[jboss-jira] [JBoss JIRA] (JGRP-2040) Seeing a OOM in JGroup 3.4

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-2040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187699#comment-13187699 ] 

Bela Ban commented on JGRP-2040:
--------------------------------

Apparently, the receiver is reading an int which should be the length of the following buffer, but the data it is reading doesn't have an int. Is some other process sending data to the JGroups process? This could lead to TCP interpreting random data as an int (which is way to large).

> Seeing a OOM in JGroup 3.4
> --------------------------
>
>                 Key: JGRP-2040
>                 URL: https://issues.jboss.org/browse/JGRP-2040
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.4
>         Environment: Linux Operating System
>            Reporter: Kshitiz Saxena
>            Assignee: Bela Ban
>
> We are seeing an OOM in our application where thread dump points to JGroup.
> We see the below in thread dumps,
> 3XEHSTTYPE     07:33:24:346241000 GMT j9vm.294 -  >setCurrentException index=11 constructorIndex=0 detailMessage=0000000000F61678 
> 3XEHSTTYPE     07:33:24:346183000 GMT j9mm.126 -   at 0000000050F8CD60 java/lang/Thread.run()V, jit 00007FCF323EA580, pc 00007FCF489E0A36 
> 3XEHSTTYPE     07:33:24:346179000 GMT j9mm.126 -   at 0000000053644748 *org/jgroups/blocks/TCPConnectionMap$TCPConnection$Receiver.run()*V, jit 0000000000000000, pc 00007FCF3354D334 
> 3XEHSTTYPE     07:33:24:346175000 GMT j9mm.101 -   J9AllocateIndexableObject() returning NULL! *1650814064 bytes* requested for object of class 0000000050F79700 from memory space 'Generational' id=00007FCF440427C0 
> In the thread dump we also see 
> WARNING : OutOfMemoryError possibly caused by 1650814064 bytes requested for object of class 0000000050F79700 from memory space 'Generational' id=00007FCF440427C0 
> Java Heap Information
> -Xmx (Maximum Java heap size) : 1280m
> -Xms (Initial Java heap size) : 640m
> -Xss (Maximum stack size for Java threads) : 256k 
> Total Java heap size: 1.25 GB
> Used Java heap size: 174.27 MB
> Free Java heap size: 1.08 GB



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