Memory leak during controller run

I freshly checked out the code for controller and changed to stable/hydrogen branch. after the successful build, when i start the controller, it reports the following issue.

"2016-01-07 16:30:29.813 IST [nettyThreadgroupModule$NioEventLoopGroupCloseable-6-1] ERROR io.netty.util.ResourceLeakDetector - LEAK: ByteBuf.release() was not called before it's garbage-collected. Enable advanced leak reporting to find out where the leak occurred. To enable advanced leak reporting, specify the JVM option '-Dio.netty.leakDetectionLevel=advanced' or call ResourceLeakDetector.setLevel()
"

Please have a look at this. I am new to this project so there is a possibility that i raised this bug with limited information.

-Ankit Kumar