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From rspringer <rsprin...@etinternational.com>
Subject Re: C++ Broker: segfault in TopicExchange::isBound()
Date Mon, 06 Jul 2009 12:51:46 GMT

Carl - Sorry for the delay, I was out of the office for most of last week.  I
have what I THINK is an accurate core (my binary has been re-created since I
generated it, but looking over it, the relevant sections appear accurate)
and the associated dumps.  If you'd like / need, let me know and I can
revert my changes and re-generate.

Below are the backtraces - thanks for checking this out (thread 1 is the
interesting one)!
-Rob

#0  0x0000003ebb25c213 in std::_Rb_tree_increment () from
/usr/lib64/libstdc++.so.6      
(gdb) thread apply all bt

Thread 8 (process 20504):
#0  0x0000003eb85c9c5c in epoll_wait () from /lib64/tls/libc.so.6
#1  0x0000002a95c56b67 in qpid::sys::Poller::wait (this=0x533250,
timeout={nanosecs = 9223372036854775807})
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:432                  
                 
#2  0x0000002a95c56a07 in qpid::sys::Poller::run (this=0x533250) at
../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:398
#3  0x0000002a95cb21da in qpid::sys::Dispatcher::run (this=0x7fbffff0e0) at
../../../src/qpid-0.5/cpp/src/qpid/sys/Dispatcher.cpp:37
#4  0x0000002a9573cd05 in qpid::broker::Broker::run (this=0x534160) at
../../../src/qpid-0.5/cpp/src/qpid/broker/Broker.cpp:319     
#5  0x00000000004102fb in QpiddBroker::execute (this=0x7fbffff3b7,
options=0x52bfa0) at ../../../src/qpid-0.5/cpp/src/posix/QpiddBroker.cpp:165
#6  0x000000000040d9af in main (argc=3, argv=0x7fbffff6f8) at
../../../src/qpid-0.5/cpp/src/qpidd.cpp:77                                       

Thread 7 (process 20505):
#0  0x0000002a9575cd76 in
boost::intrusive_ptr<qpid::broker::Message>::operator-> (this=0x409efe80)
    at /home/rspringer/opt/include/boost/smart_ptr/intrusive_ptr.hpp:149                 
         
#1  0x0000002a95814ff1 in qpid::management::ManagementBroker::sendBuffer
(this=0x2a96741010, buf=@0x409eff50, length=103, exchange=
        {px = 0x538a20, pn = {pi_ = 0x538ce0}}, routingKey=                              
                                         
        {static npos = 18446744073709551615, _M_dataplus =
{<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No
data
fields>}, <No data fields>}, _M_p = 0x2a976ada38
"console.obj.1.0.org.apache.qpid.broker.binding"}})                                      
                        
    at
../../../src/qpid-0.5/cpp/src/qpid/management/ManagementBroker.cpp:304                   
                                                  
#2  0x0000002a95815a20 in
qpid::management::ManagementBroker::periodicProcessing (this=0x2a96741010)               
                               
    at
../../../src/qpid-0.5/cpp/src/qpid/management/ManagementBroker.cpp:388                   
                                                  
#3  0x0000002a95814b21 in Periodic (this=0x0, _broker=@0x2a96741148,
_seconds=42)                                                                  
    at
../../../src/qpid-0.5/cpp/src/qpid/management/ManagementBroker.cpp:245                   
                                                  
#4  0x0000002a95804f74 in qpid::broker::Timer::run (this=0x2a96741140) at
../../../src/qpid-0.5/cpp/src/qpid/broker/Timer.cpp:67                   
#5  0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x2a96741140)                                                           
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35                        
                                                         
#6  0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0                
                                                         
#7  0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6                             
                                                         
#8  0x0000000000000000 in ?? ()                                                          
                                                         

Thread 6 (process 20506):
#0  0x0000003eb8c08d2f in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib64/tls/libpthread.so.0
#1  0x0000002a958053d7 in qpid::sys::Condition::wait (this=0x534558,
mutex=@0x534530, absoluteTime=@0x2a97ea5048)
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Condition.h:69                       
                       
#2  0x0000002a9580538f in qpid::sys::Monitor::wait (this=0x534530,
absoluteTime=@0x2a97ea5048)                   
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/Monitor.h:45                               
                       
#3  0x0000002a95804fb2 in qpid::broker::Timer::run (this=0x534528) at
../../../src/qpid-0.5/cpp/src/qpid/broker/Timer.cpp:69
#4  0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x534528) at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35
#5  0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0                
                                                        
