(gdb) run
Starting program: /usr/local/src/ardour3/build/gtk2_ardour/ardour-3.0 
[Thread debugging using libthread_db enabled]
Ardour3.0alpha10 (built using ['10469'] and GCC version 4.6.1)
Copyright (C) 1999-2011 Paul Davis
Some portions Copyright (C) Steve Harris, Ari Johnson, Brett Viren, Joel Baker

Ardour comes with ABSOLUTELY NO WARRANTY
not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
This is free software, and you are welcome to redistribute it 
under certain conditions; see the source for copying conditions.
Cannot xinstall SIGPIPE error handler
ardour: [INFO]: Loading default ui configuration file gtk2_ardour/../gtk2_ardour/ardour3_ui_default.conf
Loading ui configuration file gtk2_ardour/../build/gtk2_ardour/ardour3_ui_dark.rc
ardour: [INFO]: Ardour will be limited to 4096 open files
[New Thread 0x7fffe46f8700 (LWP 20077)]
ardour: [INFO]: Loading system configuration file /usr/local/etc/ardour3/ardour_system.rc
Loading user configuration file /home/acolomb/.config/ardour3/ardour.rc
Using SSE optimized routines
[New Thread 0x7fffe3ef7700 (LWP 20078)]
[New Thread 0x7fffe36f6700 (LWP 20079)]
[New Thread 0x7fffe2ef5700 (LWP 20081)]
ardour: [INFO]: looking for panners in gtk2_ardour/../build/libs/panners/2in2out:gtk2_ardour/../build/libs/panners/1in2out:gtk2_ardour/../build/libs/panners/vbap
ardour: [INFO]: Panner discovered: "Equal Power Stereo"
ardour: [INFO]: Panner discovered: "Mono to Stereo Panner"
ardour: [INFO]: Panner discovered: "VBAP 2D panner"
[New Thread 0x7fffe0eaf700 (LWP 20097)]
[New Thread 0x7fffd65c8700 (LWP 20098)]
[New Thread 0x7fffd5dc7700 (LWP 20099)]
[New Thread 0x7fffd55c6700 (LWP 20100)]
[New Thread 0x7fffd4dc5700 (LWP 20101)]
[New Thread 0x7fffe06ae700 (LWP 20102)]
[New Thread 0x7fffe062d700 (LWP 20103)]
[Thread 0x7fffe062d700 (LWP 20103) exited]
[Thread 0x7fffe06ae700 (LWP 20102) exited]
[Thread 0x7fffd4dc5700 (LWP 20101) exited]
[Thread 0x7fffd5dc7700 (LWP 20099) exited]
[Thread 0x7fffd65c8700 (LWP 20098) exited]
[Thread 0x7fffe0eaf700 (LWP 20097) exited]
[Thread 0x7fffd55c6700 (LWP 20100) exited]
[New Thread 0x7fffd55c6700 (LWP 20464)]
Checking into 32 Tracks.template using .template
Checking into 2 Track.template using .template
Checking into 8 Tracks.template using .template
Checking into 4 Tracks.template using .template
Checking into 16 Tracks.template using .template
Found 5 along /usr/local/share/ardour3/templates:/home/acolomb/.config/ardour3/templates
[New Thread 0x7fffe0eaf700 (LWP 20465)]
Grab new name focus
lost focus
[Thread 0x7fffe0eaf700 (LWP 20465) exited]
[New Thread 0x7fffe06ae700 (LWP 20553)]
[New Thread 0x7fffe062d700 (LWP 20554)]
LV2: Discovering 186 plugins
Done LV2 discovery
[Thread 0x7fffd55c6700 (LWP 20464) exited]
[New Thread 0x7fffe0087700 (LWP 20952)]
[New Thread 0x7fffd4688700 (LWP 20953)]
[New Thread 0x7fffb9306700 (LWP 20954)]
[New Thread 0x7fffb9285700 (LWP 20955)]
[New Thread 0x7fffb9203820 (LWP 20970)]
[New Thread 0x7fffd55c6700 (LWP 20971)]
[New Thread 0x7fffb9188820 (LWP 20972)]
[New Thread 0x7fffe0eaf700 (LWP 20973)]
[New Thread 0x7fffd65c8700 (LWP 20974)]
[Thread 0x7fffe0eaf700 (LWP 20973) exited]
[Thread 0x7fffd65c8700 (LWP 20974) exited]
ardour-3.0: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = ARDOUR::Speakers]: Assertion `px != 0' failed.

