Can't use PooledByteBufAllocator with SCTP

[perrinz]

Since 4.0.7.Final I've not been able to use PooledByteBufAllocator with the SCTP transport. The problem appears to have been introduced by 48a7a21 for issue #1697.

I checked to see if the same problem happens with the SCTP example, and it does -- if .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT) is added to the Bootstrap in NioSctpEchoClient, then simply running the server and client results in the following:

INFO: [id: 0x19eb15bb, /192.168.0.120:39359 => /192.168.0.120:2556] FLUSH
Oct 14, 2013 4:52:19 PM io.netty.handler.logging.LoggingHandler exceptionCaught
INFO: [id: 0x19eb15bb, /192.168.0.120:39359 => /192.168.0.120:2556] EXCEPTION: java.lang.IndexOutOfBoundsException: writerIndex: 14526720 (expected: readerIndex(0) <= writerIndex <= capacity(1024))
java.lang.IndexOutOfBoundsException: writerIndex: 14526720 (expected: readerIndex(0) <= writerIndex <= capacity(1024))
    at io.netty.buffer.AbstractByteBuf.writerIndex(AbstractByteBuf.java:87)
    at io.netty.channel.sctp.nio.NioSctpChannel.doReadMessages(NioSctpChannel.java:281)
    at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:71)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:478)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:801)
    at java.lang.Thread.run(Thread.java:724)

The same thing happens if .childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT) is added the server bootstrap in NioSctpEchoServer.