#6  0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6                             
                                                        
#7  0x0000000000000000 in ?? ()                                                          
                                                        

Thread 5 (process 20507):
#0  0x0000003eb8c08d2f in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib64/tls/libpthread.so.0
#1  0x0000002a958053d7 in qpid::sys::Condition::wait (this=0x534620,
mutex=@0x5345f8, absoluteTime=@0x538d88)
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Condition.h:69                       
                   
#2  0x0000002a9580538f in qpid::sys::Monitor::wait (this=0x5345f8,
absoluteTime=@0x538d88) at
../../../src/qpid-0.5/cpp/src/qpid/sys/Monitor.h:45
#3  0x0000002a95804fb2 in qpid::broker::Timer::run (this=0x5345f0) at
../../../src/qpid-0.5/cpp/src/qpid/broker/Timer.cpp:69                     
#4  0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x5345f0) at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35
#5  0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0                
                                                        
#6  0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6                             
                                                        
#7  0x0000000000000000 in ?? ()                                                          
                                                        

Thread 4 (process 20508):
#0  0x0000003eb85c9c5c in epoll_wait () from /lib64/tls/libc.so.6
#1  0x0000002a95c56b67 in qpid::sys::Poller::wait (this=0x533250,
timeout={nanosecs = 9223372036854775807})
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:432                  
                 
#2  0x0000002a95c56a07 in qpid::sys::Poller::run (this=0x533250) at
../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:398
#3  0x0000002a95cb21da in qpid::sys::Dispatcher::run (this=0x7fbffff0e0) at
../../../src/qpid-0.5/cpp/src/qpid/sys/Dispatcher.cpp:37
#4  0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x7fbffff0e0)                                            
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35                        
                                          
#5  0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0                
                                          
#6  0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6                             
                                          
#7  0x0000000000000000 in ?? ()                                                          
                                          

Thread 3 (process 20509):
#0  0x0000003eb85c9c5c in epoll_wait () from /lib64/tls/libc.so.6
#1  0x0000002a95c56b67 in qpid::sys::Poller::wait (this=0x533250,
timeout={nanosecs = 9223372036854775807})
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:432                  
                 
#2  0x0000002a95c56a07 in qpid::sys::Poller::run (this=0x533250) at
../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:398
#3  0x0000002a95cb21da in qpid::sys::Dispatcher::run (this=0x7fbffff0e0) at
../../../src/qpid-0.5/cpp/src/qpid/sys/Dispatcher.cpp:37
#4  0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x7fbffff0e0)                                            
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35                        
                                          
#5  0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0                
                                          
#6  0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6                             
                                          
#7  0x0000000000000000 in ?? ()                                                          
                                          

Thread 2 (process 20511):
#0  0x0000003eb85c9c5c in epoll_wait () from /lib64/tls/libc.so.6
#1  0x0000002a95c56b67 in qpid::sys::Poller::wait (this=0x533250,
timeout={nanosecs = 9223372036854775807})
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:432                  
                 
#2  0x0000002a95c56a07 in qpid::sys::Poller::run (this=0x533250) at
../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:398
#3  0x0000002a95cb21da in qpid::sys::Dispatcher::run (this=0x7fbffff0e0) at
../../../src/qpid-0.5/cpp/src/qpid/sys/Dispatcher.cpp:37
#4  0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x7fbffff0e0)                                            
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35                        
                                          
#5  0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0                
                                          
#6  0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6                             
                                          
#7  0x0000000000000000 in ?? ()                                                          
                                          

Thread 1 (process 20510):
#0  0x0000003ebb25c213 in std::_Rb_tree_increment () from
/usr/lib64/libstdc++.so.6
#1  0x0000002a9580a583 in
std::_Rb_tree_iterator<std::pair<qpid::broker::TopicPattern const,
qpid::broker::TopicExchange::BoundKey> >::operator++
    (this=0x2a9580a583) at
/usr/lib/gcc/x86_64-redhat-linux/3.4.6/../../../../include/c++/3.4.6/bits/stl_tree.h:187 
                            
#2  0x0000002a95808d58 in qpid::broker::TopicExchange::isBound
(this=0x537ee0, queue={px = 0x2a979719f0, pn = {pi_ = 0x2a97971a18}},             
    routingKey=0x2a9791eb90) at
../../../src/qpid-0.5/cpp/src/qpid/broker/TopicExchange.cpp:297                          
                       
