Bug 589287 - broker deadlock between InactivityFireEvent::fire() and MessageStoreImpl::dequeue()
broker deadlock between InactivityFireEvent::fire() and MessageStoreImpl::deq...
Status: CLOSED NOTABUG
Product: Red Hat Enterprise MRG
Classification: Red Hat
Component: qpid-cpp (Show other bugs)
Development
All Linux
urgent Severity urgent
: 1.3
: ---
Assigned To: Kim van der Riet
MRG Quality Engineering
:
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2010-05-05 14:32 EDT by Gordon Sim
Modified: 2010-05-17 03:42 EDT (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2010-05-17 03:42:37 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description Gordon Sim 2010-05-05 14:32:16 EDT
Description of problem:

Deadlock in broker.

Version-Release number of selected component (if applicable):

qpid-cpp-server-0.7.935473-1.el5

How reproducible:

Not sure

Steps to Reproduce:
1. run durable perftest with severl pubs/subs
  
Actual results:

Broker hangs:

Thread 5 (Thread 0x410c9940 (LWP 19752)):
#0  0x00000038fa40af70 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
#1  0x00000039d24074d8 in qpid::sys::Timer::run ()
#2  0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#3  0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#4  0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 4 (Thread 0x4200b940 (LWP 19753)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa408c3a in _L_lock_1034 () from /lib64/libpthread.so.0
#2  0x00000038fa408afc in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00002b85ee95b65a in mrg::journal::slock::slock ()
#4  0x00002b85ee96742c in mrg::journal::jcntl::flush ()
#5  0x00002b85ee918b0b in mrg::msgstore::JournalImpl::flush ()
#6  0x00002b85ee918dc6 in mrg::msgstore::JournalImpl::flushFire ()
#7  0x00002b85ee918e4c in mrg::msgstore::InactivityFireEvent::fire ()
#8  0x00000039d2407123 in qpid::sys::Timer::run ()
#9  0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#10 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#11 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 3 (Thread 0x42a0c940 (LWP 19754)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa40b16b in pthread_cond_signal@@GLIBC_2.3.2 ()
#2  0x00000039d29581fd in qpid::broker::IncompleteMessageList::enqueueComplete
#3  0x00000039d29596df in boost::function1<void, boost::intrusive_ptr<qpid::broker::Message> const&, std::allocator<void> >::operator() ()
#4  0x00000039d2975425 in qpid::broker::Message::allEnqueuesComplete ()
#5  0x00000039d297c339 in qpid::broker::PersistableMessage::enqueueComplete ()
#6  0x00002b85ee916d86 in mrg::msgstore::JournalImpl::wr_aio_cb ()
#7  0x00002b85ee9894a7 in mrg::journal::wmgr::get_events ()
#8  0x00002b85ee98bd7f in mrg::journal::wmgr::write_flush ()
#9  0x00002b85ee98c14d in mrg::journal::wmgr::flush_check ()
#10 0x00002b85ee98d0bc in mrg::journal::wmgr::dequeue ()
#11 0x00002b85ee968064 in mrg::journal::jcntl::dequeue_data_record ()
#12 0x00002b85ee91c973 in mrg::msgstore::JournalImpl::dequeue_data_record ()
#13 0x00002b85ee9277ea in mrg::msgstore::MessageStoreImpl::async_dequeue ()
#14 0x00002b85ee93761f in mrg::msgstore::MessageStoreImpl::dequeue ()
#15 0x00000039d29794eb in qpid::broker::MessageStoreModule::dequeue ()
#16 0x00000039d2983db7 in qpid::broker::Queue::dequeue ()
#17 0x00000039d29b2674 in qpid::broker::SemanticState::ConsumerImpl::deliver ()
#18 0x00000039d2985eac in qpid::broker::Queue::dispatch ()
#19 0x00000039d29b29c4 in qpid::broker::SemanticState::ConsumerImpl::doOutput
#20 0x00000039d23f9a87 in qpid::sys::AggregateOutput::doOutput ()
#21 0x00000039d29201e1 in qpid::broker::Connection::doOutput ()
#22 0x00000039d28fe616 in qpid::amqp_0_10::Connection::canEncode ()
