/usr/share/man/man3/umad_release_port.3.gz is in libibumad-dev 17.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/umad_get_port.3.gz
/usr/share/man/man3/umad_get_port.3.gz