symat commented on issue #1300: ZOOKEEPER-3769: handling malformed Leader Election notification messages URL: https://github.com/apache/zookeeper/pull/1300#issuecomment-605597388 I saw two kinds of exceptions, related to this problem. (if I remember correctly, the stack traces were gathered on 3.5.7) ``` 03/24/20 11:16:16,297 [WorkerReceiver[myid=1]] ERROR [org.apache.zookeeper.server.NIOServerCnxnFactory] (NIOServerCnxnFactory.java:92) - Thread Thread[WorkerReceiver[myid=1],5,main] died java.nio.BufferUnderflowException: null at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:178) ~[?:?] at java.nio.ByteBuffer.get(ByteBuffer.java:762) ~[?:?] at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerReceiver.run(FastLeaderElection.java:278) ~[zookeeper-3.5.7.jar:3.5.7] ``` And an other case (this can happen when wrong protocol format is expected due to the wrong message size): ``` 03/23/20 10:14:46,127 [WorkerReceiver[myid=1]] ERROR [org.apache.zookeeper.server.NIOServerCnxnFactory] (NIOServerCnxnFactory.java:92) - Thread Thread[WorkerReceiver[myid=1],5,main] died java.lang.NegativeArraySizeException: -1082130432 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerReceiver.run(FastLeaderElection.java:276) ~[zookeeper-3.5.7.jar:3.5.7] at java.lang.Thread.run(Thread.java:835) ~[?:?] ``` I was able to reproduce these errors with the unit tests I created. But unfortunately I am not able to reproduce the problem with real ZooKeeper. Lasaro Camargos (who reported the issue) said that the error happened both with NIO and Netty.
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