Program received signal SIGABRT, Aborted.
0x00007fffebe8e405 in *__GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64	../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
	in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) thread apply all bt

Thread 23 (Thread 0x7fffb9188820 (LWP 20972)):
#0  0x00007fffec1ee89d in nanosleep () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007ffff2bf0da2 in g_usleep () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff6ddbf76 in ARDOUR::AudioEngine::meter_thread (this=0x2afd020) at ../libs/ardour/audioengine.cc:692
#3  0x00007ffff6dfb610 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator() (this=0x6c593f0, p=0x2afd020) at /usr/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007ffff6df6c60 in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0> (this=0x6c59400, f=..., a=...) at /usr/include/boost/bind/bind.hpp:253
#5  0x00007ffff6df27ef in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator() (this=0x6c593f0) at /usr/include/boost/bind/bind_template.hpp:20
#6  0x00007ffff6dedbcc in sigc::adaptor_functor<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > > >::operator() (this=0x6c593f0)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#7  0x00007ffff6de9526 in sigc::internal::slot_call0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >, void>::call_it (rep=0x6c593c0)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff371c94d in operator() (this=0x6c5fb30) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:440
#9  (anonymous namespace)::call_thread_entry_slot (data=0x6c5fb30) at thread.cc:44
#10 0x00007ffff2bed986 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#12 0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 22 (Thread 0x7fffd55c6700 (LWP 20971)):
#0  0x00007fffebf26723 in *__GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffff2bc86b8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff2bc8ee2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4cc413f in BaseUI::main_thread (this=0x2a2a0c0) at ../libs/pbd/base_ui.cc:77
#4  0x00007ffff4cc54e9 in sigc::bound_mem_functor0<void, BaseUI>::operator() (this=0x3fc81a8) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#5  0x00007ffff4cc534e in sigc::adaptor_functor<sigc::bound_mem_functor0<void, BaseUI> >::operator() (this=0x3fc81a0) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#6  0x00007ffff4cc50bf in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, BaseUI>, void>::call_it (rep=0x3fc8170) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff371c94d in operator() (this=0x2a2a1d0) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:440
#8  (anonymous namespace)::call_thread_entry_slot (data=0x2a2a1d0) at thread.cc:44
#9  0x00007ffff2bed986 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#11 0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 21 (Thread 0x7fffb9203820 (LWP 20970)):
#0  0x00007fffebf26723 in *__GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffff6e5921f in ARDOUR::Butler::thread_work (this=0x3f1a3d0) at ../libs/ardour/butler.cc:153
#2  0x00007ffff6e59179 in ARDOUR::Butler::_thread_work (arg=0x3f1a3d0) at ../libs/ardour/butler.cc:137
#3  0x00007ffff4cf9f0c in fake_thread_start (arg=0x3fb5be0) at ../libs/pbd/pthread_utils.cc:81
#4  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#5  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 20 (Thread 0x7fffb9285700 (LWP 20955)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:86
#1  0x00007ffff6f390ec in PBD::ProcessSemaphore::wait (this=0x3f1ba48) at /usr/local/src/ardour3/libs/pbd/pbd/semutils.h:41
#2  0x00007ffff6f375ca in ARDOUR::Graph::run_one (this=0x3f1b980) at ../libs/ardour/graph.cc:433
#3  0x00007ffff6f37996 in ARDOUR::Graph::helper_thread (this=0x3f1b980) at ../libs/ardour/graph.cc:483
#4  0x00007ffff6f3d196 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffb9284c08, p=0x3f1b980) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007ffff6f3cba2 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (this=0x7fffb9284c18, f=..., a=...) at /usr/include/boost/bind/bind.hpp:253
#6  0x00007ffff6f3c78d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (this=0x7fffb9284c08) at /usr/include/boost/bind/bind_template.hpp:20
#7  0x00007ffff6f3c2fd in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...)
