Nucleo446RE + A7672S + GPS + Firebase] User LED Blinks and Serial Port Stops Responding

[Nikitanagar]

I am using a Nucleo446RE with the following setup:

GSM Module: A7672S (connected via PA10 and PA9)
GPS Module: Connected via PC5 and PB10
Button: Connected to PB5
I am working with the following libraries:

TinyGsmClient
STM32FreeRTOS
FirebaseClient
TinyGPSPlus

After running the program for a while, the problem occurs. The user LED starts blinking, and the serial port stops responding. This issue interrupts communication with the firebase, GSM, and GPS modules.

Steps to Reproduce
Connect GSM (A7672S) to PA3 and PA2 (STM32).
Connect the GPS module to PB7 and PB6.
Configure PB14 as input for the button.
Upload the code using the Arduino IDE.
Observe the system for a few minutes.
Note that the user LED starts blinking, and serial communication halts.

What I Have Tried
Verified power supply (using a reliable source with sufficient current).
Reduced FreeRTOS stack sizes for tasks.
Optimized code to avoid blocking calls (e.g., replaced delay() with vTaskDelay()).
Debugged serial communication with the GSM and GPS modules separately.

Expected Behavior
The system should continuously communicate with GSM, GPS, and Firebase without interruptions.

Actual Behavior
User LED blinks, indicating a fault.
Serial communication halts.
Tasks stop functioning as expected.

Environment
Board: Nucleo446RE
GSM Module: A7670C
GPS Module: Neo-6m
IDE: Arduino 2.3.4
Libraries:
TinyGSM
STM32FreeRTOS
FirebaseClient

Questions

1. Are there any known issues with using STM32FreeRTOS with GSM and GPS modules simultaneously?
2. Could this be a memory overflow issue? If so, how can I debug it?

[fpistm]

If LED stars blinking you reached a default handler defined by the STM32FREERTOS library. Your best bet is to debug on your side.

[fpistm]

Here the handler definitions I talk about:
https://github.com/stm32duino/STM32FreeRTOS/blob/d05df76c1ab0664c4bf7ef8318d80baac164186c/src/STM32FreeRTOS.c#L26
So depending of the number of blink you can known which one is raised.

[Nikitanagar]

Thank you @fpistm, In my case, LED is blinking 4 times, so

 // catch exceptions
/** Hard fault - blink four short flash every two seconds */
void hard_fault_isr() {
  //printf("Hard fault isr\n");
  errorBlink(4);
}
/** Hard fault - blink four short flash every two seconds */
void HardFault_Handler() {
  errorBlink(4);
}

[fpistm]

Ok. Anyway hard to help. You will have to debug. FreeRTOS is provided "as is". It can requires several configuration depending of its usage.