/usr/share/man/man3/ibv_destroy_flow.3.gz is in libibverbs-dev 1.2.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/ibv_create_flow.3.gz
/usr/share/man/man3/ibv_create_flow.3.gz