unknown error

here is a section of my log , it seems to only happen with 1 user

memory usage also goes up to 100%

latency causes everyone to get kicked

this is from logs\fml-server-latest.log

anyone have any idea what causes this, or what i should look for

[08:51:05] [server thread/DEBUG] [FML/]: Gathering id map for writing to world save LegoLand
[08:52:26] [Netty IO #2/ERROR] [FML/]: NetworkDispatcher exception
java.io.IOException: Broken pipe
at sun.nio.ch.FileDispatcher.write0(Native Method) ~[?:1.6.0_24]
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) ~[?:1.6.0_24]
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:122) ~[?:1.6.0_24]
at sun.nio.ch.IOUtil.write(IOUtil.java:93) ~[?:1.6.0_24]
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:352) ~[?:1.6.0_24]
at io.netty.buffer.UnpooledHeapByteBuf.getBytes(UnpooledHeapByteBuf.java:208) ~[unpooledHeapByteBuf.class:?]
at io.netty.buffer.UnpooledHeapByteBuf.readBytes(UnpooledHeapByteBuf.java:214) ~[unpooledHeapByteBuf.class:?]
at io.netty.channel.socket.nio.NioSocketChannel.doWriteBytes(NioSocketChannel.java:214) ~[NioSocketChannel.class:?]
at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:178) ~[AbstractNioByteChannel.class:?]
at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:231) ~[NioSocketChannel.class:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:680) ~[AbstractChannel$AbstractUnsafe.class:?]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:260) ~[AbstractNioChannel$AbstractNioUnsafe.class:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:649) ~[AbstractChannel$AbstractUnsafe.class:?]
at io.netty.channel.DefaultChannelPipeline$HeadHandler.flush(DefaultChannelPipeline.java:1038) ~[DefaultChannelPipeline$HeadHandler.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at cpw.mods.fml.common.network.handshake.NetworkDispatcher.flush(NetworkDispatcher.java:430) ~[NetworkDispatcher.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:700) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:893) ~[DefaultChannelPipeline.class:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:239) ~[AbstractChannel.class:?]
at net.minecraft.network.NetworkManager$1.run(NetworkManager.java:174) [ek.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [singleThreadEventExecutor.class:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348) [NioEventLoop.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [singleThreadEventExecutor$2.class:?]
at java.lang.Thread.run(Thread.java:679) [?:1.6.0_24]
[08:53:26] [Netty IO #4/ERROR] [FML/]: NetworkDispatcher exception
io.netty.handler.timeout.ReadTimeoutException
[08:53:32] [server thread/DEBUG] [FML/]: Gathering id map for writing to world save LegoLand

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