Please help me with ESP32 Guru meditation error core 0

[FeherAron6]

The strings are global variables

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1. char str_data[5], str_topic[11];
2. char flag_topic[11] = {'t','o','d','e','v','/','f','l','a','g','s'};
3. char ref_topic[9] = {'t','o','d','e','v','/','r','e','f'};

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.

[ESP_Sprite]

Just guessing here, as I'm not that familiar with the mqtt code, but are you sure the topic and data are zero-terminated? If not, the strcpy will copy lots of bytes, overwriting lots of static data.

[FeherAron6]

It is not zero terminated - or at least the payload is certainly not. When I send the data "todev/flags" from node-red, the esp32 sees it as a char array of length 11. That is why I had to compare it to the string shown in the previous reply, but I've used strncmp for the most part.

Are you saying that I should change the topic and data copy lines from strcpy to strncpy? I could measure the maximum string length in node-red, and use that value for every copy.

[FeherAron6]

Just guessing here, as I'm not that familiar with the mqtt code, but are you sure the topic and data are zero-terminated? If not, the strcpy will copy lots of bytes, overwriting lots of static data.

This was the problem. I've replaced the

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1. strcpy(str_topic, event->topic);
2. strcpy(str_data, event->data);

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lines with

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1. strncpy(str_topic, event->topic, event->topic_len);
2. strncpy(str_data, event->data, event->data_len);

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and everything works as intended.

Thank you so much for these invaluable responses. I've learnt a lot in these few days.

[ESP_Sprite]

Nice. Note that if you use strncpy, str_topic and str_data themselves also won't be null-terminated, so if your later code assumes they are, you'll have the same issues all over again. Perhaps it's an idea to null-terminate them yourself so you'll at least not have that trap to fall down in.

[Alan Collins]

I have the same issue, while using simple "Hello World" example from platformIO. This is part of the LOG I get from console:

Guru Meditation Error: Core 0 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x400d2c40: 775f2289 dd55d557 57f7d755
Core 0 register dump:
PC : 0x400d2c47 PS : 0x00060130 A0 : 0x800d2cb5 A1 : 0x3ffe3930
A2 : 0x3ffe3970 A3 : 0x3ffc0000 A4 : 0x3ffc3050 A5 : 0x3ffe3970
A6 : 0x00000000 A7 : 0x00000000 A8 : 0x0000002c A9 : 0x3ffe3bb0
A10 : 0x0000000a A11 : 0x00000000 A12 : 0x00000000 A13 : 0x00002000
A14 : 0x3ffe3ba7 A15 : 0x00000200 SAR : 0x00000005 EXCCAUSE: 0x00000000
EXCVADDR: 0x00000000 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0x00000000

As, you can see PC is located in 0x400d2c47

Looking into my .map file, I see the code is happening inside the .pioenvs\esp32dev\libheap.a(heap_caps_init.o)

This data is persistent if I use the HelloWorld, or my application. Both fail with Ilegal instruction at the Lebheap library.

This problem is not happened in the ESP32-WROOM-32, but happens with ESP32-WROOM-32D, which is supposed to be the same.

I continue my debug. I´ll keep you posted in my findings.

[ESP_Sprite]

You may want to investigate your power supply; sometimes these errors originate in a brownout.

[Ritesh]

You may want to investigate your power supply; sometimes these errors originate in a brownout.

Hi,

We are also recomanding to use at least 5V 1 Amp into our device in which we have used ESP32 Module.