The example of 'CaptivePortal' crashed my ESP on connect #4222

jellewie · 2020-08-03T15:26:32Z

Hardware:

Board: DOIT ESP32 DEVKIT V1, default settings
Core Installation version: 1.0.4
IDE name: Arduino EDE 1.8.9
Flash Frequency: default settings
PSRAM enabled: default settings
Upload Speed: 921600
Computer OS: Windows 10

Description:

Example of CaptivePortal crashed the ESP

Steps to replicate

Uploaded the example CaptivePortal sketch (both the 1.0.4 version and the one on github do not work)
Try to connect with the AP with an (android) device
ESP panic'd and rebooted (loop back to step 2 and repeat until you are tired...)

What I expected

That the example sketch does not crash when a device connects to it.
and that the DNS server will redirect you as it suppose to

Sketch:

arduino-esp32/libraries/DNSServer/examples/CaptivePortal/CaptivePortal.ino

#include <DNSServer.h>

const byte DNS_PORT = 53;
IPAddress apIP(192, 168, 1, 1);
DNSServer dnsServer;
WiFiServer server(80);

String responseHTML = ""
  "<!DOCTYPE html><html><head><title>CaptivePortal</title></head><body>"
  "<h1>Hello World!</h1><p>This is a captive portal example. All requests will "
  "be redirected here.</p></body></html>";

void setup() { 
  WiFi.disconnect();   //added to start with the wifi off, avoid crashing
  WiFi.mode(WIFI_OFF); //added to start with the wifi off, avoid crashing
  WiFi.mode(WIFI_AP);
  WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));
  WiFi.softAP("DNSServer CaptivePortal example");

  // if DNSServer is started with "*" for domain name, it will reply with
  // provided IP to all DNS request
  dnsServer.start(DNS_PORT, "*", apIP);

  server.begin();
}

void loop() {
  dnsServer.processNextRequest();
  WiFiClient client = server.available();   // listen for incoming clients

  if (client) {
    String currentLine = "";
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        if (c == '\n') {
          if (currentLine.length() == 0) {
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println();
            client.print(responseHTML);
            break;
          } else {
            currentLine = "";
          }
        } else if (c != '\r') {
          currentLine += c;
        }
      }
    }
    client.stop();
  }
}

Debug Messages:

Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here

Crash error

`rst:0xc (SW_CPU_RESET),boot:0x13 (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:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac
Guru Meditation Error: Core 0 panic'ed (InstrFetchProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x00000000 PS : 0x00060030 A0 : 0x8010feb1 A1 : 0x3ffb3b40
A2 : 0x3ffcc8a4 A3 : 0x3ffcbfe8 A4 : 0x3ffcb744 A5 : 0x3ffcb724
A6 : 0x0201a8c0 A7 : 0x0c01a8c0 A8 : 0x8010fd54 A9 : 0x3ffb3b00
A10 : 0x3ffcc8b4 A11 : 0x3ffcbfe8 A12 : 0x3ffb3b4c A13 : 0x00000044
A14 : 0x00000001 A15 : 0x00000006 SAR : 0x00000010 EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000 LBEG : 0x4000c349 LEND : 0x4000c36b LCOUNT : 0x00000000

Backtrace: 0x00000000:0x3ffb3b40 0x4010feae:0x3ffb3b80 0x4011cd35:0x3ffb3ba0 0x40121d3d:0x3ffb3be0 0x40126fda:0x3ffb3c00 0x401108b7:0x3ffb3c20 0x400886e1:0x3ffb3c50`

=====DECODED
PC: 0x00000000
EXCVADDR: 0x00000000

Decoding stack results
0x4010feae: handle_dhcp at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/apps/dhcpserver/dhcpserver.c line 1031
0x4011cd35: udp_input at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/core/udp.c line 401
0x40121d3d: ip4_input at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/core/ipv4/ip4.c line 740
0x40126fda: ethernet_input at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/netif/ethernet.c line 184
0x401108b7: tcpip_thread at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/lwip/lwip/src/api/tcpip.c line 135
0x400886e1: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