    at /usr/include/boost/function/function_template.hpp:153
#8  0x00000000013a540c in boost::function0<void>::operator() (this=0x7fffb9284c00) at /usr/include/boost/function/function_template.hpp:1013
#9  0x00007ffff6dded01 in ARDOUR::AudioEngine::_start_process_thread (arg=0x3f2be10) at ../libs/ardour/audioengine.cc:1476
#10 0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#11 0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 19 (Thread 0x7fffb9306700 (LWP 20954)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:86
#1  0x00007ffff6f390ec in PBD::ProcessSemaphore::wait (this=0x3f1ba48) at /usr/local/src/ardour3/libs/pbd/pbd/semutils.h:41
#2  0x00007ffff6f375ca in ARDOUR::Graph::run_one (this=0x3f1b980) at ../libs/ardour/graph.cc:433
#3  0x00007ffff6f37996 in ARDOUR::Graph::helper_thread (this=0x3f1b980) at ../libs/ardour/graph.cc:483
---Type <return> to continue, or q <return> to quit---
#4  0x00007ffff6f3d196 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffb9305c08, p=0x3f1b980) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007ffff6f3cba2 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (this=0x7fffb9305c18, f=..., a=...) at /usr/include/boost/bind/bind.hpp:253
#6  0x00007ffff6f3c78d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (this=0x7fffb9305c08) at /usr/include/boost/bind/bind_template.hpp:20
#7  0x00007ffff6f3c2fd in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...)
    at /usr/include/boost/function/function_template.hpp:153
#8  0x00000000013a540c in boost::function0<void>::operator() (this=0x7fffb9305c00) at /usr/include/boost/function/function_template.hpp:1013
#9  0x00007ffff6dded01 in ARDOUR::AudioEngine::_start_process_thread (arg=0x3f2be10) at ../libs/ardour/audioengine.cc:1476
#10 0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#11 0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 18 (Thread 0x7fffd4688700 (LWP 20953)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:86
#1  0x00007ffff6f390ec in PBD::ProcessSemaphore::wait (this=0x3f1ba68) at /usr/local/src/ardour3/libs/pbd/pbd/semutils.h:41
#2  0x00007ffff6f367df in ARDOUR::Graph::restart_cycle (this=0x3f1b980) at ../libs/ardour/graph.cc:263
#3  0x00007ffff6f367a9 in ARDOUR::Graph::dec_ref (this=0x3f1b980) at ../libs/ardour/graph.cc:250
#4  0x00007ffff6f3d836 in ARDOUR::GraphNode::finish (this=0x3fc8520, chain=1) at ../libs/ardour/graphnode.cc:71
#5  0x00007ffff6f37735 in ARDOUR::Graph::run_one (this=0x3f1b980) at ../libs/ardour/graph.cc:447
#6  0x00007ffff6f37bc8 in ARDOUR::Graph::main_thread (this=0x3f1b980) at ../libs/ardour/graph.cc:522
#7  0x00007ffff6f3d196 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffd4687c08, p=0x3f1b980) at /usr/include/boost/bind/mem_fn_template.hpp:49
#8  0x00007ffff6f3cba2 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (this=0x7fffd4687c18, f=..., a=...) at /usr/include/boost/bind/bind.hpp:253
#9  0x00007ffff6f3c78d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (this=0x7fffd4687c08) at /usr/include/boost/bind/bind_template.hpp:20
#10 0x00007ffff6f3c2fd in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...)
