Full GDB backtrace

0x0000000000442dd3 in load_allowed_modes_ready ()
(gdb) backtrace
#0  0x0000000000442dd3 in load_allowed_modes_ready ()
#1  0x00007fd4b6436ab7 in g_simple_async_result_complete () from /usr/lib/libgio-2.0.so.0
#2  0x0000000000434d18 in at_command_parse_response ()
#3  0x00000000004831ab in handle_response ()
#4  0x0000000000480b93 in mm_serial_port_got_response ()
#5  0x000000000048272b in data_available ()
#6  0x00007fd4b5ec5f06 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#7  0x00007fd4b5ec6258 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fd4b5ec665a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#9  0x0000000000426da6 in main ()