The text was updated successfully, but these errors were encountered:

lbernstone · 2020-08-03T15:54:52Z

#4080

jellewie · 2020-08-03T16:20:37Z

If I change the IP to the ESP default IP
IPAddress apIP(192, 168, 4, 1);

and uncomment the softApConfig
//WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));

then it does work on Android and Windows (at least seems to)

#4080
About your pull request, here is some feedback (mind I have not tried the code itself)
-SSID can contain spaces
-Furthermore, I also don't really like you removed the 'disconnect' and 'WIFI_OFF' code from it, any reason why?
-Moreover, I find it a stupid idea to change the DNS to the default android DNS, we can be less platform-specific?

stale · 2020-10-03T04:26:06Z

[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.

jellewie · 2020-10-03T13:24:25Z

Ow damm, do I need to write a bot again to keep a ticket open?

stale · 2020-10-03T13:24:28Z

[STALE_CLR] This issue has been removed from the stale queue. Please ensure activity to keep it openin the future.

stale · 2020-12-03T06:01:44Z

[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.

jellewie · 2020-12-03T08:29:10Z

This issue seems to always occur om some ESP32, But not on others. Have not been able to prove this and such, but it might be some hardware version issue or so?

stale · 2020-12-03T08:29:12Z

[STALE_CLR] This issue has been removed from the stale queue. Please ensure activity to keep it openin the future.

lvlira · 2021-01-01T17:31:38Z

In my case, the CaptivePortal code in the "DNSServer" lib works in Arduino IDE 1.8.13. However, when I create a project in VSCode with this code, the error reported by jellewie occurs.

Task: Trying run the CaptivePortal code using VSCode

System:
VSCode version: 1.52.1
Commit: ea3859d4ba2f3e577a159bc91e3074c5d85c0523
Date: 2020-12-16T16:32:10.090Z
Electron: 9.3.5
Chrome: 83.0.4103.122
Node.js: 12.14.1
V8: 8.3.110.13-electron.0
OS: Linux x64 5.4.0-58-generic
PlatformIO: 1.319.687
C++ (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

Board: esp-wrover-kit

Problem (only VSCode with PlatformIO) : Guru Meditation Error After uploading the code to ESP32 and trying to connect to the wifi network using a Android 8.0 smartphone

Main.cpp:
#include <WiFi.h>
#include <DNSServer.h>

const byte DNS_PORT = 53;
IPAddress apIP(8,8,4,4); // The default android DNS
DNSServer dnsServer;
WiFiServer server(80);

String responseHTML = ""
"<title>CaptivePortal</title>"
"

Hello World!

This is a captive portal example. All requests will "
"be redirected here.

";

void setup() {

WiFi.mode(WIFI_AP);
WiFi.softAP("ESP32-DNSServer");
WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));

// if DNSServer is started with "" for domain name, it will reply with
// provided IP to all DNS request
dnsServer.start(DNS_PORT, "", apIP);

server.begin();
}

void loop() {
dnsServer.processNextRequest();
WiFiClient client = server.available(); // listen for incoming clients

if (client) {
String currentLine = "";
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (c == '\n') {

      if (currentLine.length() == 0) {
        client.println("HTTP/1.1 200 OK");
        client.println("Content-type:text/html");
        client.println();
        client.print(responseHTML);
        break;
      } else {
        currentLine = "";
      }
    } else if (c != '\r') {
      currentLine += c;
    }
  }
}
client.stop();

