remove double thread.new

temp_file/playground_controller.rb

@@ -140,9 +140,7 @@ class Admin::PlaygroundController < OrbitAdminController
   				end
   				mul.status['alive'] = false
   		    mul.save
-  		    Thread.new do
-						Bundler.with_clean_env{system("kill -s USR2 `cat tmp/pids/unicorn.pid`")}
-					end
+  		    Bundler.with_clean_env{system("kill -s USR2 `cat tmp/pids/unicorn.pid`")}
   			end
   		rescue => e
   			mul.status['alive'] = false