STM32F4, FreeRTOS stack overflow hook function

I use freertos stack overflow hook function.

So, I port the function "vApplicationStackOverflowHook" and define macro "configCHECK_FOR_STACK_OVERFLOW" set to 2.

i think hook function executed once when some task use the stack, over it's boundary.

but i see stack overflow once occurs, hook function executed continuously. (every task execution )

this is correct ?. if then, do i have to clear kind of "stack over flow flag" ?

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