/usr/lib/ is in ruby-celluloid-supervision 0.20.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/celluloid/
/usr/lib/ruby/vendor_ruby/celluloid/supervision/
/usr/lib/ruby/vendor_ruby/celluloid/supervision/supervise.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/validation.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/service.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/deprecate/
/usr/lib/ruby/vendor_ruby/celluloid/supervision/deprecate/supervise.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/deprecate/validation.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/deprecate.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/configuration.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/constants.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/configuration/
/usr/lib/ruby/vendor_ruby/celluloid/supervision/configuration/instance.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/configuration/injections.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/behavior/
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/behavior/tree.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/behavior.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/instance.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/injections.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/container/tree.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision/version.rb
/usr/lib/ruby/vendor_ruby/celluloid/supervision.rb