stacktrace for rspec hangs

gistfile1.txt

# from https://github.com/rspec/rspec-rails/issues/1353
# put this in spec/initializers/debug_hangs.rb, then use 'kill -USR1 <rspec-pid>' when rspec hangs

puts "rspec pid: #{Process.pid}"

trap 'USR1' do
  threads = Thread.list

  puts
  puts '=' * 80
  puts "Received USR1 signal; printing all #{threads.count} thread backtraces."

  threads.each do |thr|
    description = thr == Thread.main ? 'Main thread' : thr.inspect
    puts
    puts "#{description} backtrace: "
    puts thr.backtrace.join("\n")
  end

  puts '=' * 80
end