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: [Select all] [Expand/Collapse]

1. #include <WiFi.h>
2. #include <HTTPClient.h>
3. #include "time.h"
4.  
5. // Replace with your network credentials
6. const char* ssid = "FRITZ!Box 6490 Cable";
7. const char* password = "xxxx";
8.  
9. // NTP server to request epoch time
10. const char* ntpServer = "fritz.box";
11.  
12. const String gooleAppsScriptUrl = "https://script.google.com/macros/s/xxxxxxxxxxxx/exec";
13.  
14. RTC_DATA_ATTR int bootCount = 0;
15.  
16. //Multithreading
17. TaskHandle_t googleCalendar;
18.  
19. void setup() {
20.   // put your setup code here, to run once:
21.   Serial.begin(115200);
22.   WiFi.begin(ssid, password);
23.   Serial.print("Connecting to WiFi ..");
24.   while (WiFi.status() != WL_CONNECTED) {            
25.     if(millis() < 12000){
26.       Serial.print('.');
27.       delay(1000);
28.     }
29.     else {
30.       ESP.restart();
31.     }
32.   }
33.   Serial.println(WiFi.localIP());
34. }
35.  
36. void loop() {
37.   // put your main code here, to run repeatedly:
38.   if (googleCalendar == NULL){
39.     xTaskCreate(
40.     setGoogleCalendar
41.     ,  "Google calendar request"
42.     ,  20000  // Stack size
43.     ,  NULL  // When no parameter is used, simply pass NULL
44.     ,  1  // Priority
45.     ,  &googleCalendar // With task handle we will be able to manipulate with this task.
46.     );
47.   }
48. }
49.  
50. void setGoogleCalendar(void *pvParameters) {
51.   (void) pvParameters;
52.  
53.   HTTPClient http;
54.   http.begin(gooleAppsScriptUrl.c_str());
55.   http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
56.   String payload = "";
57.   int httpStatus = http.GET();
58.  
59.   Serial.println("this is the last thing that gets printed in the second run");
60.  
61.   if (httpStatus == 200){
62.     Serial.println("this will not get printed in the second run");
63.     delay(500);
64.     payload = http.getString();
65.   }
66.   else {
67.     Serial.println("failed google calendar http request: " + httpStatus);
68.     return;
69.   }
70.  
71.   Serial.println(payload);
72.  
73.   http.end();
74.   googleCalendar = NULL;
75.   vTaskDelete(NULL);
76. }

GeSHi © Codebox Plus Extension

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

[ESP_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.