I've recently ran into a set of GPU-related crashes when trying Copernicus (File, Constant COPs) and OpenCL SOP nodes. It looks like, though not a solution, there's a workaround, which hopefully may be solved in the future if SideFX decides to support Intel GPUs:
Add the following 2 lines into your Houdini start script:
export HOUDINI_USE_HFS_OCL=1 export HOUDINI_OCL_DEVICETYPE=CPU
I hope that may help somebody in the future.
Cheers!