ESP32 freezes when it restarts during WiFi.begin or WiFi.mode

[thehellmaker]

Hardware:

Board: ?ESP32 Dev Module?
Core Installation/update date: ?11/jul/2017?
IDE name: ?Arduino IDE?
Flash Frequency: ?40Mhz?
PSRAM enabled: ?no?
Upload Speed: ?115200?
Computer OS: ?Mac OSX?

Description:

I am using an ESP32 NodeMCU development board and using esp32-arduino using platformio. ESP32 hangs/freezes and watchdog doesn't restart the system in a peculiar case. Most of the times it restarts but in some peculiar case it freezes. What i have figured out is if the system restarts either in a timer or an interrupt while WiFi.begin is being called.

Sketch:

//Change the code below by your sketch
#include <Arduino.h>
#include "WiFi.h"
#include "esp_task_wdt.h"
#include "esp_int_wdt.h"
#include "esp32-hal.h"

static volatile long lastACMainsTimestamp = 0;
static volatile int current_count_ac[] = {0,0,0,0};

void IRAM_ATTR recordACInterrupt0() {
	ESP.restart();
	current_count_ac[0]++;
}

void setup() {
  enableLoopWDT();
  enableCore0WDT();
  enableCore1WDT();
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  pinMode(23, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(23), recordACInterrupt0, CHANGE);
  // Comment the below lines and it will never get stuck 
  WiFi.mode(WIFI_STA);
  WiFi.disconnect(true);
  WiFi.begin("ssid-test", "password-test");
}

void loop() {
}

Why am I calling ESP.restart() in an interrupt?

I have an esp32 in production used for SMART HOME usecase which stops responding and doesn't reset in a customer environment and i have to ask my customers to reset this by powering off the mains to their house and then powering it on which is almost an annoyance when it happens.

I have looked at all the related issues below and none solve it

1. esp_restart() intermittently won't reset, causing stuck esp32 (IDFGH-258) esp-idf#2101
2. DEEPSLEEP_RESET gets stuck after a few resets #796

So I did some monkey testing with restarts and tried to get the device into a state which doesn't reset automatically even when WDT is setup and I arrived at the following way where I restart in an interrupt simultaneously when WiFi.begin or WiFi.mode is being called.

How often does it happen?

It happens per customer every once in 2 weeks to a month. If not for this issue its completely stable

StackTrace

For the pin 23 I give a signal of 5Hz DC square wave so that it gets triggered every 200ms and after a few restarts in a some peculiar case it throws the below stacktrace and freezes completely

[E][esp32-hal-misc.c:87] enableCore0WDT(): Failed to add Core 0 IDLE task to WDT
Guru Meditation Error: Core  1 panic'ed (Cache disabled but cached memory region accessed)
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.

Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x4013b004: bad00bad bad00bad bad00bad
Guru Meditation Error: Core  1 panic'ed (IllegalGuru Meditation Error: Core  1 panic'ed (Unhandled debug exc
eption)
Debug exception reason: Stack canary watchpoint triggered (�@␜␛�?)
Guru Meditation Error: Core  1 panic'ed (Double exception)
Guru Meditation Error: Core  1 panic'ed (Double exception)
Guru Meditation Error: Core  1 panic'ed (Guru Meditation Error: Core  1 panic'ed (

[thehellmaker]

Related Issue: #2686

I am testing with disabling interrupt during WiFi connect as suggested by @atanisoft

[stale]

[STALE_SET] This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

[stale]

[STALE_DEL] This stale issue has been automatically closed. Thank you for your contributions.

[roysG]

CLOSED?!?!?!
This is a serious problem!

[atanisoft]

@roysG If you have a reproducible test case for this please open a new issue and it can be reviewed. If there is a bug in the arduino-esp32 code it can be fixed, if the bug is in your code someone will likely be able to provide advise on how to fix.

[VojtechBartoska]

Hello @roysG, yea, please raise new issue if needed.

Thanks for nice answer @atanisoft ;)