TTA-s on mac with AMD GPU causes system lockup and forced logout

[KeygenLLC]

This software runs pretty fast normally thanks to supporting GPU on the mac compared to the original RIFE. It gets through a few hundred images in 1080p in less than a minute. I'm testing on an iMac Pro with a Pro Vega 64 card and mac OS Mojave. 3-year old machine but it crunches through images pretty quickly.

I was just testing enabling TTA mode with the -x flag, and it grinds the system to a halt and forces a user logout, which is bizarre. It processed about 10-13 frames and then everything just locks up and the login window appears after a minute or so.

The images I'm processing are 1080p 8-bit RGB PNG files.

I tried a second run using -j 2:2:2 and this forced a system lockup and force logout even quicker than not setting the flag.

Is this bugged on mac or is there a way to set this up so TTA can be used and not kill the system in the process?