/usr/lib/x86_64-linux-gnu/libtachyon-mpich-openmp.so is in libtachyon-mpich-0-dev 0.99~b6+dsx-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtachyon-mpich-openmp.so.0.0.0