AVX illegal instruction in job submitted from PyROOT

It seems to me that you are trying to use a ROOT binary distribution built for a “modern” architecture (e.g., Haswell with “modern” SSE / AVX support).
Expect problems if your computers do not support any of the “modern” features.
It’s not just about python, which will fail when importing ROOT. The standard ROOT binaries / libraries will break, too.
Any application that you link against ROOT libraries will die as soon as any “modern” SSE / AVX feature is used from inside of any ROOT library.
The only solution is to build ROOT so that its binaries will not require any “modern” SSE / AVX features.
Note: The standard binary distributions provided by the ROOT Team are fine (they are also available via the “cvmfs”). Maybe the “lcg/views” provides such binary distributions, too.