.
Thread 3 (Thread 0x7fe6c3fff700 (LWP 1764)):
#0  0x00007fe6d7a13b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fe6d7f4eff6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fe6d7f4f45a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fe6d091598b in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
No symbol table info available.
#4  0x00007fe6d7f709b5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fe6d7cf1e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#6  0x00007fe6d7a1f4bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#7  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7fe6d2347700 (LWP 1761)):
#0  0x00007fe6d7a13b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fe6d7f4eff6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fe6d7f4f45a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fe6d85142a6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#4  0x00007fe6d7f709b5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007fe6d7cf1e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#6  0x00007fe6d7a1f4bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#7  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7fe6d963b940 (LWP 1755)):
#0  0x00007fe6d8e2bc34 in gdk_pixbuf_get_n_channels@plt () from /usr/lib/libgnome-desktop-3.so.2
No symbol table info available.
#1  0x00007fe6d8e310ad in ?? () from /usr/lib/libgnome-desktop-3.so.2
No symbol table info available.
#2  0x00007fe6d8e33808 in gnome_bg_create_surface () from /usr/lib/libgnome-desktop-3.so.2
No symbol table info available.
#3  0x00007fe6b83e864c in ?? () from /usr/lib/gnome-settings-daemon-3.0/libbackground.so
No symbol table info available.
#4  0x00007fe6d820beaa in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#5  0x00007fe6d8224721 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#6  0x00007fe6d8225222 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#7  0x00007fe6d8e31b06 in ?? () from /usr/lib/libgnome-desktop-3.so.2
No symbol table info available.
#8  0x00007fe6d7f4f8db in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#9  0x00007fe6d7f4ec9a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#10 0x00007fe6d7f4f060 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#11 0x00007fe6d7f4f45a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#12 0x00007fe6d8913ecd in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#13 0x0000000000403801 in main ()
No symbol table info available.