Mpirun failure for fenics 2019.1.0 installed from conda forge

I installed Fenics 2019.1.0 using miniconda as follows:

conda create -n fenics2019scipy -c conda-forge  python=3.7 scipy=1.5.1 fenics numpy=1.16.4

Following which, I am able to run scripts e.g. demo_cahn-hilliard.py perfectly fine. However, when I do an mpirun e.g.

mpirun -np 2 python demo_cahn-hilliard.py

The code hangs and my CPU usage goes to 100% on all threads. An mpirun using a container e.g. singularity seems to work fine but anaconda seems to make some noise.

Any help on this would be greatly appreciated!