[jboss-jira] [JBoss JIRA] Resolved: (JGRP-896) GMS: ConcurrentModificationException in AckCollector.handleView()

[Bela Ban (JIRA)]

     [ https://jira.jboss.org/jira/browse/JGRP-896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-896.
---------------------------

    Resolution: Done


fixed CCME caused by unprotected access to suspected_mbrs; access is now wrapped by stnchronized clause

> GMS: ConcurrentModificationException in AckCollector.handleView()
> -----------------------------------------------------------------
>
>                 Key: JGRP-896
>                 URL: https://jira.jboss.org/jira/browse/JGRP-896
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.6.5
>            Reporter: Philippe Julien
>            Assignee: Bela Ban
>             Fix For: 2.6.8, 2.8
>
>
> We encountered the following CME exception on one of our production environment:
> java.util.ConcurrentModificationException
> 	at java.util.HashMap$HashIterator.remove(HashMap.java:860)
> 	at java.util.AbstractCollection.retainAll(AbstractCollection.java:393)
> 	at org.jgroups.util.AckCollector.handleView(AckCollector.java:85)
> 	at org.jgroups.protocols.pbcast.GMS.installView(GMS.java:479)
> 	at org.jgroups.protocols.pbcast.CoordGmsImpl.handleViewChange(CoordGmsImpl.java:460)
> 	at org.jgroups.protocols.pbcast.GMS.up(GMS.java:711)
> 	at org.jgroups.protocols.VIEW_SYNC.up(VIEW_SYNC.java:192)
> 	at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:233)
> 	at org.jgroups.protocols.UNICAST.up(UNICAST.java:299)
> 	at org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:861)
> 	at org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:693)
> 	at org.jgroups.protocols.BARRIER.up(BARRIER.java:136)
> 	at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:167)
> 	at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:203)
> 	at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:308)
> 	at org.jgroups.protocols.MERGE2.up(MERGE2.java:144)
> 	at org.jgroups.protocols.Discovery.up(Discovery.java:263)
> 	at org.jgroups.protocols.TP.passMessageUp(TP.java:1275)
> 	at org.jgroups.protocols.TP.access$100(TP.java:49)
> 	at org.jgroups.protocols.TP$1.run(TP.java:1178)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
> 	at java.lang.Thread.run(Thread.java:595)

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