I am using IAR 8.x with i.MX RT1020 and a modified lwip_examples\lwip_httpsrv project. I have swapped out the server with my own server, but everything else is as it was originally set up.
The code gets stuck in FreeRTOS list.c at line 150. I have looked at all the recommendations provided in the comments at this code location. Macro configASSERT() was already set in this project. I have added stack check.
I have attached the stack trace. Function HttpSocket_netconnCB is my own netconn callback, e.g.
netconn_new_with_callback(NETCONN_TCP, HttpSocket_netconnCB)
This is an accept as you can see from the stack trace.
Code line 150:
/* *** NOTE ***********************************************************
If you find your application is crashing here then likely causes are
listed below. In addition see https://www.freertos.org/FAQHelp.html for
more tips, and ensure configASSERT() is defined!
https://www.freertos.org/a00110.html#configASSERT
1) Stack overflow -
see https://www.freertos.org/Stacks-and-stack-overflow-checking.html
2) Incorrect interrupt priority assignment, especially on Cortex-M
parts where numerically high priority values denote low actual
interrupt priorities, which can seem counter intuitive. See
https://www.freertos.org/RTOS-Cortex-M3-M4.html and the definition
of configMAX_SYSCALL_INTERRUPT_PRIORITY on
https://www.freertos.org/a00110.html
3) Calling an API function from within a critical section or when
the scheduler is suspended, or calling an API function that does
not end in "FromISR" from an interrupt.
4) Using a queue or semaphore before it has been initialised or
before the scheduler has been started (are interrupts firing
before vTaskStartScheduler() has been called?).
**********************************************************************/
for( pxIterator = ( ListItem_t * ) &( pxList->xListEnd ); pxIterator->pxNext->xItemValue <= xValueOfInsertion; pxIterator = pxIterator->pxNext ) ;
