things left to check.

Computer is:
AMD Threadripper 1950x,
32 GB GSkill GDDR4 RAM,
Gigabyte 399x designare EX,
Asus GTX 1080 Turbo,
Windows 10 with latest updates.

3

If it worked on the empty project you probably have a loop inside of an update function in one of your scripts.

4

Fixed the problem. Apparently programs such as Unity have been coded to utilize a fused-multiply-add CPU instruction set, otherwise known as the FMA instruction set. AMD has a known bug with FMA and the company has released a press statement to look for motherboard updates to fix the issue. Last night I flashed to the latest BIOs for my motherboard; now the system is 100% stable when using Unity!

5

For anyone seeing this question and it might help you: this happened to me too, and finally I realized I had an infinite loop in one of my Awake functions. Sounds pretty obvious/stupid, but it’s worth checking out.