OOM due to suspected memory leak in akka.dispatch.Dispatcher found by MAT in hprof

OOM error seen about 4 hours after ODL bring up:

2016-12-14 12:34:35,306 | WARN | entLoopGroup-6-1 | NioServerSocketChannel | 136 - io.netty.common - 4.0.37.Final | Failed to create a new channel from an accepted socket.
java.lang.OutOfMemoryError: Java heap space

2016-12-14 12:34:27,756 | ERROR | ntLoopGroup-7-28 | ExceptionHandler | 285 - org.opendaylight.ovsdb.library - 1.3.2.Boron-SR2 | Exception occurred while processing connection pipeline
io.netty.handler.codec.DecoderException: java.lang.OutOfMemoryError: Java heap space

karaf logs attached