(gdb) run
Starting program: /usr/bin/epiphany 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffe132a700 (LWP 21224)]
[New Thread 0x7fffde2ca700 (LWP 21225)]
[New Thread 0x7fffdd656700 (LWP 21226)]
[New Thread 0x7fffdcc48700 (LWP 21227)]
[New Thread 0x7fff8fffd700 (LWP 21228)]
[New Thread 0x7fff8f7fc700 (LWP 21229)]
[New Thread 0x7fff8effb700 (LWP 21230)]
[New Thread 0x7fff8e7fa700 (LWP 21231)]
[New Thread 0x7fff8d3ff700 (LWP 21234)]
[New Thread 0x7fff77fff700 (LWP 21235)]
[New Thread 0x7fff777fe700 (LWP 21236)]
[New Thread 0x7fff76ffd700 (LWP 21237)]

Thread 1 "epiphany" received signal SIGSEGV, Segmentation fault.
0x00007ffff1d57197 in gtk_action_group_get_action () from /usr/lib/libgtk-3.so.0
(gdb) backtrace
#0  0x00007ffff1d57197 in gtk_action_group_get_action () at /usr/lib/libgtk-3.so.0
#1  0x00005555555a6eaf in ephy_toolbar_constructed ()
#2  0x00007ffff07771e0 in  () at /usr/lib/libgobject-2.0.so.0
#3  0x00007ffff0778dbd in g_object_new_valist () at /usr/lib/libgobject-2.0.so.0
#4  0x00007ffff0779201 in g_object_new () at /usr/lib/libgobject-2.0.so.0
#5  0x00005555555a71fa in ephy_toolbar_new ()
#6  0x000055555558f469 in setup_toolbar ()
#7  0x00005555555908b5 in ephy_window_constructor ()
#8  0x00007ffff0776e5e in  () at /usr/lib/libgobject-2.0.so.0
#9  0x00007ffff0778dbd in g_object_new_valist () at /usr/lib/libgobject-2.0.so.0
#10 0x00007ffff0779201 in g_object_new () at /usr/lib/libgobject-2.0.so.0
#11 0x000055555559178b in ephy_window_new ()
#12 0x00005555555a3834 in session_parse_window ()
#13 0x00005555555a3d1c in session_start_element ()
#14 0x00007ffff049ce54 in  () at /usr/lib/libglib-2.0.so.0
#15 0x00007ffff049de4b in g_markup_parse_context_parse () at /usr/lib/libglib-2.0.so.0
#16 0x00005555555a48b3 in load_stream_read_cb ()
#17 0x00007ffff0a17c9a in  () at /usr/lib/libgio-2.0.so.0
#18 0x00007ffff0a3fc23 in  () at /usr/lib/libgio-2.0.so.0
#19 0x00007ffff0a3fc59 in  () at /usr/lib/libgio-2.0.so.0
#20 0x00007ffff04998b5 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#21 0x00007ffff0499c78 in  () at /usr/lib/libglib-2.0.so.0
#22 0x00007ffff0499d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#23 0x00007ffff0a5560d in g_application_run () at /usr/lib/libgio-2.0.so.0
#24 0x0000555555589654 in main ()