在k8s环境里，telnet 连接出错 java.lang.UnsupportedOperationException: Handle this case gracefully

[hengyunabc]

attach是成功了的，telent也可以连接上。但当在shell里输入字符时，连接就会断开，日志里的错误：

Arthas server agent start...
Arthas server already bind.
01 2020-02-20 15:44:15.930 INFO [nioEventLoopGroup-2-1:i.n.h.l.LoggingHandler] [id: 0x1ed033da, L:/0.0.0.0:3658] READ: [id: 0xe4666e8b, L:/127.0.0.1:3658 - R:/127.0.0.1:33915]
01 2020-02-20 15:44:15.931 INFO [nioEventLoopGroup-2-1:i.n.h.l.LoggingHandler] [id: 0x1ed033da, L:/0.0.0.0:3658] READ COMPLETE
01 2020-02-20 15:44:16.937 INFO [nioEventLoopGroup-2-5:arthas] [] [] [] Loaded arthas keymap file from com/taobao/arthas/core/shell/term/readline/inputrc
01 2020-02-20 15:44:29.251 ERROR [nioEventLoopGroup-2-5:i.t.c.io_error] Reported io error => closing
java.lang.UnsupportedOperationException: Handle this case gracefully
  at io.termd.core.util.Helper.computePosition(Helper.java:230)
  at io.termd.core.readline.LineBuffer.getPosition(LineBuffer.java:286)
  at io.termd.core.readline.LineBuffer.getCursorPosition(LineBuffer.java:272)
  at io.termd.core.readline.LineBuffer$Update.<init>(LineBuffer.java:325)
  at io.termd.core.readline.LineBuffer.update(LineBuffer.java:306)
  at io.termd.core.readline.Readline$Interaction.refresh(Readline.java:403)
  at io.termd.core.readline.Readline$Interaction.refresh(Readline.java:389)
  at io.termd.core.readline.Readline$Interaction.handle(Readline.java:288)
  at io.termd.core.readline.Readline$Interaction.access$200(Readline.java:189)
  at io.termd.core.readline.Readline.deliver(Readline.java:123)
  at io.termd.core.readline.Readline.access$500(Readline.java:41)
  at io.termd.core.readline.Readline$Interaction$2.accept(Readline.java:437)
  at io.termd.core.readline.Readline$Interaction$2.accept(Readline.java:431)
  at io.termd.core.tty.TtyEventDecoder.accept(TtyEventDecoder.java:93)
  at io.termd.core.tty.TtyEventDecoder.accept(TtyEventDecoder.java:26)
  at io.termd.core.tty.ReadBuffer.accept(ReadBuffer.java:44)
  at io.termd.core.tty.ReadBuffer.accept(ReadBuffer.java:28)
  at io.termd.core.io.BinaryDecoder.write(BinaryDecoder.java:117)
  at io.termd.core.io.BinaryDecoder.write(BinaryDecoder.java:65)
  at io.termd.core.telnet.TelnetTtyConnection.onData(TelnetTtyConnection.java:139)
  at io.termd.core.telnet.TelnetConnection.flushData(TelnetConnection.java:267)
  at io.termd.core.telnet.TelnetConnection.flushDataIfNecessary(TelnetConnection.java:257)
  at io.termd.core.telnet.TelnetConnection.receive(TelnetConnection.java:108)
  at io.termd.core.telnet.netty.TelnetChannelHandler.channelRead(TelnetChannelHandler.java:47)
  at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
  at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
  at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
  at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1421)
  at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
  at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
  at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)
  at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
  at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:697)
  at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:632)
  at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:549)
  at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:511)
  at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:918)
  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)

[hengyunabc]

应该和这个问题一致： #26