Router causes infinite recursion under certain rare conditions

Router worker thread could end up in an infinite stack trace and fill up the disk in some scenarios where the channel is not closed and when there are exceptions in channels.write call. The side effect of this will be one or more worker thread will be tied up in the infinite recursion and the disks will fill up. The following code fragment is responsible for the call.

The fix is to detect the recursed call and not calling Channels.write during recursion.