NPE around NettyPortUnificationServerHandler.decode

pbmh92 commented 1 year ago

[ ] I have searched the issues of this repository and believe that this is not a duplicate.

Environment

Dubbo version: 3.1.10
Operating System version: xxx
Java version: 1.8

Steps to reproduce this issue

偶发，有个服务报这个错误，调用方超时

Pls. provide [GitHub address] to reproduce this issue.

Expected Behavior

Actual Behavior

If there is an exception, please attach the exception trace:

类名 org.apache.dubbo.remoting.transport.netty4.NettyPortUnificationServerHandler 方法名 NettyServerWorker-7-2 线程名 NettyServerWorker-7-2 内容
[DUBBO] Unexpected exception from downstream before protocol detected., dubbo version: 3.1.10, current host: 172.17.0.1, error code: 99-0. This may be caused by unknown error in remoting module, go to https://dubbo.apache.org/faq/99/0 to find instructions. io.netty.handler.codec.DecoderException: java.lang.NullPointerException 　　at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:471) 　　at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) 　　at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) 　　at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) 　　at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) 　　at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) 　　at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) 　　at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) 　　at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) 　　at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) 　　at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) 　　at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) 　　at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) 　　at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) 　　at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) 　　at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) 　　at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) 　　at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException 　　at org.apache.dubbo.remoting.transport.netty4.NettyPortUnificationServerHandler.decode(NettyPortUnificationServerHandler.java:100) 　　at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501) 　　at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:440) 　　... 17 more