MPU Fault in Bluetooth: HCI Power Control

[vasilje]

OS:Ubuntu

Board: nrf52840DK

SDK: NRF Connect SDK (master branch)

After building provided example: Bluetooth: HCI Power Control and flashing the board, in serial monitor I get the following errors:

[00:00:00.000,091] <err> os: ***** MPU FAULT *****
[00:00:00.000,091] <err> os:   Data Access Violation
[00:00:00.000,122] <err> os:   MMFAR Address: 0x20004e80
[00:00:00.000,122] <err> os: r0/a1:  0x20004e38  r1/a2:  0x00000000  r2/a3:  0x00000220
[00:00:00.000,122] <err> os: r3/a4:  0x20004e80 r12/ip:  0xe000ed90 r14/lr:  0x0001c993
[00:00:00.000,122] <err> os:  xpsr:  0x81000000
[00:00:00.000,122] <err> os: Faulting instruction address (r15/pc): 0x0001e976
[00:00:00.000,122] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[00:00:00.000,152] <err> os: Current thread: 0x20002500 (unknown)
[00:00:01.049,957] <err> fatal_error: Resetting system

Commands used to build and flash:

west build -p auto -b nrf52840dk_nrf52840 samples/bluetooth/hci_pwr_ctrl
west flash

When I tried building and flashing just with zephyr original code, from their master branch, everything worked without any problems. What can be wrong?

[AMarch01]

I know this is old, but in case someone runs across this while looking for a problem in hci_pwr_ctrl application.
I wanted to add that this code has given me an issue in nrfConnect 2.7.0. The target was an nrf52840. The program would seem to operate correctly but would memfault if I hit "connect" in the nrf Connect phone application.

This problem was resolved when I added:  

CONFIG_BT_LL_SW_SPLIT=y

to the prj.conf file.