Exception 3 thrown during clear() or when destroying vectors - c++

Question

Description
Sometimes I get exception 3 when trying to clear() a std::vector.
Hardware
Hardware: ESP-07S
ESP8266-Arduino library core version: 2.4.0-rc1
Settings in IDE
Module: Generic ESP8266 Module
Flash Size: 4MB
CPU Frequency: 160Mhz
Flash Mode: qio
Flash Frequency: 40Mhz
Upload Using: OTA / SERIAL
Reset Method: ck
Stacktrace
This is stacktrace from Arduino's Exception Decoder:
Exception 3: LoadStoreError: Processor internal physical address or data error during load or store
Decoding 30 results
0x401000b7: umm_disconnect_from_free_list at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266\umm_malloc/umm_malloc.c line 1151
0x4021e9bc: memmove at /Users/igrokhotkov/e/newlib-xtensa/xtensa-lx106-elf/newlib/libc/string/../../../.././newlib/libc/string/memmove.c line 69 (discriminator 1)
0x40217464: Print::write(unsigned char const*, unsigned int) at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266/Print.cpp line 38
0x4010020c: _umm_free at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266\umm_malloc/umm_malloc.c line 1287
0x4010068c: free at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266\umm_malloc/umm_malloc.c line 1733
0x40215b04: operator delete(void*) at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266/abi.cpp line 57
0x40207940: std::_Vector_base >::_M_deallocate(double*, unsigned int) at C:\Users\Defozo\Documents\Arduino\jeszcze nowsza wersja laser_na_stacje_v2\laser_na_stacje_v2/laser_na_stacje_v2.ino line 565
0x402088ac: std::_Vector_base >::~_Vector_base() at c:\users\defozo\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2\xtensa-lx106-elf\include\c++\4.8.2\bits/stl_vector.h line 161
0x40209748: std::vector >::_M_erase_at_end(double*) at c:\users\defozo\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2\xtensa-lx106-elf\include\c++\4.8.2\bits/stl_vector.h line 1353
: (inlined by) std::vector >::clear() at c:\users\defozo\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2\xtensa-lx106-elf\include\c++\4.8.2\bits/stl_vector.h line 1126
: (inlined by) loop at C:\Users\Defozo\Documents\Arduino\jeszcze nowsza wersja laser_na_stacje_v2\laser_na_stacje_v2/laser_na_stacje_v2.ino line 412
0x40217082: std::default_delete ::operator()(TransportTraits*) const at c:\users\defozo\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2\xtensa-lx106-elf\include\c++\4.8.2\bits/unique_ptr.h line 68
0x4010020c: _umm_free at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266\umm_malloc/umm_malloc.c line 1287
0x401020ea: wDev_ProcessFiq at ?? line ?
0x40215d84: loop_wrapper at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266/core_esp8266_main.cpp line 124
0x4010070c: cont_norm at C:\Users\Defozo\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc1\cores\esp8266/cont.S line 109
This is reset cause:
Hardware Watchdog
Fatal exception:4 flag:1 (WDT) epc1:0x40000f83 epc2:0x00000000 epc3:0x4000dd3b excvaddr:0x40023c5c depc:0x00000000
Code
I'm initializing vectors like that:
std::vector<double> dhtTempVector, dhtHumidityVector;
std::vector<double> dhtTempMedianVector, dhtHumidityMedianVector;
std::vector<double> bmpTempVector, bmpPressureVector;
std::vector<double> bmpTempMedianVector, bmpPressureMedianVector;
dhtTempVector.reserve(5);
dhtHumidityVector.reserve(5);
bmpTempVector.reserve(5);
bmpPressureVector.reserve(5);
dhtTempMedianVector.reserve(6);
dhtHumidityMedianVector.reserve(6);
bmpPressureMedianVector.reserve(6);
bmpTempMedianVector.reserve(6);
Inserting new values like that:
if (!isnan(temp) && !isnan(hum)) {
dhtTempVector.push_back(temp);
dhtHumidityVector.push_back(hum);
}
and:
if (!dhtTempVector.empty()) {
dhtTempMedianVector.push_back(median(dhtTempVector));
dhtTempVector.clear();
}
if (!dhtHumidityVector.empty()) {