#23 0x00000039d29b0bda in qpid::broker::SecureConnection::canEncode ()
#24 0x00000039d23fd7a5 in qpid::sys::AsynchIOHandler::idle ()
#25 0x00000039d231e14f in boost::function1<void, qpid::sys::AsynchIO&, std::allocator<boost::function_base> >::operator() () from /usr/lib64/libqpidcommon.so.2
#26 0x00000039d231bb2f in qpid::sys::posix::AsynchIO::writeable ()
#27 0x00000039d2404e97 in boost::function1<void, qpid::sys::DispatchHandle&, std::allocator<boost::function_base> >::operator() ()
#28 0x00000039d23ffde7 in qpid::sys::DispatchHandle::processEvent ()
#29 0x00000039d2329fff in qpid::sys::Poller::run ()
#30 0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#31 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#32 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 2 (Thread 0x4480f940 (LWP 19757)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa408c3a in _L_lock_1034 () from /lib64/libpthread.so.0
#2  0x00000038fa408afc in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00002b85ee95b65a in mrg::journal::slock::slock ()
#4  0x00002b85ee968052 in mrg::journal::jcntl::dequeue_data_record ()
#5  0x00002b85ee91c973 in mrg::msgstore::JournalImpl::dequeue_data_record ()
#6  0x00002b85ee9277ea in mrg::msgstore::MessageStoreImpl::async_dequeue ()
#7  0x00002b85ee93761f in mrg::msgstore::MessageStoreImpl::dequeue ()
#8  0x00000039d29794eb in qpid::broker::MessageStoreModule::dequeue ()
#9  0x00000039d2983db7 in qpid::broker::Queue::dequeue ()
#10 0x00000039d298418c in qpid::broker::Queue::popAndDequeue ()
#11 0x00000039d29846ba in qpid::broker::Queue::purge ()
#12 0x00000039d29c884f in qpid::broker::SessionAdapter::QueueHandlerImpl::purge
#13 0x00000039d23467b2 in qpid::framing::AMQP_ServerOperations::QueueHandler::Invoker::visit () from /usr/lib64/libqpidcommon.so.2
#14 0x00000039d234cf17 in qpid::framing::AMQP_ServerOperations::Invoker::visit
#15 0x00000039d29e16e3 in qpid::framing::invoke<qpid::broker::SessionAdapter>
#16 0x00000039d29dff7d in qpid::broker::SessionState::handleCommand ()
#17 0x00000039d29e0ef9 in qpid::broker::SessionState::handleIn ()
#18 0x00000039d23b9fa9 in qpid::amqp_0_10::SessionHandler::handleIn ()
#19 0x00000039d291dee2 in qpid::broker::Connection::received ()
#20 0x00000039d28fdd84 in qpid::amqp_0_10::Connection::decode ()
#21 0x00000039d23fde11 in qpid::sys::AsynchIOHandler::readbuff ()
#22 0x00000039d231de4f in boost::function2<void, qpid::sys::AsynchIO&, qpid::sys::AsynchIOBufferBase*, std::allocator<boost::function_base> >::operator() ()
#23 0x00000039d231c3b3 in qpid::sys::posix::AsynchIO::readable ()
#24 0x00000039d2404e97 in boost::function1<void, qpid::sys::DispatchHandle&, std::allocator<boost::function_base> >::operator() ()
#25 0x00000039d23ffd2f in qpid::sys::DispatchHandle::processEvent ()
#26 0x00000039d2329fff in qpid::sys::Poller::run ()
#27 0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#28 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#29 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x2b85ec35f830 (LWP 19751)):
#0  0x00000038fa407955 in pthread_join () from /lib64/libpthread.so.0
#1  0x00000039d23203cd in qpid::sys::Thread::join ()
#2  0x00000039d290a311 in qpid::broker::Broker::run ()
#3  0x0000000000406ae6 in ?? ()
#4  0x00000000004055af in __cxa_pure_virtual ()
#5  0x00000038f9c1d994 in __libc_start_main () from /lib64/libc.so.6
#6  0x0000000000405019 in __cxa_pure_virtual ()
#7  0x00007fffabd2a678 in ?? ()
#8  0x0000000000000000 in ?? ()
Comment 1 Gordon Sim 2010-05-06 13:19:05 EDT
Another occurence, it appears relatively easy (I got it well within 50 loops) to trigger this via:

   while perftest --qt 2 --nsubs 4 --npubs 2 --sub-ack 10 --durable true --count 50000 --summary; do true; done

