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Posted to dev@qpid.apache.org by "Ken Giusti (JIRA)" <qp...@incubator.apache.org> on 2010/04/15 19:11:48 UTC
[jira] Assigned: (QPID-2507) C++ broker can deadlock when
processing a bind.
[ https://issues.apache.org/jira/browse/QPID-2507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ken Giusti reassigned QPID-2507:
--------------------------------
Assignee: Ken Giusti
> C++ broker can deadlock when processing a bind.
> -----------------------------------------------
>
> Key: QPID-2507
> URL: https://issues.apache.org/jira/browse/QPID-2507
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Environment: c++ broker on linux.
> Reporter: Ken Giusti
> Assignee: Ken Giusti
>
> Rarely happens, but I was lucky enough to catch this on the debugger.
> Broker locks due to lock inversion. Here's the flow:
> thread 1 (broker):
> 1) gets bind request for the management topic exchange
> 2) binds to the management topic exchange [takes topic->lock]
> 3) attempts to call management agent allocId() [takes mgmt agent->userLock]
> At the same time:
> thread 4 (mgmt agent periodic timer)
> 1) periodic processing [takes mgmt agent->userLock]
> 2) call topicexchange::route() [takes topic->lock]
> thread one holds the topic->lock, tries to take mgmt agent->userLock
> thread four holds mgmt agent->userLock, tries to take topic->lock
> deadlock.
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