    at /usr/include/boost/function/function_template.hpp:153
#11 0x00000000013a540c in boost::function0<void>::operator() (this=0x7fffd4687c00) at /usr/include/boost/function/function_template.hpp:1013
#12 0x00007ffff6dded01 in ARDOUR::AudioEngine::_start_process_thread (arg=0x3f2be10) at ../libs/ardour/audioengine.cc:1476
#13 0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#14 0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#15 0x0000000000000000 in ?? ()

Thread 17 (Thread 0x7fffe0087700 (LWP 20952)):
#0  sem_timedwait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S:106
#1  0x00007fffee097180 in ?? () from /usr/lib/libjack.so.0
#2  0x00007fffee08614a in ?? () from /usr/lib/libjack.so.0
#3  0x00007fffee0849d7 in ?? () from /usr/lib/libjack.so.0
#4  0x00007ffff6ddb190 in ARDOUR::AudioEngine::process_thread (this=0x2afd020) at ../libs/ardour/audioengine.cc:441
#5  0x00007ffff6ddaba4 in ARDOUR::AudioEngine::_process_thread (arg=0x2afd020) at ../libs/ardour/audioengine.cc:352
#6  0x00007fffee082b88 in ?? () from /usr/lib/libjack.so.0
#7  0x00007fffee0967a0 in ?? () from /usr/lib/libjack.so.0
#8  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#9  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 16 (Thread 0x7fffe062d700 (LWP 20554)):
#0  0x00007fffec1ee17d in read () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007fffee09842a in ?? () from /usr/lib/libjack.so.0
#2  0x00007fffee09acf7 in ?? () from /usr/lib/libjack.so.0
#3  0x00007fffee0967a0 in ?? () from /usr/lib/libjack.so.0
#4  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#5  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 15 (Thread 0x7fffe06ae700 (LWP 20553)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fffee097f21 in ?? () from /usr/lib/libjack.so.0
#2  0x00007fffee0935f5 in ?? () from /usr/lib/libjack.so.0
#3  0x00007fffee0967a0 in ?? () from /usr/lib/libjack.so.0
#4  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#5  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fffe2ef5700 (LWP 20081)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007ffff6d6cf91 in ARDOUR::Analyser::work () at ../libs/ardour/analyser.cc:85
---Type <return> to continue, or q <return> to quit---
#2  0x00007ffff6d6cd29 in analyser_work () at ../libs/ardour/analyser.cc:49
#3  0x0000000001947699 in sigc::pointer_functor0<void>::operator() (this=0x283f5b8) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x000000000194505a in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x283f5b0) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#5  0x0000000001942221 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x283f580) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff371c94d in operator() (this=0x2811850) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:440
#7  (anonymous namespace)::call_thread_entry_slot (data=0x2811850) at thread.cc:44
#8  0x00007ffff2bed986 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#10 0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fffe36f6700 (LWP 20079)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007ffff7216059 in peak_thread_work () at ../libs/ardour/source_factory.cc:68
#2  0x0000000001947699 in sigc::pointer_functor0<void>::operator() (this=0x283f818) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#3  0x000000000194505a in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x283f810) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#4  0x0000000001942221 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x283f7e0) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#5  0x00007ffff371c94d in operator() (this=0x2811e40) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:440
#6  (anonymous namespace)::call_thread_entry_slot (data=0x2811e40) at thread.cc:44
#7  0x00007ffff2bed986 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#9  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fffe3ef7700 (LWP 20078)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007ffff7216059 in peak_thread_work () at ../libs/ardour/source_factory.cc:68
#2  0x0000000001947699 in sigc::pointer_functor0<void>::operator() (this=0x283fc78) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#3  0x000000000194505a in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x283fc70) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#4  0x0000000001942221 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x283fc40) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#5  0x00007ffff371c94d in operator() (this=0x2810d10) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:440
#6  (anonymous namespace)::call_thread_entry_slot (data=0x2810d10) at thread.cc:44
#7  0x00007ffff2bed986 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#9  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fffe46f8700 (LWP 20077)):
#0  0x00007fffebf021cd in nanosleep () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007fffebf2b584 in usleep (useconds=<optimized out>) at ../sysdeps/unix/sysv/linux/usleep.c:33
#2  0x00007ffff72503c3 in gui_event_loop (ptr=0x0) at ../libs/ardour/vstfxwin.cc:382
#3  0x00007fffec1e6b40 in start_thread (arg=<optimized out>) at pthread_create.c:304
#4  0x00007fffebf3136d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff7f9c9a0 (LWP 19696)):
#0  0x00007fffebe8e405 in *__GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007fffebe91680 in *__GI_abort () at abort.c:92
#2  0x00007fffebe875b1 in *__GI___assert_fail (assertion=0x1e0b70c "px != 0", file=<optimized out>, line=418, function=0x1e0e7a0 "T* boost::shared_ptr<T>::operator->() const [with T = ARDOUR::Speakers]") at assert.c:81
#3  0x00000000018a4bd7 in boost::shared_ptr<ARDOUR::Speakers>::operator-> (this=0x7fffffffc2c0) at /usr/include/boost/smart_ptr/shared_ptr.hpp:418
#4  0x00000000018a1502 in Panner2d::handle_position_change (this=0x6fca840) at ../gtk2_ardour/panner2d.cc:262
#5  0x00000000018a6a50 in boost::_mfi::mf0<void, Panner2d>::operator() (this=0x6f06898, p=0x6fca840) at /usr/include/boost/bind/mem_fn_template.hpp:49
#6  0x00000000018a66b6 in boost::_bi::list1<boost::_bi::value<Panner2d*> >::operator()<boost::_mfi::mf0<void, Panner2d>, boost::_bi::list0> (this=0x6f068a8, f=..., a=...) at /usr/include/boost/bind/bind.hpp:253
#7  0x00000000018a637d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, Panner2d>, boost::_bi::list1<boost::_bi::value<Panner2d*> > >::operator() (this=0x6f06898) at /usr/include/boost/bind/bind_template.hpp:20
#8  0x00000000018a5f7b in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, Panner2d>, boost::_bi::list1<boost::_bi::value<Panner2d*> > >, void>::invoke (function_obj_ptr=...)
