Ruby on Rails

... lib/ruby/1.9.1/net/smtp.rb:583: [BUG] Segmentation fault

My config/environments/development.rb file has the following:

  config.action_mailer.delivery_method = :smtp
  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.default_url_options = { :host => 'localhost:3000' }

ActionMailer::Base.smtp_settings = {
  :address              => "smtp.gmail.com",
  :port                 => 587,
  :domain               => "mydomain.com",
  :user_name            => "[redacted]",
  :password             => "[redacted]",
  :authentication       => "plain",
  :enable_starttls_auto => true
}
ActionMailer::Base.default_url_options[:host] = "localhost:3000"

The relevant code in smtp.rb   are these two methods:

def ssl_socket(socket, context)
  OpenSSL::SSL::SSLSocket.new socket, context
end

def tlsconnect(s)
  verified = false
  s = ssl_socket(s, @ssl_context)
  logging "TLS connection started"
  s.sync_close = true
  s.connect  # THIS IS LINE 583
  if @ssl_context.verify_mode != OpenSSL::SSL::VERIFY_NONE
    s.post_connection_check(@address)
  end
  verified = true
  s
ensure
  s.close unless verified
end

I've tried setting :enable_starttls_auto to false.  I don't get a segmentation fault, but no mail goes out either.  I can get a session going with the gmail smtp host via the command line.  I'm running on the latest version of Mac OS.  

Never had to debug a segmentation fault before.  Pretty intimidating.  Any thoughts, ideas, approaches?