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From Filip Hanik - Dev Lists <devli...@hanik.com>
Subject Re: activeMq hangs after long time using
Date Tue, 19 Aug 2008 06:28:00 GMT
hi Eric,
this is classic dead lock, and it is a bug in AMQCPP, as Rob said, file 
a bug fix, but here is what is going on

thread 1, in line
#9 0x00506316 in activemq::connector::openwire::OpenWireConnector::close

it has acquired the lock
synchronized( &mutex )

then it calls
transport->close();

and this calls

thread->join();

thread in this case is your thread 2.

thread 2, in line

#16 0x0052678f in activemq::transport::IOTransport::run (this=0xb7e02410) at
has caught an exception and it invoking onTransportException,
and this is calling

activemq::connector::openwire::OpenWireConnector::onTransportException

and this is calling
synchronized( &mutex ) {

and that's where the dead lock is put in place.

this bug was introduced in 
http://svn.apache.org/viewvc/activemq/activemq-cpp/trunk/src/main/activemq/connector/openwire/OpenWireConnector.cpp?view=diff&r1=630692&r2=630693

when the mutex was added in, but the threading wasn't considered


Filip




ericc@hz.webex.com wrote:
> we use ActiveMQ 2.2 now and the issus occurs again 
>
> we have the thread info as follows:
> thread 1: the thread in our application which call the ActiveMQ cpp.
> #0  0x009517a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
> #1  0x001f20fd in pthread_join () from /lib/tls/libpthread.so.0
> #2  0x00d48b09 in apr_thread_join (retval=0xfffffffc, thd=0x82cda20) at
> threadproc/unix/thread.c:217
> #3  0x00567b7f in decaf::lang::Thread::join (this=0xb7e026c8) at
> decaf/lang/Thread.cpp:87
> #4  0x00525e8d in activemq::transport::IOTransport::close (this=0xb7e02410)
> at activemq/transport/IOTransport.cpp:163
> #5  0x005314bb in activemq::transport::filters::TcpTransport::close
> (this=0xb7e01fe0) at ./activemq/transport/TransportFilter.h:209
> #6  0x0052edf1 in activemq::transport::filters::AsyncSendTransport::close
> (this=0xb7e021e8) at activemq/transport/filters/AsyncSendTransport.cpp:96
> #7  0x0052a9a5 in activemq::transport::filters::ResponseCorrelator::close
> (this=0xb7e00878)
>     at activemq/transport/filters/ResponseCorrelator.cpp:252
> #8  0x0050166d in
> activemq::connector::openwire::OpenWireFormatNegotiator::close
> (this=0xb7e02610)
>     at activemq/connector/openwire/OpenWireFormatNegotiator.cpp:228
> #9  0x00506316 in activemq::connector::openwire::OpenWireConnector::close
> (this=0xb7e019e8)
>     at activemq/connector/openwire/OpenWireConnector.cpp:177
> #10 0x005089db in ~OpenWireConnector (this=0xb7e019e8) at
> activemq/connector/openwire/OpenWireConnector.cpp:116
> #11 0x004ac5d0 in
> activemq::core::ActiveMQConnectionFactory::createConnection
> (url=@0xb7e00b44, username=@0xb7e00b3c, password=@0xb7e00b40,
>     clientId=@0x197a650) at activemq/core/ActiveMQConnectionFactory.cpp:177
> #12 0x004acbf2 in
> activemq::core::ActiveMQConnectionFactory::createConnection
> (this=0xb7e00b38) at activemq/core/ActiveMQConnectionFactory.cpp:67
> #13 0x0807aefd in CCommonActiveMQConnector::CreateConnection
> (this=0xb7e01ce8) at CommonActiveMQConnector.cpp:358
>
