[jboss-jira] [JBoss JIRA] (JGRP-1443) Null pointer exception testing proposed fix for JGRP-1426

[David Hotham (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681178#comment-12681178 ] 

David Hotham commented on JGRP-1443:
------------------------------------

Still hitting problems, I'm afraid...

Just to remind you of my testcase:
-  I have a group with three ever-present members A, B, C
-  members D and E take it in turns to try and join the group, wait for the view to settle, and be killed
-  everyone broadcasts a message every few seconds

The NPE reported here was hit by one of the ever-presents.

When I came in this morning, I found that member E was using all of the CPU on one of my cores (and had failed to join the group).  Presumably some thread is tight-looping.

Sadly, jstack / jconsole etc (I'm on Windows) were unable to attach to the process so I haven't been able to get any more useful insight into where the problem is.

I suppose we have one of:
-  something about the fix you've made on the ever-presents causes the joiner to tight loop
-  a new problem

Can you please advise?
-  would you like to track this issue under a new ticket, or do you think it's likely to be all part of the same thing?
-  what trace would be useful?

Thanks!
                
> Null pointer exception testing proposed fix for JGRP-1426
> ---------------------------------------------------------
>
>                 Key: JGRP-1443
>                 URL: https://issues.jboss.org/browse/JGRP-1443
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.0.8
>            Reporter: David Hotham
>            Assignee: Bela Ban
>             Fix For: 3.0.9, 3.1
>
>         Attachments: jgroups-3.0.9.Final.jar
>
>
> Per email exchange: testing a proposed fix for JGRP-1426, I hit the following exception:
> SEVERE: failed sending message to 10.239.0.5 (185 bytes):
> java.lang.NullPointerException, cause: null
> java.lang.NullPointerException
>         at org.jgroups.protocols.pbcast.JoinRsp.writeTo(JoinRsp.java:90)
>         at org.jgroups.util.Util.writeStreamable(Util.java:934)
>         at org.jgroups.protocols.pbcast.GMS$GmsHeader.writeTo(GMS.java:1155)
>         at org.jgroups.Message.writeHeader(Message.java:891)
>         at org.jgroups.Message.writeTo(Message.java:698)
>         at org.jgroups.protocols.TP.writeMessage(TP.java:1367)
>         at org.jgroups.protocols.TP.send(TP.java:1279)
>         at org.jgroups.protocols.TP.down(TP.java:1138)
>         at org.jgroups.protocols.Discovery.down(Discovery.java:573)
>         at org.jgroups.protocols.TCPPING.down(TCPPING.java:108)
>         at org.jgroups.protocols.MERGE3.down(MERGE3.java:242)
>         at org.jgroups.protocols.FD.down(FD.java:308)
>         at org.jgroups.protocols.VERIFY_SUSPECT.down(VERIFY_SUSPECT.java:80)
>         at org.jgroups.protocols.pbcast.NAKACK2.down(NAKACK2.java:493)
>         at org.jgroups.protocols.UNICAST2.down(UNICAST2.java:502)
>         at org.jgroups.protocols.pbcast.STABLE.down(STABLE.java:328)
>         at org.jgroups.protocols.pbcast.GMS.sendJoinResponse(GMS.java:543)
>         at org.jgroups.protocols.pbcast.CoordGmsImpl.handleMembershipChange(CoordGmsImpl.java:156)
>         at org.jgroups.protocols.pbcast.GMS$ViewHandler.process(GMS.java:1390)
>         at org.jgroups.protocols.pbcast.GMS$ViewHandler.run(GMS.java:1344)
>         at java.lang.Thread.run(Thread.java:662)
> You said: 
> {quote}
> ah, ok, this is a change I made recently, to reduce the size of digests.
> Can you open a JIRA so we can track this ?
> I'll fix it this week.
> {quote}
> ... so here we are.
> Thanks!
> David

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