Håkan Johansson created QPID-8438:
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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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