/usr/lib/ruby/vendor_ruby/ is in reel 0.6.1-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/reel/
/usr/lib/ruby/vendor_ruby/reel/connection.rb
/usr/lib/ruby/vendor_ruby/reel/logger.rb
/usr/lib/ruby/vendor_ruby/reel/mixins.rb
/usr/lib/ruby/vendor_ruby/reel/request/
/usr/lib/ruby/vendor_ruby/reel/request/body.rb
/usr/lib/ruby/vendor_ruby/reel/request/info.rb
/usr/lib/ruby/vendor_ruby/reel/request/parser.rb
/usr/lib/ruby/vendor_ruby/reel/request/state_machine.rb
/usr/lib/ruby/vendor_ruby/reel/request.rb
/usr/lib/ruby/vendor_ruby/reel/response/
/usr/lib/ruby/vendor_ruby/reel/response/writer.rb
/usr/lib/ruby/vendor_ruby/reel/response.rb
/usr/lib/ruby/vendor_ruby/reel/server/
/usr/lib/ruby/vendor_ruby/reel/server/http.rb
/usr/lib/ruby/vendor_ruby/reel/server/https.rb
/usr/lib/ruby/vendor_ruby/reel/server.rb
/usr/lib/ruby/vendor_ruby/reel/spy.rb
/usr/lib/ruby/vendor_ruby/reel/stream.rb
/usr/lib/ruby/vendor_ruby/reel/version.rb
/usr/lib/ruby/vendor_ruby/reel/websocket.rb
/usr/lib/ruby/vendor_ruby/reel.rb