FreeRTOS error on small core

I’m trying to perform a simple FreeRTOS task on milk-v duo

#include "FreeRTOS.h"
#include "task.h"

void app_task(void * param)
  while(1) {
    printf("Hello RiSC-V!\r\n");

void main_cvirtos(void)
	printf("create cvi task\n");

	/* Start the tasks and timer running. */
    xTaskCreate(app_task, "app_task", 1024, NULL, 1, NULL);	

    /* If all is well, the scheduler will now be running, and the following
    line will never be reached.  If the following line does execute, then
    there was either insufficient FreeRTOS heap memory available for the idle
    and/or timer tasks to be created, or vTaskStartScheduler() was called from
    User mode.  See the memory management section on the FreeRTOS web site for
    more details on the FreeRTOS heap  The
    mode from which main() is called is set in the C start up code and must be
    a privileged mode (not user mode). */
    printf("cvi task end\n");
	for (;;)

Extracted UART log shows :
[ 3.016780] res-reg: start: 0x1900000, end: 0x1900fff, virt-addr(ffffffd004228000).
[ 3.025246] cvi_rtos_cmdqu_probe DONE
[ 3.029765] [cvi_spinlock_init] success
[ 3.219010] random: crng init done
[ 3.222543] random: 1 urandom warning(s) missed due to ratelimiting
[ 3.249413] RTOS_CMDQU_SEND_WAIT timeout
[ 3.258579] communicate with rtos fail

Update: milk-v duo little core is working even with the error message. There is some interference between the USB & Ethernet IOB duo board and the serial USB converter I’m using.

I believe if the Ethernet port is used you need to ssh over it rather than the USB