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From "Justin Ross (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (QPID-8056) qpid::messaging::ConnectionContext crash after network disconnect (with patch)
Date Mon, 11 Dec 2017 13:27:00 GMT

     [ https://issues.apache.org/jira/browse/QPID-8056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Justin Ross updated QPID-8056:
    Fix Version/s: qpid-cpp-1.38.0

> qpid::messaging::ConnectionContext crash after network disconnect (with patch)
> ------------------------------------------------------------------------------
>                 Key: QPID-8056
>                 URL: https://issues.apache.org/jira/browse/QPID-8056
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Client
>    Affects Versions: qpid-cpp-1.36.0
>         Environment: RedHat Enterprise Linux 6
>            Reporter: HÃ¥kan Johansson
>              Labels: crash
>             Fix For: qpid-cpp-1.38.0
>         Attachments: connection_context.diff, valgrind.txt
> When doing HA testing we found that our application often crashed inside the Qpid Messaging
> Our test:
> * One ActiveMQ broker.
> * Two proxies connecting to the AMQP port on the broker. At the start, only one of the
proxies are running.
> * Test program configured to use failover between the two proxies. Protocol is "amqp1.0".
It reads messages in a loop using a transactional session. On error it closes the connection
and opens a new.
> * Send some messages and let the test program process them.
> * Stop proxy1 and start proxy2.
> * Send some more messages and let the test program process them.
> * Stop proxy2 and start proxy1.
> * And so on...
> After a couple of switches the test program crashes, but not always. It's a timing thing.
> A typical error message that we see before the crash:
> {noformat}
> Exception when trying to close the qpid connection: Transaction outcome unknown: transport
> {noformat}
> The reason for the crash is that the poller thread is still active when the connection
is being deleted. The destructor of the {{qpid::messaging::ConnectionContext}} class deletes
the {{TcpTransport}} instance at the same time as, or right before, the poller thread is calling
a callback on it ({{qpid::messaging::amqp::TcpTransport::disconnected}}).
> I have attached a patch to solve the issue, at least for this use case.
> I cannot test this on {{1.37.0}} as I cannot build that version on RHEL6 as it uses Python
2.6 which is no longer supported in {{1.37.0}}. The code in question is identical in {{1.36.0}}
and {{1.37.0}} though.

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