Re: AMQ-CPP - Core Dump on reconnect

Fri, 01 Feb 2008 05:59:36 -0800 

Would you mind creating a JIRA issue for this?

Nate

On Feb 1, 2008, at 1:54 AM, pfid wrote:



Hello,
i'm having problems with our activemq application in production environment. the application core dumped several times during the last days when the connection to the broker was lost. each time it was either caused by the broker beeing restartet by our monitor/service application (noticing the broker having problems and restarting it, the activemq app will then notice a disconnect and recover itself), or, what is worse, write attempts failing 
(see exception below) and causing the activemq application to recover
itself. in this situation, the application will close and delete all
activemq objects (see cleanup() from web example), and recreate them/ try to open the queue after 60s waiting. the core dumps seemed to happen when the application trys to re-open the connection, but fails because the broker is 
still unreachable. here is the backtrace:




#0  activemq::connector::openwire::OpenWireConnector::closeResource
(this=0x8b4a268, resource=0x8b4dde0) at
activemq/connector/openwire/OpenWireConnector.cpp:1200
#1  0x080da6fc in activemq::connector::BaseConnectorResource::close
(this=0x8b4dde0) at activemq/connector/BaseConnectorResource.cpp:59
#2  0x0812ff50 in ~OpenWireSessionInfo (this=0x8b4dde0) at
OpenWireSessionInfo.h:56
#3  0x0812d0c4 in
activemq::connector::openwire::OpenWireConnector::createSession
(this=0x8b4dde0, ackMode=cms::Session::AUTO_ACKNOWLEDGE)
   at activemq/connector/openwire/OpenWireConnector.cpp:281
#4  0x080e86c1 in activemq::core::ActiveMQConnection::createSession
(this=0x8b4ded0, ackMode=137247624) at
activemq/core/ActiveMQConnection.cpp:98
#5  0x08059c19 in ActiveMqQueue::open (this=0x8b1d6b0,
aQueueName=0x8ab925c "outqueue", aMode=ActiveMqQueue::modeWrite,
aListenMode=0) at activemqqueue.cc:335



Debuggin shows that at
activemq/connector/openwire/OpenWireConnector.cpp:1200

1200:  dataStructure = session->getSessionInfo()->getSessionId();

the session object is null, the previously dyn-casted resource object
however is not null:




(gdb) p session
$1 = (activemq::connector::openwire::OpenWireSessionInfo *) 0x0
(gdb) p resource
$2 = (class activemq::connector::ConnectorResource *) 0x8b4dde0

(corrupt memory?)

Exception when write attempts fail:
No valid response received for command: Begin Class = ActiveMQTextMessage 
Begin Class = ActiveMQMessageBase  Value of ackHandler = 0  Value of
redeliveryCount = 0 Value of properties = Begin Class PrimitiveMap: Begin Class PrimitiveMap: Begin Class = Message Value of Message::ID_MESSAGE = 0 
Value of ProducerId is Below: Begin Class = ProducerId  Value of
ProducerId::ID_PRODUCERID = 123  Value of ConnectionId =
0c00f32b-2269-4e0f-ace1-13fd0414b4b5 Value of Value = 0 Value of SessionId = 0 No Data for Class BaseDataStructure End Class = ProducerId Value of 
Destination is Below: Begin Class = ActiveMQQueue Begin Class =
ActiveMQDestination Value of exclusive = false Value of ordered = false Value of advisory = false Value of orderedTarget = coordinator Value of 
physicalName = ffs_out  Value of options = Begin Class
activemq::util::Properties: End Class activemq::util::Properties: No Data for Class BaseDataStructure End Class = ActiveMQDestination End Class = ActiveMQQueue Value of TransactionId is Below: Object is NULL Value of 
OriginalDestination is Below:    Object is NULL  Value of MessageId is
Below: Begin Class = MessageId  Value of MessageId::ID_MESSAGEID = 110
Value of ProducerId is Below: Begin Class = ProducerId  Value of
ProducerId::ID_PRODUCERID = 123  Value of ConnectionId =
0c00f32b-2269-4e0f-ace1-13fd0414b4b5 Value of Value = 0 Value of SessionId = 0 No Data for Class BaseDataStructure End Class = ProducerId Value of ProducerSequenceId = 4 Value of BrokerSequenceId = 0 No Data for Class BaseDataStructure End Class = MessageId Value of OriginalTransactionId is Below: Object is NULL Value of GroupID = Value of GroupSequence = 0 Value of CorrelationId = Value of Persistent = 1 Value of Expiration = 1201683817204 Value of Priority = 4 Value of ReplyTo is Below: Object is NULL Value of Timestamp = 1201676617204 Value of Type = Value of 
Content[0] = , check broker.

Versions:
Activemq-cpp-2.1.1
ActiveMq Broker 4.2

the application handles 17 write-mode queues, with a rather low
messages/second rate.
Using 5.0.0 broker instead of 4.2 would most likely solve this problem, 
since the failed write attempts problem only occurs with 4.2 broker (i
reported this bug before, but it seemed like no one was interested in taking care of it). however, the broker 5.0.0 won't start with preconfigured JAAS queues, so its not an option and we have to stick with 4.2. i will try the latest snapshot these days, however i dont feel good when using a snapshot 
server in production environment.
hopefully someone can help, since core dumps in production environment cause severe problems to the whole system. in the last 3 days we had about 30 core 
dumps (eating hard disk space..).
--
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