Thread 7 (Thread 0x40d70940 (LWP 6789)):
#0  0x00000038fa40af70 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
#1  0x00000039d24074d8 in qpid::sys::Timer::run ()
#2  0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#3  0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#4  0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 6 (Thread 0x41771940 (LWP 6790)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa408c3a in _L_lock_1034 () from /lib64/libpthread.so.0
#2  0x00000038fa408afc in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00002b761173865a in mrg::journal::slock::slock ()
#4  0x00002b761174442c in mrg::journal::jcntl::flush ()
#5  0x00002b76116f5b0b in mrg::msgstore::JournalImpl::flush ()
#6  0x00002b76116f5dc6 in mrg::msgstore::JournalImpl::flushFire ()
#7  0x00002b76116f5e4c in mrg::msgstore::InactivityFireEvent::fire ()
#8  0x00000039d2407123 in qpid::sys::Timer::run ()
#9  0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#10 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#11 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 5 (Thread 0x429a5940 (LWP 6791)):
#0  0x00000038f9cd4018 in epoll_wait () from /lib64/libc.so.6
#1  0x00000039d23295af in qpid::sys::Poller::wait ()
#2  0x00000039d2329fd2 in qpid::sys::Poller::run ()
#3  0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#4  0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#5  0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 4 (Thread 0x433a6940 (LWP 6792)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa408c3a in _L_lock_1034 () from /lib64/libpthread.so.0
#2  0x00000038fa408afc in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00002b761173865a in mrg::journal::slock::slock ()
#4  0x00002b7611745052 in mrg::journal::jcntl::dequeue_data_record ()
#5  0x00002b76116f9973 in mrg::msgstore::JournalImpl::dequeue_data_record ()
#6  0x00002b76117047ea in mrg::msgstore::MessageStoreImpl::async_dequeue ()
#7  0x00002b761171461f in mrg::msgstore::MessageStoreImpl::dequeue ()
#8  0x00000039d29794eb in qpid::broker::MessageStoreModule::dequeue ()
#9  0x00000039d2983db7 in qpid::broker::Queue::dequeue ()
#10 0x00000039d292ed34 in qpid::broker::DeliveryRecord::accept ()
#11 0x00000039d29c1853 in std::__find_if<std::_Deque_iterator<qpid::broker::DeliveryRecord, qpid::broker::DeliveryRecord&, qpid::broker::DeliveryRecord*>, qpid::broker::IsInSequenceSetAnd<boost::_bi::bind_t<bool, boost::_mfi::mf1<bool, qpid::broker::DeliveryRecord, qpid::broker::TransactionContext*>, boost::_bi::list2<boost::arg<1>, boost::_bi::value<qpid::broker::TransactionContext*> > > > > ()
#12 0x00000039d29c1ed9 in std::remove_if<std::_Deque_iterator<qpid::broker::DeliveryRecord, qpid::broker::DeliveryRecord&, qpid::broker::DeliveryRecord*>, qpid::broker::IsInSequenceSetAnd<boost::_bi::bind_t<bool, boost::_mfi::mf1<bool, qpid::broker::DeliveryRecord, qpid::broker::TransactionContext*>, boost::_bi::list2<boost::arg<1>, boost::_bi::value<qpid::broker::TransactionContext*> > > > > ()
#13 0x00000039d29b70e3 in qpid::broker::SemanticState::accepted ()
#14 0x00000039d23470c2 in qpid::framing::AMQP_ServerOperations::MessageHandler::Invoker::visit () from /usr/lib64/libqpidcommon.so.2
#15 0x00000039d234abd7 in qpid::framing::AMQP_ServerOperations::Invoker::visit
#16 0x00000039d29e16e3 in qpid::framing::invoke<qpid::broker::SessionAdapter>
#17 0x00000039d29dff7d in qpid::broker::SessionState::handleCommand ()
#18 0x00000039d29e0ef9 in qpid::broker::SessionState::handleIn ()
#19 0x00000039d23b9fa9 in qpid::amqp_0_10::SessionHandler::handleIn ()
#20 0x00000039d291dee2 in qpid::broker::Connection::received ()
#21 0x00000039d28fdd84 in qpid::amqp_0_10::Connection::decode ()
#22 0x00000039d23fde11 in qpid::sys::AsynchIOHandler::readbuff ()
#23 0x00000039d231de4f in boost::function2<void, qpid::sys::AsynchIO&, qpid::sys::AsynchIOBufferBase*, std::allocator<boost::function_base> >::operator() ()
