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From Håkan Johansson (Jira) <j...@apache.org>
Subject [jira] [Created] (QPID-8438) qpid_messaging (amqp1.0) randomly hangs when closing the connection.
Date Mon, 27 Apr 2020 13:19:00 GMT
Håkan Johansson created QPID-8438:
-------------------------------------

             Summary: qpid_messaging (amqp1.0) randomly hangs when closing the connection.
                 Key: QPID-8438
                 URL: https://issues.apache.org/jira/browse/QPID-8438
             Project: Qpid
          Issue Type: Bug
          Components: C++ Client
    Affects Versions: qpid-cpp-1.39.0
            Reporter: Håkan Johansson


This is basically QPID-8179 again.

We are using {{qpid_messaging}} to communicate with an ActiveMQ broker using the {{amqp1.0}}
protocol.

We have noticed during both large scale tests and in production that our program sometimes
hangs when it is closing the connection to the broker. This is a very rare occurrence, but
happens often enough to be annoying, especially when it happens in production.

While the design of the  {{amqp1.0}} implementation is generally nice, I have noticed a lack
of life cycle management for the helper objects, especially the ones interacting with background
threads. The background thread is shut down when closing the last remaining connection, but
not enough care is being taken to make sure it is in a safe state to do so.

If an event is being processed when the connection is closed, then a deadlock might occur,
as seen in this stack-trace:
{noformat}
Thread 1 (Thread 0x7fbaa5857880 (LWP 47152)):
#0  0x00007fbaa1428965 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fba7e872c72 in qpid::sys::Condition::wait(qpid::sys::Mutex&) () from /opt/jeppesen/jcms/lib/x86_64_linux/libqpidcommon.so.2
#2  0x00007fba7e878c0b in qpid::sys::TimerTask::cancel() () from /opt/jeppesen/jcms/lib/x86_64_linux/libqpidcommon.so.2
#3  0x00007fba7f2ad056 in qpid::messaging::amqp::ConnectionContext::close() () from /opt/jeppesen/jcms/lib/x86_64_linux/libqpidmessaging.so.2
{noformat}




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