esp-idf: [Crash] [release/v4.4] LoadProhibited in esp_wifi/src/wifi_netif.c:110, when switching from STA to AP (IDFGH-7092)

ESP32-S3 ESP-IDF release/v4.4 (c29343eb94d2f2ca17b3a5b38c82452e556147f2) from a few days ago.

Been trying to get AP -> APSTA mode switching working. Hit a crash in ESP-IDF.

netif or esp_wifi does not appear to be cleaning up after itself correctly. See the logs. My Logs make it clear how I am calling ESP-IDF code.

Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

Core  0 register dump:
PC      : 0x42079352  PS      : 0x00060830  A0      : 0x82078c11  A1      : 0x3fcb58b0  
0x42079352: esp_wifi_get_if_mac at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_wifi/src/wifi_netif.c:110

A2      : 0x00000000  A3      : 0x3fcb58f6  A4      : 0x3fca5bbc  A5      : 0x00060823  
A6      : 0x00000001  A7      : 0x0000000c  A8      : 0x1873e946  A9      : 0x1873e946  
A10     : 0x00060823  A11     : 0x3fcb58f6  A12     : 0x00000001  A13     : 0x00060823  
A14     : 0x00060023  A15     : 0x00000003  SAR     : 0x00000017  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000008  LBEG    : 0x40056f5c  LEND    : 0x40056f72  LCOUNT  : 0x00000000  


Backtrace:0x4207934f:0x3fcb58b00x42078c0e:0x3fcb58e0 0x42078d19:0x3fcb5920 0x420f8679:0x3fcb5950 0x420f8d57:0x3fcb5990 0x420f8e36:0x3fcb59e0 0x40385b9a:0x3fcb5a10 
0x4207934f: esp_wifi_get_if_mac at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_wifi/src/wifi_netif.c:107

0x42078c0e: wifi_start at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_wifi/src/wifi_default.c:41

0x42078d19: wifi_default_action_sta_start at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_wifi/src/wifi_default.c:69

0x420f8679: handler_execute at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_event/esp_event.c:145

0x420f8d57: esp_event_loop_run at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_event/esp_event.c:598 (discriminator 3)

0x420f8e36: esp_event_loop_run_task at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/esp_event/esp_event.c:115 (discriminator 15)

0x40385b9a: vPortTaskWrapper at /Volumes/User/MBP-Google-Drive/jamcorder/firmware/esp-idf/components/freertos/port/xtensa/port.c:131


ELF file SHA256: 29e5e3aefec34919

I (7796) esp_core_dump_flash: Save core dump to flash...
I (7803) esp_core_dump_flash: Erase flash 36864 bytes @ 0xc000
I (8331) esp_core_dump_flash: Write end offset 0x87c4, check sum length 4
I (8331) esp_core_dump_flash: Core dump has been saved to flash.
CPU halted.

Logs:

I (61210) pd wifi: Entering STA Mode
I (2680) pd wifi: esp_netif_init()
I (2680) pd wifi: esp_event_loop_create_default()
I (2700) pd wifi: esp_netif_create_default_wifi_sta()
I (2700) pd wifi: esp_wifi_init()
I (2780) pd wifi: esp_event_handler_instance_register(ESP_EVENT_ANY_ID)
I (2790) pd wifi: esp_event_handler_instance_register(IP_EVENT_STA_GOT_IP)
I (2800) pd wifi: esp_wifi_set_mode(WIFI_MODE_STA)
I (2820) pd wifi: esp_wifi_set_config()
I (2820) pd wifi: esp_wifi_start()

I (61210) pd wifi: STA Mode Is Running
I (2910) pd wifi: Wifi Event: STA Mode - Start
I (2910) pd mdns: init
I (2930) pd api init: Starting HTTP Server
I (2950) pd wifi: Wifi Event: STA Mode - Connected
I (3680) pd wifi: IP Event: Station Mode - Got IP
I (3690) pd wifi: got ip: 192.168.0.180

I (61210) pd wifi: Stopping STA Mode
I (61220) pd wifi: esp_wifi_stop()
I (61220) pd wifi: Wifi Event: STA Mode - Disconnected
E (61220) pd wifi: Disconnect reason : (8) Assoc Leave
I (61240) pd wifi: Wifi Event: STA Mode - Stop
I (61260) pd wifi: esp_event_handler_instance_unregister(IP_EVENT_STA_GOT_IP)
I (61260) pd wifi: esp_event_handler_instance_unregister(ESP_EVENT_ANY_ID)
I (61270) pd wifi: esp_wifi_deinit()
I (61290) pd wifi: esp_netif_destroy(0x3fce2eb4)

I (61210) pd wifi: Entering AP Mode
I (61290) pd wifi: esp_netif_create_default_wifi_ap()
I (61300) pd wifi: esp_wifi_init()
I (61370) pd wifi: esp_event_handler_instance_register(ESP_EVENT_ANY_ID)
I (61370) pd wifi: esp_event_handler_instance_register(IP_EVENT_STA_GOT_IP)
I (61380) pd wifi: esp_wifi_set_mode(WIFI_MODE_APSTA)
I (61400) pd wifi: esp_wifi_set_config()
...crashed...

About this issue

Original URL
State: open
Created 2 years ago
Comments: 15 (11 by maintainers)

Most upvoted comments

Appreciate all the information.

If not an example, perhaps a dedicated documentation page on Wifi Switching? I hate to think all this useful information will be hard to find! It would be especially useful for newer users =) Wifi switching should be made easy!

For the original crash this issue was filed for, feel free to close this issue if you don’t think there is enough to go on. I think with code inspection there might be enough info to find it. It looks like a null dereference here:

esp_err_t esp_wifi_get_if_mac(wifi_netif_driver_t ifx, uint8_t mac[6])
{
    wifi_interface_t wifi_interface = ifx->wifi_if; // null deref

    return esp_wifi_get_mac(wifi_interface, mac);
}

Again, appreciate you helping! Launching a product this year =)

chipweinberger on Apr 6, 2022

Are you using esp_netif_new() when you’re switching ? They had a similar problem caused by esp_netif_init() when called mutliple times.

Arnaud-Oechslin on Apr 1, 2022