Investigating a potential memory leak in the Rugged gem

rugged_leak.rb

require "rugged"

def diff_parents(commit)
  puts commit.oid
  commit.parents.each { |parent| parent.diff(commit) }
  commit.parents.each { |parent| diff_parents(parent) }
rescue SystemStackError
end

path = "#{__dir__}/rails"
if File.directory?(path)
  repo = Rugged::Repository.new(path)
else
  print "Cloning rails…"
  repo = Rugged::Repository.clone_at("https://github.com/rails/rails", path)
  puts " done"
end

diff_parents repo.head.target