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From Håkan Johansson (JIRA) <j...@apache.org>
Subject [jira] [Commented] (QPID-8179) qpid_messaging (amqp1.0) randomly hangs when closing the connection.
Date Thu, 03 May 2018 08:57:00 GMT

    [ https://issues.apache.org/jira/browse/QPID-8179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16462136#comment-16462136

Håkan Johansson commented on QPID-8179:

I made a mistake with my setup when trying to reproduce the bug. 
I will run it again and come back to you (probably tomorrow).

> qpid_messaging (amqp1.0) randomly hangs when closing the connection.
> --------------------------------------------------------------------
>                 Key: QPID-8179
>                 URL: https://issues.apache.org/jira/browse/QPID-8179
>             Project: Qpid
>          Issue Type: Bug
>    Affects Versions: qpid-cpp-1.38.0
>            Reporter: Håkan Johansson
>            Priority: Major
> We are using {{qpid_messaging}} to communicate with an ActiveMQ broker using the {{amqp1.0}}
> 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.
> 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}
> #0  0x00007fd104f26945 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib64/libpthread.so.0
> #1  0x00007fd10111a420 in qpid::sys::Condition::wait (this=<optimized out>, mutex=...)
at /qpid-cpp-1.38.0/src/qpid/sys/posix/Condition.h:59
> #2  0x00007fd10112489b in wait (this=0xbaff20) at /qpid-cpp-1.38.0/src/qpid/sys/Monitor.h:41
> #3  qpid::sys::TimerTask::cancel (this=0xbafef0) at /qpid-cpp-1.38.0/src/qpid/sys/Timer.cpp:94
> #4  0x00007fd105bb367f in qpid::messaging::amqp::ConnectionContext::close (this=0xb7b350)
at /qpid-cpp-1.38.0/src/qpid/messaging/amqp/ConnectionContext.cpp:246
> {noformat}

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