The FreeRTOS web site says that one must implement function vApplicationStackOverflowHook when enabling configCHECK_FOR_STACK_OVERFLOW . This is not the case for STM32FreeRTOS as it is defined in STM32FreeRTOS.c and there is no option to override. Suggest to document this and to clarify that the user must ensure that LED_BUILTIN is defined in their variant.h for their board as vApplicationStackOverflowHook will hang (while 1) when stack overflow detected and flash the LED. At the very least of not documented, hopefully this post will be found by users through google and will be helpful.

Perhaps vApplicationStackOverflowHook and other error functions could be defined as weak in STM32FreeRTOS.c so that the user can override.