#24 0x00000039d231c3b3 in qpid::sys::posix::AsynchIO::readable ()
#25 0x00000039d2404e97 in boost::function1<void, qpid::sys::DispatchHandle&, std::allocator<boost::function_base> >::operator() ()
#26 0x00000039d23ffd2f in qpid::sys::DispatchHandle::processEvent ()
#27 0x00000039d2329fff in qpid::sys::Poller::run ()
#28 0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#29 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#30 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 3 (Thread 0x43da7940 (LWP 6793)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa40b16b in pthread_cond_signal@@GLIBC_2.3.2 ()
#2  0x00000039d29581fd in qpid::broker::IncompleteMessageList::enqueueComplete
#3  0x00000039d29596df in boost::function1<void, boost::intrusive_ptr<qpid::broker::Message> const&, std::allocator<void> >::operator() ()
#4  0x00000039d2975425 in qpid::broker::Message::allEnqueuesComplete ()
#5  0x00000039d297c339 in qpid::broker::PersistableMessage::enqueueComplete ()
#6  0x00002b76116f3d86 in mrg::msgstore::JournalImpl::wr_aio_cb ()
#7  0x00002b76117664a7 in mrg::journal::wmgr::get_events ()
#8  0x00002b7611768d7f in mrg::journal::wmgr::write_flush ()
#9  0x00002b761176914d in mrg::journal::wmgr::flush_check ()
#10 0x00002b761176a921 in mrg::journal::wmgr::enqueue ()
#11 0x00002b76117453be in mrg::journal::jcntl::enqueue_data_record ()
#12 0x00002b76116fa283 in mrg::msgstore::JournalImpl::enqueue_data_record ()
#13 0x00002b76117051a7 in mrg::msgstore::MessageStoreImpl::store ()
#14 0x00002b761171301b in mrg::msgstore::MessageStoreImpl::enqueue ()
#15 0x00000039d29795cb in qpid::broker::MessageStoreModule::enqueue ()
#16 0x00000039d298860c in qpid::broker::Queue::enqueue ()
#17 0x00000039d2989dc6 in qpid::broker::Queue::deliver ()
#18 0x00000039d292c7e3 in qpid::broker::DeliverableMessage::deliverTo ()
#19 0x00000039d2944065 in qpid::broker::Exchange::doRoute ()
#20 0x00000039d2930ed3 in qpid::broker::DirectExchange::route ()
#21 0x00000039d29babf3 in qpid::broker::SemanticState::route ()
#22 0x00000039d29bbb4d in qpid::broker::SemanticState::handle ()
#23 0x00000039d29e090e in qpid::broker::SessionState::handleContent ()
#24 0x00000039d29e0eb0 in qpid::broker::SessionState::handleIn ()
#25 0x00000039d23b9fa9 in qpid::amqp_0_10::SessionHandler::handleIn ()
#26 0x00000039d291dee2 in qpid::broker::Connection::received ()
#27 0x00000039d28fdd84 in qpid::amqp_0_10::Connection::decode ()
#28 0x00000039d23fde11 in qpid::sys::AsynchIOHandler::readbuff ()
#29 0x00000039d231de4f in boost::function2<void, qpid::sys::AsynchIO&, qpid::sys::AsynchIOBufferBase*, std::allocator<boost::function_base> >::operator() ()
#30 0x00000039d231c3b3 in qpid::sys::posix::AsynchIO::readable ()
#31 0x00000039d2404e97 in boost::function1<void, qpid::sys::DispatchHandle&, std::allocator<boost::function_base> >::operator() ()
#32 0x00000039d23ffd2f in qpid::sys::DispatchHandle::processEvent ()
#33 0x00000039d2329fff in qpid::sys::Poller::run ()
#34 0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#35 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#36 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 2 (Thread 0x447a8940 (LWP 6794)):
#0  0x00000038fa40d2e4 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000038fa408c3a in _L_lock_1034 () from /lib64/libpthread.so.0
#2  0x00000038fa408afc in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00002b761173865a in mrg::journal::slock::slock ()
#4  0x00002b7611745052 in mrg::journal::jcntl::dequeue_data_record ()
#5  0x00002b76116f9973 in mrg::msgstore::JournalImpl::dequeue_data_record ()
#6  0x00002b76117047ea in mrg::msgstore::MessageStoreImpl::async_dequeue ()
#7  0x00002b761171461f in mrg::msgstore::MessageStoreImpl::dequeue ()
#8  0x00000039d29794eb in qpid::broker::MessageStoreModule::dequeue ()
#9  0x00000039d2983db7 in qpid::broker::Queue::dequeue ()
#10 0x00000039d292ed34 in qpid::broker::DeliveryRecord::accept ()
