FreeRTOS http only working once (IllegalInstruction)

[schnabulator]

Hello
this is my arduino code for an esp32 which just setups wifi and then runs the setGoogleCalendar() function forever:

Code: Untitled.c Select all

#include <WiFi.h>

#include <HTTPClient.h>

#include "time.h"



// Replace with your network credentials

const char* ssid = "FRITZ!Box 6490 Cable";

const char* password = "xxxx";



// NTP server to request epoch time

const char* ntpServer = "fritz.box";



const String gooleAppsScriptUrl = "https://script.google.com/macros/s/xxxxxxxxxxxx/exec";



RTC_DATA_ATTR int bootCount = 0;



//Multithreading

TaskHandle_t googleCalendar;



void setup() {

  // put your setup code here, to run once:

  Serial.begin(115200);

  WiFi.begin(ssid, password);

  Serial.print("Connecting to WiFi ..");

  while (WiFi.status() != WL_CONNECTED) {             

    if(millis() < 12000){

      Serial.print('.');

      delay(1000);

    }

    else {

      ESP.restart();

    }

  }

  Serial.println(WiFi.localIP());

}



void loop() {

  // put your main code here, to run repeatedly:

  if (googleCalendar == NULL){

    xTaskCreate(

    setGoogleCalendar

    ,  "Google calendar request"

    ,  20000  // Stack size

    ,  NULL  // When no parameter is used, simply pass NULL

    ,  1  // Priority

    ,  &googleCalendar // With task handle we will be able to manipulate with this task.

    );

  }

}



void setGoogleCalendar(void *pvParameters) {

  (void) pvParameters;

  

  HTTPClient http;

  http.begin(gooleAppsScriptUrl.c_str());

  http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);

  String payload = "";

  int httpStatus = http.GET();



  Serial.println("this is the last thing that gets printed in the second run");



  if (httpStatus == 200){

    Serial.println("this will not get printed in the second run");

    delay(500);

    payload = http.getString();

  }

  else {

    Serial.println("failed google calendar http request: " + httpStatus);

    return;

  }

  

  Serial.println(payload);



  http.end();

  googleCalendar = NULL;

  vTaskDelete(NULL);

}

when i run the setGoogleCalendar function once everything works as it should. However the second time it only runs until the first Serial.println and spits out this error:

Guru Meditation Error: Core 0 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x400d29ec: 00250602 afa2f01d f0a0223c
Core 0 register dump:
PC : 0x400d29f0 PS : 0x00060130 A0 : 0x00000000 A1 : 0x3fffc790
A2 : 0xa38d7f39 A3 : 0x3fffc880 A4 : 0x00000000 A5 : 0x00000000
A6 : 0x00000000 A7 : 0x00000000 A8 : 0xa38d7f39 A9 : 0x3fffc770
A10 : 0x3fffc7bc A11 : 0x400d4d78 A12 : 0xa38d7f39 A13 : 0x00000000
A14 : 0x3fffc828 A15 : 0x3fffc838 SAR : 0x00000017 EXCCAUSE: 0x00000000
EXCVADDR: 0x00000000 LBEG : 0x400899bc LEND : 0x400899c7 LCOUNT : 0x00000000


Backtrace: 0x400d29ed:0x3fffc790




ELF file SHA256: a313233634d34ef3

when i put it in the stack trace decoder i get this result:

0x400d29ec: setGoogleCalendar(void*) at C:\Users\johan\OneDrive\Dokumente\Arduino\Freertostestwithtask_copy_20240122224400\Freertostestwithtask_copy_20240122224400.ino:76
0x400d29f0: setGoogleCalendar(void*) at C:\Users\johan\OneDrive\Dokumente\Arduino\Freertostestwithtask_copy_20240122224400\Freertostestwithtask_copy_20240122224400.ino:76
0x400d4d78: TLSTraits::~TLSTraits() at C:\Users\johan\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\libraries\HTTPClient\src\HTTPClient.cpp:64
0x400d29ed: setGoogleCalendar(void*) at C:\Users\johan\OneDrive\Dokumente\Arduino\Freertostestwithtask_copy_20240122224400\Freertostestwithtask_copy_20240122224400.ino:76

Due to the error occuring in the last line with only a bracket i expected it to have something to do with rtos tasks not being closed but according to espressif documentation this error should not occur.
Now i have noticed that core 0 panics which runs the wifi functions? and occurs in the http library. However this error only happens when i set the function as a seperate task and does not happen when i let it run normaly.
How is this behaviour possible?

Thank you for your help in advance

[Sprite]

Not sure if it's the issue, but there's a 'return' in your task (when httpStatus is not 200). You cannot do that; that'll panic; you need to do the vTaskDelete(NULL) there as well.