dhtHumidityMedianVector.push_back(median(dhtHumidityVector));
dhtHumidityVector.clear(); //line number 412
}
This is the median function:
double median(std::vector<double> v)
{
size_t n = v.size() / 2;
std::nth_element(v.begin(), v.begin()+n, v.end());
double vn = v[n];
if(v.size()%2 == 1) {
return vn;
} else {
std::nth_element(v.begin(), v.begin()+n-1, v.end());
return 0.5*(vn+v[n-1]);
}
}
Additional debug information
This is a result:
dhtTempVector size: 4
dhtTempMedianVector size: 5
dhtHumidityVector size: 4
dhtHumidityMedianVector size: 5
29.00 29.00 29.00 29.00 --
28.70 28.75 28.80 28.90 28.90 --
41.20 41.30 41.80 41.40 --
42.65 42.55 41.80 42.30 41.75 --
of these lines of code:
Serial.print("dhtTempVector size: ");
Serial.println(dhtTempVector.size());
Serial.print("dhtTempMedianVector size: ");
Serial.println(dhtTempMedianVector.size());
Serial.print("dhtHumidityVector size: ");
Serial.println(dhtHumidityVector.size());
Serial.print("dhtHumidityMedianVector size: ");
Serial.println(dhtHumidityMedianVector.size());
for (int k = 0; k < dhtTempVector.size(); ++k) {
Serial.print(dhtTempVector.at(k));
Serial.print(" ");
}
Serial.println("--");
for (int k = 0; k < dhtTempMedianVector.size(); ++k) {
Serial.print(dhtTempMedianVector.at(k));
Serial.print(" ");
}
Serial.println("--");
for (int k = 0; k < dhtHumidityVector.size(); ++k) {
Serial.print(dhtHumidityVector.at(k));
Serial.print(" ");
}
Serial.println("--");
for (int k = 0; k < dhtHumidityMedianVector.size(); ++k) {
Serial.print(dhtHumidityMedianVector.at(k));
Serial.print(" ");
}
Serial.println("--");
just before the exception is thrown.
Summary
It looks like the exception is thrown during clearing the vector. I think I experienced exceptions thrown at the end of the loop() function too - so at the time when destructors of the vectors are fired. I'd think it's a problem with destroying the elements of the vectors but they're just double numbers.
What could be the problem?
#Edit
The Arduino-ESP8266 library that I'm using is available here:
https://github.com/esp8266
Here is umm_malloc.c:
https://github.com/esp8266/Arduino/blob/master/cores/esp8266/umm_malloc/umm_malloc.c
Print.cpp:
https://github.com/esp8266/Arduino/blob/4897e0006b5b0123a2fa31f67b14a3fff65ce561/cores/esp8266/Print.cpp
cont.S:
https://github.com/esp8266/Arduino/blob/4897e0006b5b0123a2fa31f67b14a3fff65ce561/cores/esp8266/cont.S
Specific lines from umm_malloc.c:
1151:
UMM_NFREE(UMM_PFREE(c)) = UMM_NFREE(c);
https://github.com/esp8266/Arduino/blob/master/cores/esp8266/umm_malloc/umm_malloc.c#L1151
1287:
if( UMM_NBLOCK(UMM_PBLOCK(c)) & UMM_FREELIST_MASK ) {
https://github.com/esp8266/Arduino/blob/master/cores/esp8266/umm_malloc/umm_malloc.c#L1287
1733:
void umm_free( void *ptr ) {
ptr = GET_UNPOISONED(ptr);
/* check poison of each blocks, if poisoning is enabled */
if (!CHECK_POISON_ALL_BLOCKS()) {
return;
}
/* check full integrity of the heap, if this check is enabled */
if (!INTEGRITY_CHECK()) {
return;
}
_umm_free( ptr );
} //1733
https://github.com/esp8266/Arduino/blob/master/cores/esp8266/umm_malloc/umm_malloc.c#L1733
Specific line from Print.cpp:
size_t Print::write(const uint8_t *buffer, size_t size) {
size_t n = 0;
while(size--) {
n += write(*buffer++); //line number 38
}
return n;
}
https://github.com/esp8266/Arduino/blob/4897e0006b5b0123a2fa31f67b14a3fff65ce561/cores/esp8266/Print.cpp#L38
Specific line from core_esp8266_main.cpp:
static void loop_wrapper() {
static bool setup_done = false;
preloop_update_frequency();
if(!setup_done) {
setup();
#ifdef DEBUG_ESP_PORT
DEBUG_ESP_PORT.setDebugOutput(true);
#endif
setup_done = true;
}
loop();
run_scheduled_functions(); //line number 124
esp_schedule();
}
Line number 109 from cont.S:
https://github.com/esp8266/Arduino/blob/4897e0006b5b0123a2fa31f67b14a3fff65ce561/cores/esp8266/cont.S#L109