#0  0xf52bd97d in ?? ()
#1  0xf6ef19fc in ARDOUR::PortEngineSharedImpl::port_connect_add_remove_callback (this=0xe6120ee8) at ../libs/ardour/ardour/port_engine_shared.h:186
#2  0xf6eec2d4 in ARDOUR::BackendPort::~BackendPort (this=0xe669f270, __in_chrg=<optimized out>) at ../libs/ardour/port_engine_shared.cc:46
#3  0xef1a7c3a in ARDOUR::DummyPort::~DummyPort (this=0xe669f270, __in_chrg=<optimized out>) at ../libs/backends/dummy/dummy_audiobackend.cc:1117
#4  0xef1ab204 in ARDOUR::DummyMidiPort::~DummyMidiPort (this=0xe669f270, __in_chrg=<optimized out>) at ../libs/backends/dummy/dummy_audiobackend.cc:1663
#5  0xf6ef6a2a in boost::checked_delete<ARDOUR::BackendPort> (x=0xe669f270) at /home/ardour/linux-i386/gtk/inst/include/boost/core/checked_delete.hpp:34
#6  0xf6ef78ac in boost::detail::sp_counted_impl_p<ARDOUR::BackendPort>::dispose (this=0xe6ae2a98) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/sp_counted_impl.hpp:92
#7  0x080763e6 in boost::detail::sp_counted_base::release (this=0xe6ae2a98) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:147
#8  0x0807644a in boost::detail::shared_count::~shared_count (this=0xffd25f4c, __in_chrg=<optimized out>)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/shared_count.hpp:426
#9  0xf695203a in boost::shared_ptr<ARDOUR::ProtoPort>::~shared_ptr (this=0xffd25f48, __in_chrg=<optimized out>)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/shared_ptr.hpp:342
#10 0xf69540df in boost::shared_ptr<ARDOUR::ProtoPort>::reset (this=0xe6407f8c) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/shared_ptr.hpp:693
#11 0xf6ee4317 in ARDOUR::Port::drop (this=0xe6407f60) at ../libs/ardour/port.cc:153
#12 0xf6ee372f in ARDOUR::Port::~Port (this=0xe6407f60, __in_chrg=<optimized out>) at ../libs/ardour/port.cc:96
#13 0xf6defd4e in ARDOUR::MidiPort::~MidiPort (this=0xe6407f60, __in_chrg=<optimized out>) at ../libs/ardour/midi_port.cc:60
#14 0xf6950c7a in ARDOUR::AudioEngine::add_pending_port_deletion (this=0xe6461cc0, p=0xe6407f60) at ../libs/ardour/audioengine.cc:1684
#15 0xf6f03578 in PortDeleter::operator() (this=0xe6044698, p=0xe6407f60) at ../libs/ardour/port_manager.cc:387
#16 0xf6f073f6 in boost::detail::sp_counted_impl_pd<ARDOUR::MidiPort*, PortDeleter>::dispose (this=0xe6044688)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/sp_counted_impl.hpp:172
#17 0x080763e6 in boost::detail::sp_counted_base::release (this=0xe6044688) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:147
#18 0x0807644a in boost::detail::shared_count::~shared_count (this=0xffd261ac, __in_chrg=<optimized out>)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/shared_count.hpp:426
#19 0xf695141e in boost::shared_ptr<ARDOUR::Port>::~shared_ptr (this=0xffd261a8, __in_chrg=<optimized out>) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/shared_ptr.hpp:342
#20 0xf715b6cd in boost::shared_ptr<ARDOUR::Port>::reset (this=0xe62fa858) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/shared_ptr.hpp:693
#21 0xf715978f in ARDOUR::TransportMaster::unregister_port (this=0xe62fa740) at ../libs/ardour/transport_master.cc:458
#22 0xf7156c34 in ARDOUR::TransportMaster::~TransportMaster (this=0xe62fa740, __in_chrg=<optimized out>) at ../libs/ardour/transport_master.cc:89
#23 0xf6b4f763 in ARDOUR::TimecodeTransportMaster::~TimecodeTransportMaster (this=0xe62fa740, __in_chrg=<optimized out>) at ../libs/ardour/ardour/transport_master.h:483
#24 0xf6e40053 in ARDOUR::MTC_TransportMaster::~MTC_TransportMaster (this=0xe62fa740, __in_chrg=<optimized out>) at ../libs/ardour/mtc_slave.cc:76
#25 0xf715caf2 in boost::checked_delete<ARDOUR::MTC_TransportMaster> (x=0xe62fa740) at /home/ardour/linux-i386/gtk/inst/include/boost/core/checked_delete.hpp:34
#26 0xf715dffa in boost::detail::sp_counted_impl_p<ARDOUR::MTC_TransportMaster>::dispose (this=0xe65bab68)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/sp_counted_impl.hpp:92
#27 0x080763e6 in boost::detail::sp_counted_base::release (this=0xe65bab68) at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:147
#28 0x0807644a in boost::detail::shared_count::~shared_count (this=0xe65a8204, __in_chrg=<optimized out>)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/detail/shared_count.hpp:426
#29 0xf6951e40 in boost::shared_ptr<ARDOUR::TransportMaster>::~shared_ptr (this=0xe65a8200, __in_chrg=<optimized out>)
    at /home/ardour/linux-i386/gtk/inst/include/boost/smart_ptr/shared_ptr.hpp:342
#30 0xf71655cd in __gnu_cxx::new_allocator<boost::shared_ptr<ARDOUR::TransportMaster> >::destroy (this=0xffd263b7, __p=0xe65a8200) at /usr/include/c++/4.4/ext/new_allocator.h:115
#31 0xf7164b3e in std::_List_base<boost::shared_ptr<ARDOUR::TransportMaster>, std::allocator<boost::shared_ptr<ARDOUR::TransportMaster> > >::_M_clear (this=0xef000d38)
    at /usr/include/c++/4.4/bits/list.tcc:76
#32 0xf71646e3 in std::list<boost::shared_ptr<ARDOUR::TransportMaster>, std::allocator<boost::shared_ptr<ARDOUR::TransportMaster> > >::clear (this=0xef000d38)
    at /usr/include/c++/4.4/bits/stl_list.h:1132
#33 0xf716213f in ARDOUR::TransportMasterManager::clear (this=0xef000cc0) at ../libs/ardour/transport_master_manager.cc:581
#34 0xf715edc5 in ARDOUR::TransportMasterManager::set_default_configuration (this=0xef000cc0) at ../libs/ardour/transport_master_manager.cc:76
#35 0xf7162a40 in ARDOUR::TransportMasterManager::restart (this=0xef000cc0) at ../libs/ardour/transport_master_manager.cc:712
#36 0xf6ada5e4 in ARDOUR::init_post_engine (start_cnt=0) at ../libs/ardour/globals.cc:643
#37 0xf694e36e in ARDOUR::AudioEngine::start (this=0xe6461cc0, for_latency=false) at ../libs/ardour/audioengine.cc:1027