}
}

PLATFORMIO.INI:
[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200

ERROR MESSAGE:
ets Jun 8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (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:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac
dhcps: send_offer>>udp_sendto result 0
Guru Meditation Error: Core 0 panic'ed (InstrFetchProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x00000000 PS : 0x00060e30 A0 : 0x80110781 A1 : 0x3ffb3b40
A2 : 0x3ffcbe3c A3 : 0x3ffcc070 A4 : 0x3ffcc9c8 A5 : 0x3ffcc9a8
A6 : 0x05040808 A7 : 0x0f040808 A8 : 0x80110624 A9 : 0x3ffb3b00
A10 : 0x3ffcbe4c A11 : 0x3ffcc070 A12 : 0x3ffb3b4c A13 : 0x00000044
A14 : 0x00000001 A15 : 0x00000006 SAR : 0x00000010 EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000 LBEG : 0x4000c349 LEND : 0x4000c36b LCOUNT : 0x00000000

Backtrace: 0x00000000:0x3ffb3b40 0x4011077e:0x3ffb3b80 0x4011d605:0x3ffb3ba0 0x4012260d:0x3ffb3be0 0x401278aa:0x3ffb3c00 0x40111187:0x3ffb3c20 0x400886e1:0x3ffb3c50

Rebooting...
ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (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:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac

lvlira · 2021-01-09T13:43:46Z

In my case, the CaptivePortal code in the "DNSServer" lib works in Arduino IDE 1.8.13. However, when I create a project in VSCode with this code, the error reported by jellewie occurs.

Task: Trying run the CaptivePortal code using VSCode

System:
VSCode version: 1.52.1
Commit: ea3859d4ba2f3e577a159bc91e3074c5d85c0523
Date: 2020-12-16T16:32:10.090Z
Electron: 9.3.5
Chrome: 83.0.4103.122
Node.js: 12.14.1
V8: 8.3.110.13-electron.0
OS: Linux x64 5.4.0-58-generic
PlatformIO: 1.319.687
C++ (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

Board: esp-wrover-kit

Problem (only VSCode with PlatformIO) : Guru Meditation Error After uploading the code to ESP32 and trying to connect to the wifi network using a Android 8.0 smartphone

Main.cpp:
#include <WiFi.h>
#include <DNSServer.h>

const byte DNS_PORT = 53;
IPAddress apIP(8,8,4,4); // The default android DNS
DNSServer dnsServer;
WiFiServer server(80);

String responseHTML = ""
"<title>CaptivePortal</title>"
"

Hello World!

This is a captive portal example. All requests will "
"be redirected here.
";

void setup() {

WiFi.mode(WIFI_AP);
WiFi.softAP("ESP32-DNSServer");
WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));

// if DNSServer is started with "" for domain name, it will reply with // provided IP to all DNS request dnsServer.start(DNS_PORT, "", apIP);

server.begin();
}

void loop() {
dnsServer.processNextRequest();
WiFiClient client = server.available(); // listen for incoming clients

if (client) {
String currentLine = "";
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (c == '\n') {
      if (currentLine.length() == 0) {
        client.println("HTTP/1.1 200 OK");
        client.println("Content-type:text/html");
        client.println();
        client.print(responseHTML);
        break;
      } else {
        currentLine = "";
      }
    } else if (c != '\r') {
      currentLine += c;
    }
  }
}
client.stop();
}
}

PLATFORMIO.INI:
[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200

ERROR MESSAGE:
ets Jun 8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (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:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac
dhcps: send_offer>>udp_sendto result 0
Guru Meditation Error: Core 0 panic'ed (InstrFetchProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x00000000 PS : 0x00060e30 A0 : 0x80110781 A1 : 0x3ffb3b40
A2 : 0x3ffcbe3c A3 : 0x3ffcc070 A4 : 0x3ffcc9c8 A5 : 0x3ffcc9a8
A6 : 0x05040808 A7 : 0x0f040808 A8 : 0x80110624 A9 : 0x3ffb3b00
A10 : 0x3ffcbe4c A11 : 0x3ffcc070 A12 : 0x3ffb3b4c A13 : 0x00000044
A14 : 0x00000001 A15 : 0x00000006 SAR : 0x00000010 EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000 LBEG : 0x4000c349 LEND : 0x4000c36b LCOUNT : 0x00000000

Backtrace: 0x00000000:0x3ffb3b40 0x4011077e:0x3ffb3b80 0x4011d605:0x3ffb3ba0 0x4012260d:0x3ffb3be0 0x401278aa:0x3ffb3c00 0x40111187:0x3ffb3c20 0x400886e1:0x3ffb3c50

Rebooting...
ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (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:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac

Solved!