> thread 2: the ActiveMQ thread.
> #0  0x009517a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
> #1  0x001f61de in __lll_mutex_lock_wait () from /lib/tls/libpthread.so.0
> #2  0x001f2e47 in _L_mutex_lock_179 () from /lib/tls/libpthread.so.0
> #3  0x0237f1a8 in ?? ()
> #4  0x00d4d92c in ?? () from /opt/webex/tricon/bin/libapr-1.so.0
> #5  0xb7e01a3c in ?? ()
> #6  0x0237fbb0 in ?? ()
> #7  0x0237f1b8 in ?? ()
> #8  0x00d3dea7 in apr_thread_mutex_lock (mutex=0x82c58dc) at
> locks/unix/thread_mutex.c:92
> #9  0x00d3dea7 in apr_thread_mutex_lock (mutex=0x82c58d8) at
> locks/unix/thread_mutex.c:92
> #10 0x00581671 in decaf::util::concurrent::Mutex::lock (this=0x1f61de) at
> decaf/util/concurrent/Mutex.cpp:53
> #11 0x00505349 in
> activemq::connector::openwire::OpenWireConnector::onTransportException
> (this=0xb7e019e8, source=0xb7e02610, ex=@0x237f3a4)
>     at ./decaf/util/concurrent/Lock.h:94
> #12 0x00502331 in
> activemq::connector::openwire::OpenWireFormatNegotiator::onTransportException
> (this=0xb7e02610, source=0xb7e00878, ex=@0x237f3a4)
>     at ./activemq/transport/TransportFilter.h:74
> #13 0x00524919 in activemq::transport::TransportFilter::onTransportException
> (this=0xb7e00878, source=0xb7e021e8, ex=@0x237f3a4)
>     at activemq/transport/TransportFilter.h:74
> #14 0x00524919 in activemq::transport::TransportFilter::onTransportException
> (this=0xb7e021e8, source=0xb7e01fe0, ex=@0x237f3a4)
>     at activemq/transport/TransportFilter.h:74
> #15 0x00524919 in activemq::transport::TransportFilter::onTransportException
> (this=0xb7e01fe0, source=0xb7e02410, ex=@0x237f3a4)
>     at activemq/transport/TransportFilter.h:74
> #16 0x0052678f in activemq::transport::IOTransport::run (this=0xb7e02410) at
> activemq/transport/IOTransport.h:105
> #17 0x00567c59 in decaf::lang::Thread::runCallback (self=0x82cda20,
> param=0xb7e026c8) at decaf/lang/Thread.cpp:113
> #18 0x00d489a4 in dummy_worker (opaque=0xfffffffc) at
> threadproc/unix/thread.c:142
> #19 0x001f1371 in start_thread () from /lib/tls/libpthread.so.0
> #20 0x00853ffe in clone () from /lib/tls/libc.so.6
>
>
> ericc@hz.webex.com wrote:
>   
>> thanks for caring,
>> the answer is :yes. we use activeMQ cpp 2.1.3 . and the version of the
>> activeMq broker is 5.5.
>>
>>
>> rajdavies wrote:
>>     
>>> Do you mean the cpp client?  - what version is the activemq broker ?
>>>
>>> On 18 Aug 2008, at 07:48, ericc@hz.webex.com wrote:
>>>
>>>       
>>>> we use client activeMq2.1 .
>>>> the logic flow is as follows:
>>>> step1:there will be disconnection with activeMq server in about 5  
>>>> minutes,
>>>> step2:a onexception to activeMQ client ,then client reconnect to the
>>>> activeMQ server.
>>>> step3:reconnect ok and return to step1.
>>>> the issue is :after about 300--400 times  successful reconnection, the
>>>> Client Hangs up.
>>>>
>>>> is there anyone know this issue and how to correct it
>>>> thanks.
>>>> -- 
>>>> View this message in context:
>>>> http://www.nabble.com/activeMq-hangs-after-long-time-using-tp19026674p19026674.html
>>>> Sent from the ActiveMQ - Dev mailing list archive at Nabble.com.
>>>>
>>>>         
>>>
>>>       
>>     
>
>   


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