I'm seeing this error as well after updating my drivers. I have a Windows 10 system with 4x Tesla K80, and things run fine in 2016b on driver set 356.54, however after updating to Matlab 2018 I've tried a number of driver versions (starting with the earliest to support Cuda 9.0) and continually get the following error when any of my simulations that do heavy computation start
Error using gpuArray/arrayfun An error occurred during PTX compilation of image.
The error log was:
The CUDA error code was: CUDA_ERROR_UNKNOWN
This error occurs in Matlab 2015, 2016, 2017, and 2018 when using (seemingly) any driver set compatible with them. It does not happen when doing fairly simple GPU array manipulation/multiplication though. I have't tried all of the driver versions, but i've tried several, inlcuding the oldest and newest compatible. I've tried downgrading to 356.54 and running it in 2016b again, and the problem goes away.