/usr/lib/ruby/vendor_ruby/ is in ruby-packet 0.1.15-5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/packet/
/usr/lib/ruby/vendor_ruby/packet/packet_nbio.rb
/usr/lib/ruby/vendor_ruby/packet/packet_helper.rb
/usr/lib/ruby/vendor_ruby/packet/timer_store.rb
/usr/lib/ruby/vendor_ruby/packet/packet_invalid_worker.rb
/usr/lib/ruby/vendor_ruby/packet/disconnect_error.rb
/usr/lib/ruby/vendor_ruby/packet/packet_parser.rb
/usr/lib/ruby/vendor_ruby/packet/packet_guid.rb
/usr/lib/ruby/vendor_ruby/packet/packet_periodic_event.rb
/usr/lib/ruby/vendor_ruby/packet/packet_pimp.rb
/usr/lib/ruby/vendor_ruby/packet/packet_worker.rb
/usr/lib/ruby/vendor_ruby/packet/packet_master.rb
/usr/lib/ruby/vendor_ruby/packet/packet_connection.rb
/usr/lib/ruby/vendor_ruby/packet/packet_core.rb
/usr/lib/ruby/vendor_ruby/packet/packet_mongrel.rb
/usr/lib/ruby/vendor_ruby/packet/double_keyed_hash.rb
/usr/lib/ruby/vendor_ruby/packet/packet_event.rb
/usr/lib/ruby/vendor_ruby/packet/packet_callback.rb
/usr/lib/ruby/vendor_ruby/packet/packet_meta_pimp.rb
/usr/lib/ruby/vendor_ruby/packet_mongrel.rb
/usr/lib/ruby/vendor_ruby/packet.rb
/usr/lib/ruby/vendor_ruby/packet.rbc