nrf: clock_control: Fatal error during initialization

[tsvehagen]

Describe the bug
Having a combination of CONFIG_POLL=y, a large mbedtls heap and using the RC oscillator as K32SRC causes a fatal error during initialization.

Changing anyone of these and the problem seem to go away. Another way to make the problem go away is to change the init prio of mbedtls where the heap initialization happens. (modules/crypto/mbedtls/zephyr_init.c)

To Reproduce
I used a nrf52840dk_nrf52840 board and the following prj.conf in samples/hello_world

CONFIG_POLL=y

CONFIG_MBEDTLS=y
CONFIG_MBEDTLS_BUILTIN=y
CONFIG_MBEDTLS_ENABLE_HEAP=y
CONFIG_MBEDTLS_HEAP_SIZE=100000

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

Screenshots or console output
Here is a backtrace from @carlescufi

(gdb) bt
#0  arch_system_halt (reason=reason@entry=0) at /home/carles/src/zephyr/zephyr/kernel/fatal.c:31
#1  0x00003f7c in k_sys_fatal_error_handler (reason=reason@entry=0,
    esf=esf@entry=0x20019b88 <z_interrupt_stacks+1888>) at /home/carles/src/zephyr/zephyr/kernel/fatal.c:43
#2  0x00003fa0 in z_fatal_error (reason=reason@entry=0, esf=esf@entry=0x20019b88 <z_interrupt_stacks+1888>)
    at /home/carles/src/zephyr/zephyr/kernel/fatal.c:123
#3  0x00003bdc in z_arm_fatal_error (reason=reason@entry=0, esf=esf@entry=0x20019b88 <z_interrupt_stacks+1888>)
    at /home/carles/src/zephyr/zephyr/arch/arm/core/aarch32/fatal.c:47
#4  0x00001130 in z_arm_fault (msp=<optimized out>, psp=<optimized out>, exc_return=<optimized out>)
    at /home/carles/src/zephyr/zephyr/arch/arm/core/aarch32/cortex_m/fault.c:969
#5  0x00000ffc in z_arm_usage_fault () at /home/carles/src/zephyr/zephyr/arch/arm/core/aarch32/cortex_m/fault_s.S:85
#6  <signal handler called>
#7  0x00004718 in sys_dlist_remove (node=0x0 <z_finalize_fd>) at ../include/sys/dlist.h:518
#8  sys_dlist_get (list=list@entry=0x200003b0 <k_sys_work_q+8>) at ../include/sys/dlist.h:518
#9  z_handle_obj_poll_events (events=events@entry=0x200003b0 <k_sys_work_q+8>, state=state@entry=4)
    at /home/carles/src/zephyr/zephyr/kernel/poll.c:406
#10 0x00004030 in handle_poll_events (state=4, queue=0x200003a8 <k_sys_work_q>)
    at /home/carles/src/zephyr/zephyr/kernel/queue.c:179
#11 queue_insert (queue=0x200003a8 <k_sys_work_q>, prev=0x0 <z_finalize_fd>, data=<optimized out>,
    alloc=<optimized out>) at /home/carles/src/zephyr/zephyr/kernel/queue.c:179
#12 0x000008cc in clkstarted_handle (type=<optimized out>, dev=0x2000005c <__device_clock_nrf>)
    at /home/carles/src/zephyr/zephyr/drivers/clock_control/nrf_power_clock.c:366
#13 0x000008fe in nrf_power_clock_isr (arg=<optimized out>)
    at /home/carles/src/zephyr/zephyr/drivers/clock_control/nrf_power_clock.c:421
#14 0x00000fa6 in _isr_wrapper () at /home/carles/src/zephyr/zephyr/arch/arm/core/aarch32/isr_wrapper.S:195

Environment:
Commit 1a89ca1

[ioannisg]

will investigate