[jboss-jira] [JBoss JIRA] (JGRP-1659) deadlock in MFC with default configureation

[Mircea Markus (JIRA)]

Mircea Markus created JGRP-1659:
-----------------------------------

             Summary: deadlock in MFC with default configureation
                 Key: JGRP-1659
                 URL: https://issues.jboss.org/browse/JGRP-1659
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 3.2.7
            Reporter: Mircea Markus
            Assignee: Bela Ban


MFC.down does the following:

{code:java}
            credits.decrement(length, block_time); //A
            if(needToSendCreditRequest()) //B
                    sendCreditRequest(tuple.getVal1(), Math.min(max_credits)
{code}

A blocks forever even if the MFC.max_block_time is configured:
{code:xml}
<MFC max_credits="200k" min_threshold="0.20" max_block_time="1"/>
{code} 
This happens at the same time on the whole cluster. B never gets invoked, so both wake up conditions( credits received or timeout) for credits.decrement are never satisfied resulting in the whole cluster to freeze.



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