I put a 2s delay to allow the softAP command to stabilize.
WiFi.softAP("ESP32-DNSServer");
delay(2000);
WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));

stale · 2021-06-22T17:50:08Z

[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 · 2021-07-08T02:00:56Z

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

zekageri · 2022-09-02T08:22:41Z

Still happens

VojtechBartoska · 2022-09-02T11:53:38Z

@zekageri tested on 2.0.4?

zekageri · 2022-09-02T13:08:09Z

@zekageri tested on 2.0.4?

Processing esp-wrover-kit (platform: espressif32; board: esp-wrover-kit; framework: arduino)
------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/espressif32/esp-wrover-kit.html
PLATFORM: Espressif 32 (5.1.1) > Espressif ESP-WROVER-KIT
HARDWARE: ESP32 240MHz, 320KB RAM, 4MB Flash
DEBUG: Current (ftdi) On-board (ftdi) External (cmsis-dap, esp-bridge, esp-prog, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, 
olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa)
PACKAGES:
 - framework-arduinoespressif32 @ 3.20004.220825 (2.0.4)
 - tool-esptoolpy @ 1.30300.0 (3.3.0)
 - toolchain-xtensa-esp32 @ 8.4.0+2021r2-patch3
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft

framework is 2.0.4 yes.

vortigont · 2022-12-11T12:58:57Z

You may try updated Captive Portal example from DNSServerAsync lib.
Could also be easily adopted to bundled DNSServer lib.

zekageri · 2022-12-11T15:20:46Z

I will give it a try. Hope it works with Async we server by me_no_dev

zekageri · 2022-12-11T15:34:19Z

You may try updated Captive Portal example from DNSServerAsync lib. Could also be easily adopted to bundled DNSServer lib.

First try

assert failed: tcp_update_rcv_ann_wnd IDF/components/lwip/lwip/src/core/tcp.c:951 (new_rcv_ann_wnd <= 0xffff)


Backtrace:0x40083cbd:0x3ffb55c00x4008ece5:0x3ffb55e0 0x40094509:0x3ffb5600 0x4011ba5e:0x3ffb5730 0x4011bb0c:0x3ffb5750 0x40186042:0x3ffb5770 0x40118398:0x3ffb5790 

  #0  0x40083cbd:0x3ffb55c0 in panic_abort at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/esp_system/panic.c:402      
  #1  0x4008ece5:0x3ffb55e0 in esp_system_abort at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/esp_system/esp_system.c:128
  #2  0x40094509:0x3ffb5600 in __assert_func at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/newlib/assert.c:85        
  #3  0x4011ba5e:0x3ffb5730 in tcp_update_rcv_ann_wnd at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp.c:951
      (inlined by) tcp_update_rcv_ann_wnd at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp.c:931 
  #4  0x4011bb0c:0x3ffb5750 in tcp_recved at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp.c:991 
  #5  0x40186042:0x3ffb5770 in _tcp_recved_api(tcpip_api_call_data*) at lib/AsyncTCP/src/AsyncTCP.cpp:431
  #6  0x40118398:0x3ffb5790 in tcpip_thread_handle_msg at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/api/tcpip.c:172
      (inlined by) tcpip_thread at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/api/tcpip.c:154




ELF file SHA256: 0000000000000000

Rebooting...

vortigont · 2022-12-11T15:43:27Z

@zekageri are you sure you've build and example from DNSServerAsync?

In your trace there is an AsyncTCP call. That example does not use AsyncTCP lib.

