guyinyou commented on issue #6518:
URL: https://github.com/apache/rocketmq/issues/6518#issuecomment-1491500452
It can be easily reproduced by the following demo
```
ByteBuffer buffer = ByteBuffer.allocateDirect(1000000);
buffer.position(1000000);
buffer.flip();
new Thread(()->{
while (buffer.hasRemaining()){
int pos = buffer.position();
buffer.mark();
buffer.get();
buffer.reset();
buffer.position(pos + 4);
}
System.out.println("over");
System.exit(0);
}).start();
new Thread(()->{
while (true){
ByteBuffer tmp = buffer.duplicate();
if(tmp.position() == 0){
System.out.println(tmp);
}
}
}).start();
}
```
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