#3  0x0000002a957eb4fd in
qpid::broker::SessionAdapter::ExchangeHandlerImpl::bound (this=0xbe90f8,
exchangeName=@0x2a9791eb80,                   
    queueName=@0x2a9791eb88, key=@0x2a9791eb90, args=@0x2a9791eb98) at
../../../src/qpid-0.5/cpp/src/qpid/broker/SessionAdapter.cpp:256          
#4  0x0000002a95c2f6ee in
qpid::framing::ExchangeBoundBody::invoke<qpid::framing::AMQP_ServerOperations::ExchangeHandler>
(this=0x2a9791eb70,    
    invocable=@0xbe90f8) at gen/qpid/framing/ExchangeBoundBody.h:88                      
                                                       
#5  0x0000002a95c2dce3 in
qpid::framing::AMQP_ServerOperations::ExchangeHandler::Invoker::visit
(this=0x43c03bc0, body=@0x2a9791eb70)            
    at gen/qpid/framing/ServerInvoker.cpp:650                                            
                                                       
#6  0x0000002a95c0e278 in qpid::framing::ExchangeBoundBody::accept
(this=0x2a9791eb70, v=@0x43c03bc0) at
gen/qpid/framing/ExchangeBoundBody.h:92 
#7  0x0000002a95c2c685 in
qpid::framing::AMQP_ServerOperations::Invoker::visit (this=0x43c03c40,
body=@0x2a9791eb70)                             
    at gen/qpid/framing/ServerInvoker.cpp:363                                            
                                                       
#8  0x0000002a95c0e278 in qpid::framing::ExchangeBoundBody::accept
(this=0x2a9791eb70, v=@0x43c03c40) at
gen/qpid/framing/ExchangeBoundBody.h:92 
#9  0x0000002a957fc3dc in
qpid::framing::invoke<qpid::broker::SessionAdapter> (target=@0xbe90e0,
body=@0x2a9791eb70)                             
    at ../../../src/qpid-0.5/cpp/src/qpid/framing/Invoker.h:67                           
                                                       
#10 0x0000002a957f9a78 in qpid::broker::SessionState::handleCommand
(this=0xbe8db0, method=0x2a9791eb70, id=@0x43c03ec0)                         
    at ../../../src/qpid-0.5/cpp/src/qpid/broker/SessionState.cpp:189                    
                                                       
#11 0x0000002a957faaf7 in qpid::broker::SessionState::handleIn
(this=0xbe8db0, frame=@0x43c04420)                                                
    at ../../../src/qpid-0.5/cpp/src/qpid/broker/SessionState.cpp:323                    
                                                       
#12 0x0000002a957fda37 in
qpid::framing::Handler<qpid::framing::AMQFrame&>::MemFunRef<qpid::framing::Handler<qpid::framing::AMQFrame&>::InOutHandlerInterface,
&(qpid::framing::Handler<qpid::framing::AMQFrame&>::InOutHandlerInterface::handleIn(qpid::framing::AMQFrame&))>::handle
(              
    this=0xbe8f40, t=@0x43c04420) at
../../../src/qpid-0.5/cpp/src/qpid/framing/Handler.h:67                                  
                    
#13 0x0000002a95c7ca57 in qpid::amqp_0_10::SessionHandler::handleIn
(this=0xd55f20, f=@0x43c04420)                                                 
    at ../../../src/qpid-0.5/cpp/src/qpid/amqp_0_10/SessionHandler.cpp:86                
                                                         
#14 0x0000002a957fda37 in
qpid::framing::Handler<qpid::framing::AMQFrame&>::MemFunRef<qpid::framing::Handler<qpid::framing::AMQFrame&>::InOutHandlerInterface,
&(qpid::framing::Handler<qpid::framing::AMQFrame&>::InOutHandlerInterface::handleIn(qpid::framing::AMQFrame&))>::handle
(              
    this=0xd55f30, t=@0x43c04420) at
../../../src/qpid-0.5/cpp/src/qpid/framing/Handler.h:67                                  
                    
#15 0x0000002a9577a10e in
qpid::framing::Handler<qpid::framing::AMQFrame&>::operator() (this=0xd55f30,
t=@0x43c04420)                              
    at ../../../src/qpid-0.5/cpp/src/qpid/framing/Handler.h:42                           
                                                         
#16 0x0000002a95777854 in qpid::broker::Connection::received (this=0xca54d0,
frame=@0x43c04420)                                                    
    at ../../../src/qpid-0.5/cpp/src/qpid/broker/Connection.cpp:106                      
                                                         
#17 0x0000002a95733199 in qpid::amqp_0_10::Connection::decode
(this=0xb9a170, buffer=0xc61eb0 "\017\001", size=166)                                
    at ../../../src/qpid-0.5/cpp/src/qpid/amqp_0_10/Connection.cpp:55                    
                                                         
