/usr/ is in ruby-grit-ext 0.8.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/grit_ext/
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/grit_ext-0.8.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-grit-ext/
/usr/share/doc/ruby-grit-ext/copyright
/usr/share/doc/ruby-grit-ext/changelog.Debian.gz
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/grit_ext/diff.rb
/usr/lib/ruby/vendor_ruby/grit_ext/actor.rb
/usr/lib/ruby/vendor_ruby/grit_ext/blob.rb
/usr/lib/ruby/vendor_ruby/grit_ext/tree.rb
/usr/lib/ruby/vendor_ruby/grit_ext/tag.rb
/usr/lib/ruby/vendor_ruby/grit_ext/version.rb
/usr/lib/ruby/vendor_ruby/grit_ext/commit.rb
/usr/lib/ruby/vendor_ruby/grit_ext.rb