Program received signal SIGINT, Interrupt.
__lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#0  __lll_lock_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007ffff028b68d in _L_lock_1082 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007ffff028b607 in __GI___pthread_mutex_lock (mutex=0x1716610)
    at ../nptl/pthread_mutex_lock.c:134
#3  0x00007ffff44c3121 in g_mutex_lock ()
   from /opt/Ardour-4.2.64-dbg/lib/libglib-2.0.so.0
#4  0x00000000005d35ec in Glib::Threads::Mutex::Lock::Lock (
    this=0x7fffffffcd60, mutex=...)
    at /home/ardour/linux-x86_64/gtk/inst/include/glibmm-2.4/glibmm/threads.h:643
#5  0x00007ffff7944c8b in ArdourCanvas::WaveView::cancel_my_render_request (
    this=0x14d48bc0) at ../libs/canvas/wave_view.cc:1466
#6  0x00007ffff793e2fc in ArdourCanvas::WaveView::invalidate_image_cache (
    this=0x14d48bc0) at ../libs/canvas/wave_view.cc:265
#7  0x00007ffff793e08a in ArdourCanvas::WaveView::set_samples_per_pixel (
    this=0x14d48bc0, samples_per_pixel=8192) at ../libs/canvas/wave_view.cc:231
#8  0x0000000000a13eab in AudioGhostRegion::set_samples_per_pixel (
    this=0x14d460d0, fpp=8192) at ../gtk2_ardour/ghostregion.cc:119
#9  0x0000000000d627a9 in RegionView::set_samples_per_pixel (this=0x14d432c0,
    fpp=8192) at ../gtk2_ardour/region_view.cc:492
#10 0x00000000006b14f1 in AudioRegionView::set_samples_per_pixel (
    this=0x14d432c0, fpp=8192) at ../gtk2_ardour/audio_region_view.cc:963
#11 0x0000000000ec15c8 in StreamView::set_samples_per_pixel (this=0x8413e80,
    fpp=8192) at ../gtk2_ardour/streamview.cc:146
#12 0x0000000000d9adb2 in RouteTimeAxisView::set_samples_per_pixel (
    this=0x7eeb800, fpp=8192) at ../gtk2_ardour/route_time_axis.cc:1063
#13 0x0000000000d9aca8 in RouteTimeAxisView::reset_samples_per_pixel (
    this=0x7eeb800) at ../gtk2_ardour/route_time_axis.cc:1050
#14 0x0000000000db9179 in sigc::bound_mem_functor0<void, RouteTimeAxisView>::operator() (this=0x5c3a448)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#15 0x0000000000db6a24 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, RouteTimeAxisView> >::operator() (this=0x5c3a440)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#16 0x0000000000db3909 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, RouteTimeAxisView>, void>::call_it (rep=0x5c3a410)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#17 0x00000000005e17bb in sigc::internal::signal_emit0<void, sigc::nil>::emit (
    impl=0x8d12f20)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/signal.h:772
#18 0x00000000005e3efc in sigc::signal0<void, sigc::nil>::emit (this=0xad69888)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/signal.h:2669
#19 0x00000000005e309e in sigc::signal0<void, sigc::nil>::operator() (
    this=0xad69888)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/signal.h:2677
#20 0x0000000000774743 in Editor::set_samples_per_pixel (this=0xad69700,
    spp=8192) at ../gtk2_ardour/editor.cc:4541
#21 0x0000000000774964 in Editor::visual_changer (this=0xad69700, vc=...)
    at ../gtk2_ardour/editor.cc:4624
#22 0x0000000000774907 in Editor::idle_visual_changer (this=0xad69700)
    at ../gtk2_ardour/editor.cc:4611
#23 0x000000000077487c in Editor::_idle_visual_changer (arg=0xad69700)
    at ../gtk2_ardour/editor.cc:4588
#24 0x00007ffff4475c95 in g_main_context_dispatch ()
   from /opt/Ardour-4.2.64-dbg/lib/libglib-2.0.so.0
#25 0x00007ffff4477b08 in ?? ()
   from /opt/Ardour-4.2.64-dbg/lib/libglib-2.0.so.0
#26 0x00007ffff4477bb5 in g_main_loop_run ()
   from /opt/Ardour-4.2.64-dbg/lib/libglib-2.0.so.0
#27 0x00007ffff38de657 in gtk_main ()
   from /opt/Ardour-4.2.64-dbg/lib/libgtk-x11-2.0.so.0
#28 0x00007ffff75a4425 in Gtkmm2ext::UI::run (this=0x19b6810, old_receiver=...)
    at ../libs/gtkmm2ext/gtk_ui.cc:280
#29 0x0000000000a6b506 in main (argc=1, argv=0x7fffffffd6a8)
    at ../gtk2_ardour/main.cc:390
(gdb)