#18 0x0000002a957d9ecc in qpid::broker::SecureConnection::decode
(this=0xd33100, buffer=0xc61eb0 "\017\001", size=166)                             
    at ../../../src/qpid-0.5/cpp/src/qpid/broker/SecureConnection.cpp:42                 
                                                         
#19 0x0000002a95cb0a7d in qpid::sys::AsynchIOHandler::readbuff
(this=0xc9e520, buff=0xbee030)                                                      
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/AsynchIOHandler.cpp:104                    
                                                         
#20 0x0000002a95825674 in
boost::detail::function::functor_manager_common<boost::_bi::bind_t<bool,
boost::_mfi::mf2<bool, qpid::sys::AsynchIOHandler, qpid::sys::AsynchIO&,
qpid::sys::AsynchIOBufferBase*>,
boost::_bi::list3<boost::_bi::value<qpid::sys::AsynchIOHandler*>,
boost::arg<1> (*)(), boost::arg<2> (*)()> > >::manage_small
(in_buffer=@0xc9e520, out_buffer=@0xbe5160,
op=boost::detail::function::clone_functor_tag)
    at /home/rspringer/opt/include/boost/function/function_base.hpp:307
#21 0x0000002a95824dff in
boost::detail::function::functor_manager<boost::_bi::bind_t<void,
boost::_mfi::mf4<void, qpid::sys::AsynchIOProtocolFactory,
boost::shared_ptr<qpid::sys::Poller>, qpid::sys::Socket const&,
qpid::sys::ConnectionCodec::Factory*, bool>,
boost::_bi::list5<boost::_bi::value<qpid::sys::AsynchIOProtocolFactory*>,
boost::_bi::value<boost::shared_ptr<qpid::sys::Poller> >, boost::arg<1>
(*)(), boost::_bi::value<qpid::sys::ConnectionCodec::Factory*>,
boost::_bi::value<bool> > > >::manager (in_buffer=@0x3eb8c0d340,
out_buffer=@0xbe5168,
    op=boost::detail::function::clone_functor_tag) at
/home/rspringer/opt/include/boost/function/function_base.hpp:395
#22 0x0000002a95824995 in storage5 (this=0x43c04af8, a1={t_ = 0x3eb8c0d300},
a2={t_ = {px = 0x2a96c00128, pn = {pi_ = 0x2a97c4df10}}},
    a3=0x43c04af8, a4={t_ = 0xbe5160}, a5={t_ = false}) at
/home/rspringer/opt/include/boost/bind/storage.hpp:227
#23 0x0000002a9582450b in bind_t (this=0xbe5270, f={f_ = 0xbe5270, this
adjustment 12509232}, l=@0x2a9582450b)
    at /home/rspringer/opt/include/boost/bind/bind.hpp:859
#24 0x0000002a95c4b756 in boost::function2<bool, qpid::sys::AsynchIO&,
qpid::sys::AsynchIOBufferBase*>::operator() (this=0xbe5268, a0=@0xbe5160,
    a1=0xbee030) at
/home/rspringer/opt/include/boost/function/function_template.hpp:988
#25 0x0000002a95c49548 in qpid::sys::posix::AsynchIO::readable
(this=0xbe5160, h=@0xbe5168)
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/AsynchIO.cpp:446
#26 0x0000002a95c4efd8 in boost::_mfi::mf1<void, qpid::sys::posix::AsynchIO,
qpid::sys::DispatchHandle&>::operator() (this=0xbe5180, p=0xbe5160,
    a1=@0xbe5168) at
/home/rspringer/opt/include/boost/bind/mem_fn_template.hpp:162
#27 0x0000002a95c4e609 in
boost::_bi::list2<boost::_bi::value<qpid::sys::posix::AsynchIO*>,
boost::arg<1> (*)()>::operator()<boost::_mfi::mf1<void,
qpid::sys::posix::AsynchIO, qpid::sys::DispatchHandle&>,
boost::_bi::list1<qpid::sys::DispatchHandle&> > (this=0xbe5190, f=@0xbe5180,
    a=@0x43c04e20) at /home/rspringer/opt/include/boost/bind/bind.hpp:306
#28 0x0000002a95c4dcdd in boost::_bi::bind_t<void, boost::_mfi::mf1<void,
qpid::sys::posix::AsynchIO, qpid::sys::DispatchHandle&>,
boost::_bi::list2<boost::_bi::value<qpid::sys::posix::AsynchIO*>,
boost::arg<1> (*)()> >::operator()<qpid::sys::DispatchHandle>
(this=0xbe5180, a1=@0xbe5168)
    at /home/rspringer/opt/include/boost/bind/bind_template.hpp:32
#29 0x0000002a95c4d095 in
boost::detail::function::void_function_obj_invoker1<boost::_bi::bind_t<void,
boost::_mfi::mf1<void, qpid::sys::posix::AsynchIO,
qpid::sys::DispatchHandle&>,
boost::_bi::list2<boost::_bi::value<qpid::sys::posix::AsynchIO*>,
boost::arg<1> (*)()> >, void, qpid::sys::DispatchHandle&>::invoke
(function_obj_ptr=@0xbe5180, a0=@0xbe5168) at
/home/rspringer/opt/include/boost/function/function_template.hpp:152
#30 0x0000002a95cb432e in boost::function1<void,
qpid::sys::DispatchHandle&>::operator() (this=0xbe5178, a0=@0xbe5168)
    at /home/rspringer/opt/include/boost/function/function_template.hpp:988
#31 0x0000002a95cb3b96 in qpid::sys::DispatchHandle::processEvent
(this=0xbe5168, type=qpid::sys::Poller::READABLE)
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/DispatchHandle.cpp:428
#32 0x0000002a95c57d43 in qpid::sys::Poller::Event::process
(this=0x43c05030) at ../../../src/qpid-0.5/cpp/src/qpid/sys/Poller.h:122
#33 0x0000002a95c56a2b in qpid::sys::Poller::run (this=0x533250) at
../../../src/qpid-0.5/cpp/src/qpid/sys/epoll/EpollPoller.cpp:402
#34 0x0000002a95cb21da in qpid::sys::Dispatcher::run (this=0x7fbffff0e0) at
../../../src/qpid-0.5/cpp/src/qpid/sys/Dispatcher.cpp:37
#35 0x0000002a95c510b0 in qpid::sys::(anonymous namespace)::runRunnable
(p=0x7fbffff0e0)
    at ../../../src/qpid-0.5/cpp/src/qpid/sys/posix/Thread.cpp:35
#36 0x0000003eb8c06137 in start_thread () from /lib64/tls/libpthread.so.0
#37 0x0000003eb85c9883 in clone () from /lib64/tls/libc.so.6
#38 0x0000000000000000 in ?? ()




