Debugging crashes at the middle of the program

is the chip getting hot ?

can you hold your finger on ?

Start from cold, see how long it takes to get hot.

on my desk the F091 is reporting an internal temp of 37.7C, slightly warm to touch.

do you have cache turned on ?

is it a custom board ?

you could check the voltage on Vdda/Vdd/Vss pins, see if it is stable and fairly noiseless.

is Boot0 floating ? and NRST ?

Stack overflows or gets trashed and jumps into ROM?

Thank you guys for reponding.

I troubleshooted the problem and discovered that when I comment one line, the MCU works just fine.

This is the code:

SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |

If I remove the comment from the line in bold, the micro hangs again just as in the video.

The original code is like this:

SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |

The 

SysTick_CTRL_TICKINT_Msk 

is Bit-1 

SysTick Control and Status register. 

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0662b/Babieigh.html

I suppose that there is a missing function that handles the interrupt request.

So I defined SysTick_Handler  and now the code look like  this:

#include 'stm32f031x6.h'

void SystemClock_Config(void);

volatile uint32_t vect = 0;

void SysTick_Handler(void)

int main(void) {

HAL_Init();

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);

}

GPIO_InitTypeDef GPIO_InitStruct;

/* GPIO Ports Clock Enable */

/*Configure GPIO pin Output Level */

/*Configure GPIO pins : PA4 PA8 */

}

But still the same error.

Please see the comment above I edited it. It is basically impossible to have a stack overflow. It may not be linked, but how would I know?