#0  0xb727445c in Evoral::ControlList::rt_safe_earliest_event_discrete_unlocked (this=0xb04ca1c, 
    start=0, x=@0xbfffe7b0, y=@0xbfffe7a8, inclusive=false)
    at ../libs/evoral/src/ControlList.cpp:1484
#1  0xb72953b7 in Evoral::Sequence<double>::const_iterator::operator++() ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libevoral.so.0
#2  0xb7ae5765 in ARDOUR::MidiModel::sync_to_source (this=0xa1b0568)
    at ../libs/ardour/midi_model.cc:1398
#3  0xb7b1163e in ARDOUR::MidiSource::session_saved (this=0xa195e20)
    at ../libs/ardour/midi_source.cc:404
#4  0xb7cbe8e6 in ARDOUR::Session::save_state (this=0x9bb0ba0, snapshot_name=..., pending=true, 
    switch_to_snapshot=false) at ../libs/ardour/session_state.cc:767
#5  0xb7cbd830 in ARDOUR::Session::maybe_write_autosave (this=0x9bb0ba0)
    at ../libs/ardour/session_state.cc:620
#6  0x087e74ff in ARDOUR_UI::autosave_session (this=0x93346a0) at ../gtk2_ardour/ardour_ui.cc:606
#7  0x08810528 in sigc::bound_mem_functor0<int, ARDOUR_UI>::operator() (this=0xac4b30c)
    at /home/harrison/a3/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#8  0x0880cc60 in sigc::adaptor_functor<sigc::bound_mem_functor0<int, ARDOUR_UI> >::operator() (
    this=0xac4b308) at /home/harrison/a3/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#9  0x08808184 in sigc::internal::slot_call0<sigc::bound_mem_functor0<int, ARDOUR_UI>, bool>::call_it
    (rep=0xac4b2f0) at /home/harrison/a3/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#10 0x087b7dee in sigc::slot0<bool>::operator() (this=0xaceffc8)
    at /home/harrison/a3/inst/include/sigc++-2.0/sigc++/functors/slot.h:440
#11 0xb6d39e0a in ?? ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libglibmm-2.4.so.1
#12 0xb6baf944 in ?? ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libglib-2.0.so.0
#13 0xb6badbf3 in ?? ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libglib-2.0.so.0
#14 0xb6bae79f in g_main_context_dispatch ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libglib-2.0.so.0
#15 0xb6bae98a in ?? ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libglib-2.0.so.0
#16 0xb6baee04 in g_main_loop_run ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libglib-2.0.so.0
#17 0xb682c95e in gtk_main ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libgtk-x11-2.0.so.0
#18 0xb5fb1d47 in Gtk::Main::run_impl() ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libgtkmm-2.4.so.1
#19 0xb5fb1af8 in Gtk::Main::run() ()
   from /tmp/cinstall-1000/ardour-3.0beta5_13072-2-i686/opt/Ardour_x86-3.0beta5_13072/lib/libgtkmm-2.4.so.1
#20 0xb7146c7f in Gtkmm2ext::UI::run (this=0x93346a0, old_receiver=...)
    at ../libs/gtkmm2ext/gtk_ui.cc:268
#21 0x08b59865 in main (argc=1, argv=0xbfffee94) at ../gtk2_ardour/main.cc:455