Carl Trieloff wrote:
> 
> 
> Rob,
> 
> are you able to do a
> 
> 'thread apply all bt'
> 
> on the core. That will allow us to reason through your theory with you
> 
> Carl.
> 
> 
> rspringer@mail.etinternational.com wrote:
>> All,
>> We've been using Qpid M4 and 0.5 internally, both with C++, and have been
>> seeing occasional segfaults within the broker.  They all seem to occur
>> inside TopicExchange::isBound() (the one with 3 parameters, not 2).
>>
>> Looking at the access patterns in this function, and judging by the
>> core dumps, it appears that multiple threads may access and modify
>> the class member "bindings" simultaneously, which seems like it
>> has the potential to cause a segfault.
>>
>> Since this is a race condition (if we're right), it's hard to
>> say for sure that the problem has been resolved, but since doing
>> the below, we've not had a segfault (roughly 5 hours so far,
>> rather than every 2-3 hours or so).
>>  - We added locks to all accesses of bindings throughout the
>>    file.  I believe the new ones were limited to isBound.
>>  - This may not be necessary at all, but to be safe (while
>>    we were investigating the problem), we changed all lock
>>    types from RWlock::ScopedLocks to Mutex::ScopedLocks, to avoid
>>    being tripped up by pthread (read/write) mutex semantics.
>>
>> We wanted to get the opinion of the experienced Qpid developers
>> on this list before opening a bug, but again, so far it seems to
>> be much more stable (we're hammering on Session::exchangeBound()
>> in our testing, which may be why we're seeing it in the first place).
>>
>> I'm not sure if the other exchange types have the same problem or not.
>>
>> Thanks!
>> -Rob
>>
>>
>>
>> ---------------------------------------------------------------------
>> Apache Qpid - AMQP Messaging Implementation
>> Project:      http://qpid.apache.org
>> Use/Interact: mailto:dev-subscribe@qpid.apache.org
>>
>>   
> 
> 
> ---------------------------------------------------------------------
> Apache Qpid - AMQP Messaging Implementation
> Project:      http://qpid.apache.org
> Use/Interact: mailto:dev-subscribe@qpid.apache.org
> 
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