Håkan Johansson created QPID-8179:
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Summary: 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
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.
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-1.36.0/src/qpid/sys/posix/Condition.h:59
#2 0x00007fd10112489b in wait (this=0xbaff20) at
/qpid-cpp-1.36.0/src/qpid/sys/Monitor.h:41
#3 qpid::sys::TimerTask::cancel (this=0xbafef0) at
/qpid-cpp-1.36.0/src/qpid/sys/Timer.cpp:94
#4 0x00007fd105bb367f in qpid::messaging::amqp::ConnectionContext::close
(this=0xb7b350) at
/qpid-cpp-1.36.0/src/qpid/messaging/amqp/ConnectionContext.cpp:246
{noformat}
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