    at /usr/include/boost/function/function_template.hpp:153
#9  0x00000000013a540c in boost::function0<void>::operator() (this=0x6f06890) at /usr/include/boost/function/function_template.hpp:1013
#10 0x00007ffff51691c6 in AbstractUI<Gtkmm2ext::UIRequest>::call_slot(PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&) (this=0x2603c40, invalidation=0x6eedf40, f=...)
    at /usr/local/src/ardour3/libs/pbd/pbd/abstract_ui.cc:220
#11 0x0000000001351799 in boost::_mfi::mf2<void, PBD::EventLoop, PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&>::operator()(PBD::EventLoop*, PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&) const (this=0x6f06870, p=0x2603c40, a1=0x6eedf40, a2=...) at /usr/include/boost/bind/mem_fn_template.hpp:280
#12 0x000000000135125a in boost::_bi::list3<boost::_bi::value<PBD::EventLoop*>, boost::_bi::value<PBD::EventLoop::InvalidationRecord*>, boost::_bi::value<boost::function<void ()> > >::operator()<boost::_mfi::mf2<void, PBD::EventLoop, PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf2<void, PBD::EventLoop, PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&>&, boost::_bi::list0&, int) (this=0x6f06880, f=..., a=...) at /usr/include/boost/bind/bind.hpp:392
---Type <return> to continue, or q <return> to quit---
#13 0x0000000001350893 in boost::_bi::bind_t<void, boost::_mfi::mf2<void, PBD::EventLoop, PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&>, boost::_bi::list3<boost::_bi::value<PBD::EventLoop*>, boost::_bi::value<PBD::EventLoop::InvalidationRecord*>, boost::_bi::value<boost::function<void ()> > > >::operator()() (this=0x6f06870) at /usr/include/boost/bind/bind_template.hpp:20
#14 0x000000000134f428 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf2<void, PBD::EventLoop, PBD::EventLoop::InvalidationRecord*, boost::function<void ()> const&>, boost::_bi::list3<boost::_bi::value<PBD::EventLoop*>, boost::_bi::value<PBD::EventLoop::InvalidationRecord*>, boost::_bi::value<boost::function<void ()> > > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...)
    at /usr/include/boost/function/function_template.hpp:153
#15 0x00000000013a540c in boost::function0<void>::operator() (this=0x6c5d1e8) at /usr/include/boost/function/function_template.hpp:1013
#16 0x00000000013a075b in boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker::m_invoke(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > const&, boost::signals2::detail::void_type const*) const (this=0x7fffffffc8b0, connectionBody=...) at /usr/include/boost/signals2/detail/signal_template.hpp:360
#17 0x000000000139a64c in boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker::operator()(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > const&) const (this=0x7fffffffc8b0, connectionBody=...) at /usr/include/boost/signals2/detail/signal_template.hpp:345
#18 0x0000000001393c51 in boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> >::dereference() const (this=0x7fffffffc6f0) at /usr/include/boost/signals2/detail/slot_call_iterator.hpp:82
#19 0x000000000138d3b4 in boost::iterator_core_access::dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > const&) (f=...) at /usr/include/boost/iterator/iterator_facade.hpp:517
#20 0x0000000001387544 in boost::iterator_facade<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> >, boost::signals2::detail::void_type, boost::single_pass_traversal_tag, boost::signals2::detail::void_type const&, long>::operator*() const (this=0x7fffffffc6f0)
    at /usr/include/boost/iterator/iterator_facade.hpp:643
#21 0x0000000001382db5 in boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> >, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> >) const (this=0x6c46340, first=..., last=...) at /usr/include/boost/signals2/optional_last_value.hpp:55
