[jira] [Resolved] (QPID-4163) Deadlock between LinkRegistry and TimerTask locks

["Alan Conway (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/QPID-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Conway resolved QPID-4163.
-------------------------------

    Resolution: Fixed

Comitted to 0.18 branch r1365045
                
> Deadlock between LinkRegistry and TimerTask locks
> -------------------------------------------------
>
>                 Key: QPID-4163
>                 URL: https://issues.apache.org/jira/browse/QPID-4163
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>    Affects Versions: 0.17
>            Reporter: Alan Conway
>            Assignee: Alan Conway
>             Fix For: 0.18
>
>         Attachments: ha-timer-hang.pstack
>
>
> Very occasionally (about 2% of runs), when running ha_tests.py in a long loop one of the brokers deadlocks with the attached stack trace. The problem is a call to TimerTask::cancel with the LinkRegsitry lock held, while another thread is in TimerTask::fire and waiting for the LinkRegistry lock.

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