#5  0x40186042:0x3ffb5770 in _tcp_recved_api(tcpip_api_call_data*) at lib/AsyncTCP/src/AsyncTCP.cpp:431
      (inlined by) tcpi

zekageri · 2022-12-11T15:43:51Z

I had only this handler:

captiveSerer.on("/", HTTP_GET, [this](AsyncWebServerRequest *request) {
    AsyncWebServerResponse *response =  request->beginResponse(
        LittleFS,
        WELCOME_PAGE_PATH,
        sGlobal.getMimeType(WELCOME_PAGE_PATH)
    );
    request->send(response);
});

I added /portal endpoint as in the example, it seems much more stable now.
I have two endpoint now:

captiveSerer.on("/", HTTP_GET, [this](AsyncWebServerRequest *request) {
    AsyncWebServerResponse *response =  request->beginResponse(
        LittleFS,
        WELCOME_PAGE_PATH,
        sGlobal.getMimeType(WELCOME_PAGE_PATH)
    );
    request->send(response);
});

captiveSerer.on("/portal", HTTP_GET, [this](AsyncWebServerRequest *request) {
    AsyncWebServerResponse *response =  request->beginResponse(
        LittleFS,
        WELCOME_PAGE_PATH,
        sGlobal.getMimeType(WELCOME_PAGE_PATH)
    );
    request->send(response);
});

Will test it further.

zekageri · 2022-12-11T15:44:14Z

@zekageri are you sure you've build and example from DNSServerAsync?

In your trace there is an AsyncTCP call. That example does not use AsyncTCP lib.
#5  0x40186042:0x3ffb5770 in _tcp_recved_api(tcpip_api_call_data*) at lib/AsyncTCP/src/AsyncTCP.cpp:431
      (inlined by) tcpi

But i use it

zekageri · 2022-12-11T15:45:43Z

Maybe the crashes are all the Async TCP's fault? hmm

CORRUPT HEAP: Bad head at 0x3ffd8780. Expected 0xabba1234 got 0x3ffcb0cc

assert failed: multi_heap_free multi_heap_poisoning.c:253 (head != NULL)


Backtrace:0x40083cbd:0x3ffb55b00x4008ece5:0x3ffb55d0 0x40094509:0x3ffb55f0 0x40094133:0x3ffb5720 0x40084151:0x3ffb5740 0x40094539:0x3ffb5760 0x40119ac7:0x3ffb5780 0x40119b23:0x3ffb57a0 0x40119b57:0x3ffb57c0 0x4011b571:0x3ffb57e0 0x4011c632:0x3ffb5800 0x4011c6d7:0x3ffb5830 0x401860ba:0x3ffb5850 0x40118334:0x3ffb5870 

  #0  0x40083cbd:0x3ffb55b0 in panic_abort at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/esp_system/panic.c:402      
  #1  0x4008ece5:0x3ffb55d0 in esp_system_abort at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/esp_system/esp_system.c:128
  #2  0x40094509:0x3ffb55f0 in __assert_func at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/newlib/assert.c:85        
  #3  0x40094133:0x3ffb5720 in multi_heap_free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/heap/multi_heap_poisoning.c:253
      (inlined by) multi_heap_free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/heap/multi_heap_poisoning.c:245     
  #4  0x40084151:0x3ffb5740 in heap_caps_free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/heap/heap_caps.c:340     
  #5  0x40094539:0x3ffb5760 in free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/newlib/heap.c:39
  #6  0x40119ac7:0x3ffb5780 in mem_free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/mem.c:264 (discriminator 2)
  #7  0x40119b23:0x3ffb57a0 in do_memp_free_pool at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/memp.c:383
  #8  0x40119b57:0x3ffb57c0 in memp_free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/memp.c:440 
  #9  0x4011b571:0x3ffb57e0 in tcp_free at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp.c:216 (discriminator 2)
  #10 0x4011c632:0x3ffb5800 in tcp_close_shutdown at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp.c:370
  #11 0x4011c6d7:0x3ffb5830 in tcp_close at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp.c:498 (discriminator 1)
  #12 0x401860ba:0x3ffb5850 in _tcp_close_api(tcpip_api_call_data*) at lib/AsyncTCP/src/AsyncTCP.cpp:452
  #13 0x40118334:0x3ffb5870 in tcpip_thread_handle_msg at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/api/tcpip.c:172
      (inlined by) tcpip_thread at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/api/tcpip.c:154




ELF file SHA256: 0000000000000000

Rebooting...

zekageri · 2022-12-11T15:48:44Z

So far the captive portal itself is working on android and windows. It pops up the webpage with Async Webserver too. And the crashes are much fewer than before.

