New comment by newbluemoon on void-packages repository

https://github.com/void-linux/void-packages/pull/32358#issuecomment-894501029

Comment:
Here you go:
```
(gdb) run
Starting program: /builddir/synfigstudio-1.4.2/test/.libs/lt-app_layerduplicate 
[New LWP 23222]
[New LWP 23223]
[New LWP 23224]
[New LWP 23225]
[New LWP 23226]
[New LWP 23227]
[New LWP 23228]
[New LWP 23229]
[New LWP 23230]
[New LWP 23231]
[New LWP 23232]
[New LWP 23233]
[New LWP 23234]
[New LWP 23235]
[New LWP 23236]
[New LWP 23237]
synfig(23218) [19:29:09] info: rendering threads 16
synfig(23218) [19:29:09] warning: Cannot open ./synfig_modules.cfg
synfig(23218) [19:29:09] warning: Cannot open /tmp/.local/share/synfig/synfig_modules.cfg
synfig(23218) [19:29:09] info: Loading modules from /etc/synfig_modules.cfg
synfig(23218) [19:29:09] info: Loading lyr_std..
synfig(23218) [19:29:09] info: Loading lyr_freetype..
synfig(23218) [19:29:09] info: Loading mod_geometry..
synfig(23218) [19:29:09] info: Loading mod_gradient..
synfig(23218) [19:29:09] info: Loading mod_particle..
synfig(23218) [19:29:09] info: Loading mod_example..
synfig(23218) [19:29:09] info: Loading mod_gif..
synfig(23218) [19:29:09] info: Loading mod_imagemagick..
synfig(23218) [19:29:09] info: Loading mod_magickpp..
synfig(23218) [19:29:09] info: Loading mod_mng..
synfig(23218) [19:29:09] info: Loading mod_noise..
synfig(23218) [19:29:09] info: Loading mod_filter..
synfig(23218) [19:29:09] info: Loading mod_ffmpeg..
synfig(23218) [19:29:09] info: Loading mod_bmp..
synfig(23218) [19:29:09] info: Loading mod_dv..
synfig(23218) [19:29:09] info: Loading mod_png..
synfig(23218) [19:29:09] info: Loading mod_ppm..
synfig(23218) [19:29:09] info: Loading mod_openexr..
synfig(23218) [19:29:09] info: Loading mod_jpeg..
synfig(23218) [19:29:09] info: Loading mod_libavcodec..
synfig(23218) [19:29:09] info: Loading mod_yuv420p..
synfig(23218) [19:29:09] info: Loading mod_svg..

Thread 1 "lt-app_layerdup" received signal SIGSEGV, Segmentation fault.
0x00007ffff7d23710 in synfigapp::Action::LayerDuplicate::replace_valuenodes(std::map<etl::handle<synfig::Layer>, etl::handle<synfig::Layer>, std::less<etl::handle<synfig::Layer> >, std::allocator<std::pair<etl::handle<synfig::Layer> const, etl::handle<synfig::Layer> > > > const&, std::map<etl::rhandle<synfig::ValueNode>, etl::rhandle<synfig::ValueNode>, std::less<etl::rhandle<synfig::ValueNode> >, std::allocator<std::pair<etl::rhandle<synfig::ValueNode> const, etl::rhandle<synfig::ValueNode> > > > const&) () from /builddir/synfigstudio-1.4.2/src/synfigapp/.libs/libsynfigapp.so.0
(gdb) bt
#0  0x00007ffff7d23710 in synfigapp::Action::LayerDuplicate::replace_valuenodes(std::map<etl::handle<synfig::Layer>, etl::handle<synfig::Layer>, std::less<etl::handle<synfig::Layer> >, std::allocator<std::pair<etl::handle<synfig::Layer> const, etl::handle<synfig::Layer> > > > const&, std::map<etl::rhandle<synfig::ValueNode>, etl::rhandle<synfig::ValueNode>, std::less<etl::rhandle<synfig::ValueNode> >, std::allocator<std::pair<etl::rhandle<synfig::ValueNode> const, etl::rhandle<synfig::ValueNode> > > > const&) () from /builddir/synfigstudio-1.4.2/src/synfigapp/.libs/libsynfigapp.so.0
#1  0x00007ffff7d25ad6 in synfigapp::Action::LayerDuplicate::prepare() ()
   from /builddir/synfigstudio-1.4.2/src/synfigapp/.libs/libsynfigapp.so.0
#2  0x00007ffff7e7e1da in synfigapp::Action::Super::perform() ()
   from /builddir/synfigstudio-1.4.2/src/synfigapp/.libs/libsynfigapp.so.0
#3  0x000055555556ca4a in test_synfigapp_layerduplicate_both_layer_duplicate_and_linked_layers() ()
#4  0x000055555556186a in main ()
(gdb)
```