#22 0x000000000137d6e9 in boost::signals2::detail::combiner_invoker<void>::operator()<boost::signals2::optional_last_value<void>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >(boost::signals2::optional_last_value<void>&, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> >, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()> >, boost::signals2::mutex> >) const (
    this=0x7fffffffc95f, combiner=..., first=..., last=...) at /usr/include/boost/signals2/detail/result_type_wrapper.hpp:64
#23 0x0000000001378c28 in boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::operator()() (this=0x6c46250) at /usr/include/boost/signals2/detail/signal_template.hpp:246
#24 0x00000000013738a0 in boost::signals2::signal0<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()>, boost::function<void (boost::signals2::connection const&)>, boost::signals2::mutex>::operator()() (this=0x6c44c68) at /usr/include/boost/signals2/detail/signal_template.hpp:692
#25 0x000000000136fad8 in PBD::Signal0<void>::operator() (this=0x6c44c68) at /usr/local/src/ardour3/libs/pbd/pbd/signals.h:110
#26 0x00007ffff6e3b18e in ARDOUR::AutomationControl::set_value (this=0x6c44b90, value=0.5) at ../libs/ardour/automation_control.cc:71
#27 0x00007ffff701eef5 in ARDOUR::PanControllable::set_value (this=0x6c44b90, v=0.5) at ../libs/ardour/pan_controllable.cc:65
#28 0x00007fffe24d707f in ARDOUR::Panner2in2out::set_position (this=0x6fd0a30, p=0.5) at ../libs/panners/2in2out/panner_2in2out.cc:114
#29 0x00007fffe24d8725 in ARDOUR::Panner2in2out::reset (this=0x6fd0a30) at ../libs/panners/2in2out/panner_2in2out.cc:497
#30 0x0000000001ace108 in StereoPanner::on_button_release_event (this=0x6f21910, ev=0x6e62b50) at ../gtk2_ardour/stereo_panner.cc:435
#31 0x00007ffff005eef3 in Gtk::Widget_Class::button_release_event_callback (self=0x6e61570, p0=0x6e62b50) at widget.cc:4673
#32 0x00007ffff267d1a8 in _gtk_marshal_BOOLEAN__BOXED (closure=0x2672a60, return_value=0x7fffffffcc80, n_param_values=<optimized out>, param_values=0x6f17500, invocation_hint=<optimized out>, marshal_data=<optimized out>)
    at /build/buildd-gtk+2.0_2.24.7-1-amd64-huURlY/gtk+2.0-2.24.7/gtk/gtkmarshalers.c:86
#33 0x00007ffff349a804 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#34 0x00007ffff34ac5bf in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#35 0x00007ffff34b5be3 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#36 0x00007ffff34b5fb2 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#37 0x00007ffff2796051 in gtk_widget_event_internal (widget=0x6e61570, event=0x6e62b50) at /build/buildd-gtk+2.0_2.24.7-1-amd64-huURlY/gtk+2.0-2.24.7/gtk/gtkwidget.c:4984
#38 0x00007ffff267b363 in IA__gtk_propagate_event (widget=0x6e61570, event=0x6e62b50) at /build/buildd-gtk+2.0_2.24.7-1-amd64-huURlY/gtk+2.0-2.24.7/gtk/gtkmain.c:2489
#39 0x00007ffff267b6c3 in IA__gtk_main_do_event (event=0x6e62b50) at /build/buildd-gtk+2.0_2.24.7-1-amd64-huURlY/gtk+2.0-2.24.7/gtk/gtkmain.c:1684
#40 0x00007ffff22e71dc in gdk_event_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at /build/buildd-gtk+2.0_2.24.7-1-amd64-huURlY/gtk+2.0-2.24.7/gdk/x11/gdkevents-x11.c:2377
#41 0x00007ffff2bc81ad in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007ffff2bc89a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007ffff2bc8ee2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007ffff267a717 in IA__gtk_main () at /build/buildd-gtk+2.0_2.24.7-1-amd64-huURlY/gtk+2.0-2.24.7/gtk/gtkmain.c:1256
#45 0x00007ffff515b978 in Gtkmm2ext::UI::run (this=0x2603c20, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:268
#46 0x00000000017a3e7f in main (argc=1, argv=0x7fffffffd398) at ../gtk2_ardour/main.cc:557
(gdb)