#11 0x00000039d29c1853 in std::__find_if<std::_Deque_iterator<qpid::broker::DeliveryRecord, qpid::broker::DeliveryRecord&, qpid::broker::DeliveryRecord*>, qpid::broker::IsInSequenceSetAnd<boost::_bi::bind_t<bool, boost::_mfi::mf1<bool, qpid::broker::DeliveryRecord, qpid::broker::TransactionContext*>, boost::_bi::list2<boost::arg<1>, boost::_bi::value<qpid::broker::TransactionContext*> > > > > ()
#12 0x00000039d29c1ed9 in std::remove_if<std::_Deque_iterator<qpid::broker::DeliveryRecord, qpid::broker::DeliveryRecord&, qpid::broker::DeliveryRecord*>, qpid::broker::IsInSequenceSetAnd<boost::_bi::bind_t<bool, boost::_mfi::mf1<bool, qpid::broker::DeliveryRecord, qpid::broker::TransactionContext*>, boost::_bi::list2<boost::arg<1>, boost::_bi::value<qpid::broker::TransactionContext*> > > > > ()
#13 0x00000039d29b70e3 in qpid::broker::SemanticState::accepted ()
#14 0x00000039d23470c2 in qpid::framing::AMQP_ServerOperations::MessageHandler::Invoker::visit () from /usr/lib64/libqpidcommon.so.2
#15 0x00000039d234abd7 in qpid::framing::AMQP_ServerOperations::Invoker::visit
#16 0x00000039d29e16e3 in qpid::framing::invoke<qpid::broker::SessionAdapter>
#17 0x00000039d29dff7d in qpid::broker::SessionState::handleCommand ()
#18 0x00000039d29e0ef9 in qpid::broker::SessionState::handleIn ()
#19 0x00000039d23b9fa9 in qpid::amqp_0_10::SessionHandler::handleIn ()
#20 0x00000039d291dee2 in qpid::broker::Connection::received ()
#21 0x00000039d28fdd84 in qpid::amqp_0_10::Connection::decode ()
#22 0x00000039d23fde11 in qpid::sys::AsynchIOHandler::readbuff ()
#23 0x00000039d231de4f in boost::function2<void, qpid::sys::AsynchIO&, qpid::sys::AsynchIOBufferBase*, std::allocator<boost::function_base> >::operator() ()
#24 0x00000039d231c3b3 in qpid::sys::posix::AsynchIO::readable ()
#25 0x00000039d2404e97 in boost::function1<void, qpid::sys::DispatchHandle&, std::allocator<boost::function_base> >::operator() ()
#26 0x00000039d23ffd2f in qpid::sys::DispatchHandle::processEvent ()
#27 0x00000039d2329fff in qpid::sys::Poller::run ()
#28 0x00000039d23201ca in ?? () from /usr/lib64/libqpidcommon.so.2
#29 0x00000038fa406617 in start_thread () from /lib64/libpthread.so.0
#30 0x00000038f9cd3c2d in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x2b760f13c830 (LWP 6788)):
#0  0x00000038f9cd4018 in epoll_wait () from /lib64/libc.so.6
#1  0x00000039d23295af in qpid::sys::Poller::wait ()
#2  0x00000039d2329fd2 in qpid::sys::Poller::run ()
#3  0x00000039d290a2f2 in qpid::broker::Broker::run ()
#4  0x0000000000406ae6 in ?? ()
#5  0x00000000004055af in __cxa_pure_virtual ()
#6  0x00000038f9c1d994 in __libc_start_main () from /lib64/libc.so.6
#7  0x0000000000405019 in __cxa_pure_virtual ()
#8  0x00007fffb4671038 in ?? ()
#9  0x0000000000000000 in ?? ()
[gordon@mrg15 ~]$
Comment 2 Kim van der Riet 2010-05-06 14:20:43 EDT
In both these cases, it seems that something is holding the lock in qpid::broker::IncompleteMessageList::enqueueComplete() which is blocking the thread. I cannot find another thread that is doing so, however.

In the first case, thread 3 is holding the store lock, but is blocked in the broker callback in IncompleteMessageList::enqueueComplete(). Threads 2 and 4 (which contians the flush call from the timer) are simply waiting for this thread to complete and release the store lock.

The second case is similar. Thread 3 is stuck in the broker callback (aparrently with no thread holding the lock), and threads 2, 4 and 6 (the timer flush call) are waiting for thread 3 to return.

I cannot see what is holding the lock in IncompleteMessageList::enqueueComplete() in either of these cases. None of the other threads have passed through the IncompleteMessageList class, and so cannot be holding the lock.
Comment 3 Gordon Sim 2010-05-17 03:42:37 EDT
I believe this may have been caused by the heap corruption fixed in r944329. Certainly I can't reproduce it now, so closing.

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