Debugging c code tips?

current stack trace

(gdb) bt
#0  0x000008c8 in ?? ()
=1  <signal handler called>
=2  0x0000092e in ?? ()
=3  <signal handler called>
=4  0x00053c02 in sd_softdevice_enable (p_clock_lf_cfg=0x2000fe28, fault_handler=0x53bb1 <softdevice_fault_handler>)
    at targetlibs/nrf5x_12/components/softdevice/s132/headers/nrf_sdm.h:286
=5  0x00038dc2 in softdevice_handler_init (p_ble_evt_buffer=0x2000b8c8 <BLE_EVT_BUFFER.2>, ble_evt_buffer_size=80, evt_schedule_func=0x0,
    p_clock_lf_cfg=0x2000fe28) at targetlibs/nrf5x_12/components/softdevice/common/softdevice_handler/softdevice_handler.c:277
=6  softdevice_handler_init (p_ble_evt_buffer=0x2000b8c8 <BLE_EVT_BUFFER.2>, ble_evt_buffer_size=80, evt_schedule_func=0x0,
    p_clock_lf_cfg=0x2000fe28) at targetlibs/nrf5x_12/components/softdevice/common/softdevice_handler/softdevice_handler.c:277
+7  ble_stack_init () at targets/nrf5x/bluetooth.c:2539
+8  jsble_init () at targets/nrf5x/bluetooth.c:2862
+9  0x0003a27c in jshInit () at targets/nrf5x/jshardware.c:961
+10 main () at targets/nrf5x/main.c:27