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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (QPID-4144) HA broker deadlocks on broeker::QueueRegistry lock and ha::Primary lock
Date Tue, 17 Jul 2012 17:35:34 GMT

     [ https://issues.apache.org/jira/browse/QPID-4144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Conway updated QPID-4144:
------------------------------

    Attachment: thread-dump.txt

Thread dump of the deadlocked process.
                
> HA broker deadlocks on broeker::QueueRegistry lock and ha::Primary lock
> -----------------------------------------------------------------------
>
>                 Key: QPID-4144
>                 URL: https://issues.apache.org/jira/browse/QPID-4144
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Clustering
>    Affects Versions: 0.17
>            Reporter: Alan Conway
>            Assignee: Alan Conway
>             Fix For: 0.18
>
>         Attachments: thread-dump.txt
>
>
> Running tests repeatedly, the broker deadlocked with the attached stack trace.
> The problem call sequences are:
> 1. QueueRegistry::destroy takes QueuerRegistry lock > ConfigurationObserver::queueDestroy
> ha::Primary::queueDestroy takes Primary lock.
> 2. ConnectionObserver::opened cals Primary::opened lock> RemoteBackup>getQueues().eachQueue
> This patch breaks the deadlock at both ends: QueueRegistry no longer holds the lock across
the observer call and Primary does not hold the lock across eachQueue.

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