/usr/share/man/man3/read_deallocate.3.gz is in libstaden-read-dev 1.13.5-1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/read_allocate.3.gz
/usr/share/man/man3/read_allocate.3.gz