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https://issues.apache.org/jira/browse/DIRMINA-651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680413#action_12680413
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Julien Vermillard commented on DIRMINA-651:
-------------------------------------------
it's race on statistics, really important ? because if we lock all those vars,
I suspect it'll have an impact on the perfs.
> Data Race in org.apache.mina.core.session.AbstractIoSession
> -----------------------------------------------------------
>
> Key: DIRMINA-651
> URL: https://issues.apache.org/jira/browse/DIRMINA-651
> Project: MINA
> Issue Type: Bug
> Components: Core
> Environment: [dan...@daniel-desk ~]$ uname -a
> Linux daniel-desk.dyndns.org 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:12 EDT
> 2008 i686 i686 i386 GNU/Linux
> [dan...@daniel-desk ~]$ java -version
> java version "1.6.0"
> Java(TM) SE Runtime Environment (build pxi3260sr2-20080818_01(SR2))
> IBM J9 VM (build 2.4, J2RE 1.6.0 IBM J9 2.4 Linux x86-32
> jvmxi3260-20080816_22093 (JIT enabled, AOT enabled)
> J9VM - 20080816_022093_lHdSMr
> JIT - r9_20080721_1330ifx2
> GC - 20080724_AA)
> JCL - 20080808_02
> Reporter: Daniel Luo
> Attachments: 20081217_ftpserver_multiusers.log
>
>
> We run ftpserver-1.0.0-M4 with our tool
> (http://www.alphaworks.ibm.com/tech/mtrat) and one user logins to the server,
> then a data race is reported. The data race happens in the field
> "readMessages" of class
> "org/apache/mina/transport/socket/nio/NioSocketSession". Thread
> "pool-3-thread-1" read this field while thread "pool-2-thread-1" write to it,
> which both threads don't share the same lock to protect the critical section.
> Data Race 4 : 1526 : org/apache/mina/transport/socket/nio/NioSocketSession :
> readMessages
> Thread "pool-3-thread-1" : Tid 15 : Rid 1540 : READ
> Lock Set : [ ]
> Vector Clock : 3
> [org/apache/mina/core/session/AbstractIoSession : updateThroughput :
> 667]
> [org/apache/mina/core/session/IdleStatusChecker : updateThroughput :
> 265]
> [org/apache/mina/core/session/IdleStatusChecker : notifyIdleSession :
> 201]
> [org/apache/mina/core/session/IdleStatusChecker : notifyIdleness : 150]
> [org/apache/mina/core/polling/AbstractPollingIoProcessor :
> notifyIdleSessions : 604]
> [org/apache/mina/core/polling/AbstractPollingIoProcessor : access$700 :
> 58]
> [org/apache/mina/core/polling/AbstractPollingIoProcessor$Worker : run :
> 863]
> [org/apache/mina/util/NamePreservingRunnable : run : 51]
> Thread "pool-2-thread-1" : Tid 16 : Rid 1683 : WRITE
> Lock Set : [ ]
> Vector Clock : 2
> [org/apache/mina/core/session/AbstractIoSession : increaseReadMessages
> : 728]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain$TailFilter :
> messageReceived : 746]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain :
> callNextMessageReceived : 414]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain : access$1200 :
> 49]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain$EntryImpl$1 :
> messageReceived : 832]
> [org/apache/ftpserver/listener/nio/FtpLoggingFilter : messageReceived :
> 83]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain :
> callNextMessageReceived : 414]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain : access$1200 :
> 49]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain$EntryImpl$1 :
> messageReceived : 832]
> [org/apache/mina/core/filterchain/IoFilterEvent : fire : 60]
> [org/apache/mina/filter/logging/MdcInjectionFilter : filter : 137]
> [org/apache/mina/filter/util/CommonEventFilter : messageReceived : 70]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain :
> callNextMessageReceived : 414]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain : access$1200 :
> 49]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain$EntryImpl$1 :
> messageReceived : 832]
>
> [org/apache/mina/filter/codec/ProtocolCodecFilter$ProtocolDecoderOutputImpl :
> flush : 379]
> [org/apache/mina/filter/codec/ProtocolCodecFilter : messageReceived :
> 173]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain :
> callNextMessageReceived : 414]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain : access$1200 :
> 49]
> [org/apache/mina/core/filterchain/DefaultIoFilterChain$EntryImpl$1 :
> messageReceived : 832]
> [org/apache/mina/core/filterchain/IoFilterEvent : fire : 60]
> [org/apache/mina/core/session/IoEvent : run : 64]
> [org/apache/mina/filter/executor/OrderedThreadPoolExecutor$Worker :
> runTask : 551]
> [org/apache/mina/filter/executor/OrderedThreadPoolExecutor$Worker :
> runTasks : 543]
> [org/apache/mina/filter/executor/OrderedThreadPoolExecutor$Worker : run
> : 487]
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