FreeRTOS sdk14.0 example ble_app_hrs_freertos crashing


I just changed the ble_app_hrs_freertos example from SDK v 14.0:

  • APP_ADV_TIMEOUT_IN_SECONDS to 5 seconds in main.c
  • Enable debug log for various components in sdk_config.h
  • Redirected NRF_LOG to use SEGGER_RTT rather than UART.

Below is the Terminal output:

<debug> nrf_sdh: State request: 0x00000000
<debug> nrf_sdh: Notify observer 0x00033E50 => ready
<debug> nrf_sdh: State change: 0x00000000
<debug> nrf_sdh: State change: 0x00000001
<debug> nrf_sdh_ble: RAM starts at 0x20005668
<warning> nrf_sdh_ble: RAM start should be adjusted to 0x200020E0.
<warning> nrf_sdh_ble: RAM size should be adjusted to 0xDF20.
<debug> nrf_sdh_freertos: Creating a SoftDevice task.
<debug> nrf_sdh_freertos: Enter softdevice_task.
<info> app: Fast advertising.
<debug> nrf_sdh_ble: BLE event: 0x1B.
<error> app: Fatal

The Iast line Fatal happens after the 5 seconds time out, when the system tries to power off inside sleep_mode_enter() with sd_power_system_off()

I dont quite understand what is happening inside sd_power_system_off(). Could someone please shed some light and help me fix this issue ?