Sidekiq threads leaking

main.rb

require 'sidekiq/cli'
require 'sidekiq/api'

require 'celluloid'

puts Sidekiq::Stats.new.queues
Sidekiq::Queue.new('default').clear
Sidekiq::RetrySet.new.clear

module Count
  @count = 0
  def self.increment
    @count += 1
    if @count % 1000 == 0
      mem = (`ps -o rss -p #{$$}`.strip.split.last.to_i / 1024).to_i
      print "\b"*200 + "#{@count}: #{mem}MB"
    end
    if @count == 10000
      GC.start full_mark: true, immediate_sweep: true
      threads = ObjectSpace.each_object(Thread)
      fibers = ObjectSpace.each_object(Fiber)
      mem = (`ps -o rss -p #{$$}`.strip.split.last.to_i / 1024).to_i
      puts "\n#{@count}: #{mem}MB (Fibers: #{fibers.select(&:alive?).count}/#{fibers.count}, Threads: #{threads.select(&:alive?).count}/#{threads.count})\n"

      Process.kill 'INT', 0
    end
  end
end

class Brazay
  include Sidekiq::Worker
  sidekiq_options retry: false

  def perform
    Count.increment
    raise StandardError
  end
end

10000.times { Brazay.perform_async }

Sidekiq.logger = nil
Sidekiq::CLI.instance.tap do |cli|
  %w(validate! boot_system).each {|stub| cli.define_singleton_method(stub) {}}
  cli.parse ['-qdefault', '-c 10']
  cli.run
end