[jira] [Updated] (ZOOKEEPER-1750) Race condition producing NPE in NIOServerCnxn.toString

["Rakesh R (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-1750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rakesh R updated ZOOKEEPER-1750:
--------------------------------

    Attachment: 0001-ZOOKEEPER-1750-trunk-version.patch
    
> Race condition producing NPE in NIOServerCnxn.toString
> ------------------------------------------------------
>
>                 Key: ZOOKEEPER-1750
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1750
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.0
>            Reporter: Helen Hastings
>            Assignee: Rakesh R
>            Priority: Minor
>             Fix For: 3.5.0
>
>         Attachments: 0001-ZOOKEEPER-1750-trunk-version.patch
>
>
> The socket is closed and the variable "sock" is set to null for normal reasons, but the toString method is called before "sock" can be set again, producing a NullPointerException.
> Stack trace: 
> 2013-08-29 01:49:19,991 6277 [CommitProcWorkThread-3] WARN org.apache.zookeeper.server.WorkerService  - Unexpected exception
> java.lang.NullPointerException
>     at org.apach.zookeeper.server.NIOServerCnxn.toString(NIOServerCnxn.java:961)
>     at java.lang.String.valueOf(String.java:2854)
>     at java.lang.StringBuilder.append(StringBuilder.java:128)
>     at org.apache.zookeeper.server.NIOServerCnxn.process(NIOServerCnxn.java:1104)
>     at org.apache.zookeeper.server.WatchManager.triggerWatch(WatchManager.java:120)
>     at org.apache.zookeeper.server.WatchManager.triggerWatch(WatchManager.java:92)
>     at org.apache.zookeeper.server.DataTree.createNode(DataTree.java:544)
>     at org.apache.zookeeper.server.DataTree.processTxn(DataTree.java:805)
>     at org.apache.zookeeper.server.ZKDatabase.processTxn(ZKDatabase.java:319)
>     at org.apache.zookeeper.server.ZooKeeperServer.processTxn(ZooKeeperServer.java:967)
>     at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:115)
>     at org.apache.zookeeper.server.quorum.Leader$ToBeAppliedRequestProcessor.processRequest(Leader.java:859)
>     at org.apache.zookeeper.server.quorum.CommitProcessor$CommitWorkRequest.doWork(CommitProcessor.java:271)
>     at org.apache.zookeeper.server.WorkerService$ScheduledWorkRequest.run(WorkerService.java:152)
>     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>     at java.lang.Thread.run(Thread.java:722)

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