Rails - May 2014 - rails session hangs on hitting debugger line of code

Hi - Am using ruby-debug gem. When i run my rails application, once the 
control reaches the 'debugger' line, the entire session hangs. I cannot 
type or execute any commands further. Can i get some help here?

My code:
~~~~~~~~
require 'ruby-debug'

module Rearview
  class MonitorController < Rearview::ApplicationController

    before_action only: [:create] do
      clean_empty_array_vals(:metrics)
    end

    #
    # TODO this should be moved to the JobsController#test and the UI 
changed to push the
    # monitor job model instead of custom params
    #
    def create
      @errors = if params[:metrics].empty?
      Rails.logger.debug("ANANTH1:: errors obj:: #{@errors.inspect}")
                  [ "No metrics were provided" ]
                else
                  metrics_validator = 
Rearview::MetricsValidator.new({attributes: [:metrics]})
                  params[:metrics].inject([]) { |a,v| a << "Metrics 
contains an invalid metric: #{v}" 
unless(metrics_validator.metric_valid?(v)); a }
                end
*debugger*
      results = if @errors.empty?
      Rails.logger.debug("ANANTH2:: results obj::
#{@results.inspect}")
      Rails.logger.debug("ANANTH3:: #{:metrics}")
                  
Rearview::MonitorRunner.run(params[:metrics],params[:monitorExpr],params[:minutes],{},false,params[:toDate],true)
                else
                  { }
                end
      @monitor_output = Rearview::MonitorRunner.normalize_results(results)
      Rails.logger.debug("ANANTH4:: monitor_output obj:: 
#{@monitor_output.inspect}")
    end

  end
end
~~~~~~~~~~~~~~~

*Session hangs here.....*
*---------------------------------------*
/usr/local/rvm/gems/jruby-1.7.12/gems/ruby-debug-base-0.10.4-java/lib/ruby-debug-base.rb:214
warning: tracing (e.g. set_trace_func) will not capture all events without 
--debug flag
/usr/local/rvm/gems/jruby-1.7.12/gems/rearview-1.2.1-java/app/controllers/rearview/monitor_controller.rb:23
results = if @errors.empty?
(rdb:1)
*---------------------------------------*

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