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Description
Hardware:
Board: ESP32 Dev Module, also Heltec WiFi kit 32
Core Installation version: 1.0.3-rc2
IDE name: Arduino IDE 1.8.8 also 1.8.9
Flash Frequency: 80MHz
PSRAM enabled: no
Upload Speed: 921600
Computer OS: Windows 7, Windows 10
Description:
Stack smashing protection failure occurs in String. This problem seems to be related to the order of dynamic allocation for String data in the function and the length of the string.
Sketch:
#include <Arduino.h>
void setup() {
delay(1000);
Serial.begin(115200);
String reps = "/";
String replacement = "/";
String source = "/save";
Serial.printf("source:%s(%d)\nreplacement:%s(%d)\nreps:%s(%d)\n", source.c_str(), source.length(), replacement.c_str(), replacement.length(), reps.c_str(), reps.length());
Serial.printf("source#L11:%s(%d)\n", source.c_str(), source.length());
source.replace(reps, replacement);
Serial.printf("source#L13:%s(%d)\n", source.c_str(), source.length());
source.trim();
Serial.printf("source#L15:%s(%d)\n", source.c_str(), source.length());
}
void loop() {
}Debug Messages:
source:/save(5)
replacement:/(5)
reps:/(1)
source#L11:/save(5)
source#L13:/save(9)
source#L15:/save(9)
Stack smashing protect failure!
abort() was called at PC 0x400d5b70 on core 1
Backtrace: 0x4008b544:0x3ffb1ee0 0x4008b771:0x3ffb1f00 0x400d5b70:0x3ffb1f20 0x400d0d88:0x3ffb1f40 0x400d2027:0x3ffb1fb0 0x4008a091:0x3ffb1fd0
Rebooting...
ets Jun 8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:928
ho 0 tail 12 room 4
load:0x40078000,len:8740
load:0x40080400,len:5816
entry 0x4008069c
Stack dump decoded:
Decoding 7 results
0x400d5de4: __stack_chk_fail at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/stack_check.c line 36
0x4008b544: invoke_abort at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/panic.c line 707
0x4008b771: abort at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/panic.c line 707
0x400d5de4: __stack_chk_fail at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/stack_check.c line 36
0x400d0de0: setup() at C:\Users\hieromon\Documents\Arduino\StrRep/StrRep.ino line 17
0x400d21a7: loopTask(void*) at C:\Users\hieromon\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.3-rc2\cores\esp32/main.cpp line 14
0x4008a091: vPortTaskWrapper at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/port.c line 355 (discriminator 1)
Preliminary survey:
-
The violation seems to be caused by releasing the string buffer in the termination process of the setup().
-
Oddly if the position of the
repsinitialization statement moves, the problem does not occur.
#include <Arduino.h>
void setup() {
delay(1000);
Serial.begin(115200);
String replacement = "/";
String source = "/save";
String reps = "/"; // move to here
Serial.printf("source:%s(%d)\nreplacement:%s(%d)\nreps:%s(%d)\n", source.c_str(), source.length(), replacement.c_str(), replacement.length(), reps.c_str(), reps.length());
// if (source.length() == reps.length() + replacement.length())
// source += " ";
Serial.printf("source#L11:%s(%d)\n", source.c_str(), source.length());
source.replace(reps, replacement);
Serial.printf("source#L13:%s(%d)\n", source.c_str(), source.length());
source.trim();
Serial.printf("source#L15:%s(%d)\n", source.c_str(), source.length());
}
void loop() {
}The above sketch successfully ended.
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