/usr/share/doc/infiniband-diags/changelog.Debian.gz is in infiniband-diags 1.6.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/infiniband-diags/../libibnetdisc5/changelog.Debian.gz
/usr/share/doc/infiniband-diags/../libibnetdisc5/changelog.Debian.gz