synfigstudio: /home/pabs/opt/include/ETL/_handle.h:82: void etl::shared_object::ref() const: Assertion `refcount>=0' failed.
synfigstudio: /home/pabs/opt/include/ETL/_handle.h:82: void etl::shared_object::ref() const: Assertion `refcount>=0' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb550db90 (LWP 18682)]
0xffffe410 in __kernel_vsyscall ()
(gdb) bt
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb6cdbef5 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb6cdd871 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb6cd50ee in __assert_fail () from /lib/i686/cmov/libc.so.6
#4  0xb7d350fa in synfig::optimize_layers (time={value_ = 0}, context=
        {<std::_Deque_iterator<etl::handle<synfig::Layer>,const etl::handle<synfig::Layer>&,const etl::handle<synfig::Layer>*>> = {_M_cur = 0x8f2d570, _M_first = 0x8f2d4d8, _M_last = 0x8f2d6d8, _M_node = 0x8d884e0}, <No data fields>}, op_canvas=@0xb550d2b8, seen_motion_blur_in_parent=false) at /home/pabs/opt/include/ETL/_handle.h:82
#5  0xb7c7c9b5 in synfig::Target_Scanline::render (this=0x8fc7700, cb=0x0) at ../../../../git/synfig/src/synfig/target_scanline.cpp:313
#6  0x081e9fb4 in studio::AsyncRenderer::render_target (this=0x9147278) at ../../../../git/synfigstudio/src/gtkmm/asyncrenderer.cpp:496
#7  0xb71bae15 in ?? () from /usr/lib/libglibmm-2.4.so.1
#8  0xb6f6e94f in g_thread_create_proxy (data=0x9146800) at /tmp/buildd/glib2.0-2.14.6/glib/gthread.c:635
#9  0xb79544fb in start_thread () from /lib/i686/cmov/libpthread.so.0
#10 0xb6d879ae in clone () from /lib/i686/cmov/libc.so.6
(gdb) bt full
#0  0xffffe410 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb6cdbef5 in raise () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#2  0xb6cdd871 in abort () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#3  0xb6cd50ee in __assert_fail () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#4  0xb7d350fa in synfig::optimize_layers (time={value_ = 0}, context=
        {<std::_Deque_iterator<etl::handle<synfig::Layer>,const etl::handle<synfig::Layer>&,const etl::handle<synfig::Layer>*>> = {_M_cur = 0x8f2d570, _M_first = 0x8f2d4d8, _M_last = 0x8f2d6d8, _M_node = 0x8d884e0}, <No data fields>}, op_canvas=@0xb550d2b8, seen_motion_blur_in_parent=false) at /home/pabs/opt/include/ETL/_handle.h:82
	sub_canvas = {obj = 0xb4300468}
	z_depth = 67
	value = {type = synfig::ValueBase::TYPE_NIL, data = 0x0, ref_count = {counter_ = 0x0}, loop_ = false}
	sort_list = {<std::_Vector_base<std::pair<float, etl::handle<synfig::Layer> >,std::allocator<std::pair<float, etl::handle<synfig::Layer> > > >> = {
    _M_impl = {<std::allocator<std::pair<float, etl::handle<synfig::Layer> > >> = {<__gnu_cxx::new_allocator<std::pair<float, etl::handle<synfig::Layer> > >> = {<No data fields>}, <No data fields>}, _M_start = 0x914d1a8, _M_finish = 0x914d3c8, _M_end_of_storage = 0x914d5a8}}, <No data fields>}
	i = 67
	motion_blur_i = 0
	motion_blur_z_depth = 0
	seen_motion_blur_locally = false
	motion_blurred = 208
#5  0xb7c7c9b5 in synfig::Target_Scanline::render (this=0x8fc7700, cb=0x0) at ../../../../git/synfig/src/synfig/target_scanline.cpp:313
	colordata = <value optimized out>
	y = <value optimized out>
	blockrd = {w_ = 0, h_ = 149787352, x_res = -7.0240869801987807e-52, y_res = -7.0236790819802683e-52, tl_ = {_x = 6.3659873847533924e-314, _y = 1.4935853838593652e-314}, 
  br_ = {_x = -2.8318066119709361e-43, _y = 0}, focus = {_x = 3.9175116871852111e-265, _y = -7.0240824284629737e-52}, a = -1230537784, background = {a_ = -7.77915602e-07, 
    r_ = -2.96610397e-05, g_ = 5.60519386e-44, b_ = 0}, flags = -1271920856, interlaced = false, clamp = false, frame_rate = -6.25243456e-06, time_begin = {
    value_ = -2.2157911246527051e-44}, time_end = {value_ = -1.2469377494699205e-44}, AntialiasFilter = 3041972680}
	sc = {<synfig::ProgressCallback> = {_vptr.ProgressCallback = 0xb550d1f8}, cb = 0x18, start = 16, end = -1271922624, tot = 0, w = 152495800}
	i = <value optimized out>
	surface = {<etl::surface<synfig::Color,synfig::Color,synfig::ColorPrep>> = {data_ = 0xb6d1eb1d, zero_pos_ = 0xb6dfb140, pitch_ = -1227764735, w_ = -1227767215, h_ = 16, 
    deletable_ = 208, cooker_ = {<No data fields>}}, <No data fields>}
	totalheight = <value optimized out>
	rowheight = <value optimized out>
	lastrowheight = <value optimized out>
	context = {<std::_Deque_iterator<etl::handle<synfig::Layer>,const etl::handle<synfig::Layer>&,const etl::handle<synfig::Layer>*>> = {_M_cur = 0x0, _M_first = 0x0, 
    _M_last = 0x0, _M_node = 0x0}, <No data fields>}
	op_canvas = {obj = 0xb4300468}
	i = <value optimized out>
	super_cb = {<synfig::ProgressCallback> = {_vptr.ProgressCallback = 0x84200a8}, cb = 0x0, start = -1226961476, end = -1227767215, tot = 9, w = 136233168}
	total_frames = 0
	quality = 8
	frame_start = 0
	frame_end = 0
	t = {value_ = 0}
	__PRETTY_FUNCTION__ = "virtual bool synfig::Target_Scanline::render(synfig::ProgressCallback*)"
#6  0x081e9fb4 in studio::AsyncRenderer::render_target (this=0x9147278) at ../../../../git/synfigstudio/src/gtkmm/asyncrenderer.cpp:496
---Type <return> to continue, or q <return> to quit---
No locals.
#7  0xb71bae15 in ?? () from /usr/lib/libglibmm-2.4.so.1
No symbol table info available.
#8  0xb6f6e94f in g_thread_create_proxy (data=0x9146800) at /tmp/buildd/glib2.0-2.14.6/glib/gthread.c:635
	__PRETTY_FUNCTION__ = "g_thread_create_proxy"
#9  0xb79544fb in start_thread () from /lib/i686/cmov/libpthread.so.0
No symbol table info available.
#10 0xb6d879ae in clone () from /lib/i686/cmov/libc.so.6
No symbol table info available.