What is the meaning of "Stack smashing protect failure"?

[sysizlayan]

Hardware:

Board: ESP32 Dev Module
Core Installation/update date: Always latest
IDE name: Arduino IDE
Flash Frequency: 80Mhz
Upload Speed: 921600

Description:

Hi,
I am taking stack smashing protect failure time to time. I could not find the reason, backtrace is very limited. What causes this message? I have extended the stack to 32KB from 8KB, still happens.

Debug Messages:

Stack smashing protect failure!

abort() was called at PC 0x400ef580 on core 1

Backtrace: 0x4008d9ec:0x3ffd9880 0x4008dbc7:0x3ffd98a0 0x400ef580:0x3ffd98c0 0x400d6c07:0x3ffd98e0 0x40150964:0x3ffd9920

[copercini]

It looks like a buffer overflow...

from docummentation:

         Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
        smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
        The guards are initialized when a function is entered and then checked when the function exits.
        If a guard check fails, program is halted. Protection has the following modes:
          - In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with buffers larger than
            8 bytes are protected.
          - STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions to be protected -- those that
            have local array definitions, or have references to local frame addresses.
          - In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.

        Modes have the following impact on code performance and coverage:
          - performance: NORMAL > STRONG > OVERALL
          - coverage: NORMAL < STRONG < OVERALL

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