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

             Summary: 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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