/usr/lib/x86_64-linux-gnu/libibverbs.so is in libibverbs-dev 1.2.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libibverbs.so.1.0.0
/usr/lib/x86_64-linux-gnu/libibverbs.so.1.0.0