Will test it with IOS

vortigont · 2022-12-11T15:52:58Z

But i use it

Looks like you have lot's of other things like littlefs and not sure what is sGlobal.getMimeType(WELCOME_PAGE_PATH). There could be lot's of places to hit a dangling pointer when using AsyncWebserver.
My humble advise is to replace page content and type with static "char-something" and test this way to mitigate any dependent code.
Captive portal reqs should be really really fast served due to modern devices generates tons of parallel requests for new wifi connection.

zekageri · 2022-12-11T15:57:37Z

Yes, i use LittleFS to serve webpages from the file system.

sGlobal.getMimeType(WELCOME_PAGE_PATH) will determine a correct mime type for a given file, nothing much just a couple of if statements.

I use captive portal for first configuration. The user will post a config object with HTTP_POST.
I use async webserver because it has a really powerfull websocket and event handling system which all happens at the same port as the webserver part. It is necessary for me.

vortigont · 2022-12-11T16:27:54Z

@zekageri I understand, but here discussing an issue with "CaptivePortal example" not "I have a project with async server, littlefs + something" and it fails. Pls, do not consider me being rude, just trying to narrow down the issue. Suspect that the root cause for an old example is that WiFiServer can't handle multiple concurrent tcp sessions which happens with captive portal when lot's of req's are redirected by DNSServer. An updated example could stand a better chance (or not).

sGlobal.getMimeType(WELCOME_PAGE_PATH) will determine a correct mime type for a given file, nothing much just a couple of if statements.

so suppose it would not be a problem to stub it with const char* strings and test if it helps here or not, right?
Isolate the problem and reduce the complexity is a way to go when troubleshooting. Otherwise you maybe looking for an issue in a wrong place. Looking into stack trace a crash is somewhere on attempt to release a heap resource. Either mem region is corrupted or reference is wrong for some dynamically allocated object.
Cheers!

zekageri · 2022-12-11T16:35:17Z

@vortigont Thank you for the positive feedback. I appreciate.

I understand that, but this issue only happens on captive portal and nowhere else in my code. I have literally hundreads of endpoints using this exact same model with Async webserver and littlefs and getMimeType and such things. I have an admin page where the page has a concurrent request more than 15. I know i have to narrow down the problem, but this is the narrowed down part. I suspect that the problem will be somewhere in lwip because most of the error's content are related to it in some way.

If my code runs without captive portal it works in every imaginable mode. I'm also using ethernet and wifi and AP mode. In every case it is stable, except at captive portal connection. And this snippet is nowhere near the complexity of my any other frequently used endpoints.

PilnyTomas · 2023-01-19T10:19:12Z

I tried the example on the latest version of Arduino-esp32 with ESP32 and an android phone and it works for me.
Could you please retest it on the current version?
If it does not work, please tell us more about your setup.
If it works, please close the issue.

zekageri · 2023-02-14T19:12:22Z

Looks good to me so far.

jellewie mentioned this issue Sep 10, 2020

CaptivePortal jellewie/Arduino-Smart-light#28

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MicrodigitElettronica mentioned this issue Nov 26, 2021

crash on AP connection prampec/IotWebConf#229

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zekageri mentioned this issue Feb 23, 2023

Crash on captive portal connection #7354

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The example of 'CaptivePortal' crashed my ESP on connect #4222

The example of 'CaptivePortal' crashed my ESP on connect #4222

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The example of 'CaptivePortal' crashed my ESP on connect #4222

The example of 'CaptivePortal' crashed my ESP on connect #4222

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jellewie commented Aug 3, 2020

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