Guru Meditation Error of type LoadProhibited occurred on core 1

[mkaze]

I wanted to run a simple test of esp-mqtt library on a NodeMCU-ESP32 board. My code is largely based on wifi scan example in esp-idf. It tries to connect to an specified AP and after getting an IP, it attempts to connect to a mqtt broker and publish a message to a specific topic. But as soon as it wants to connect to mqtt broker, the chip gets rebooted and this scenario repeats again and again. Here is the code and the following is the monitor log:

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

rst:0xc (SW_CPU_RESET),boot:0x1b (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:3
load:0x3fff0010,len:4
load:0x3fff0014,len:5620
load:0x40078000,len:0
load:0x40078000,len:12476
entry 0x40078f74
W (73) rtc_clk: Bogus XTAL frequency: 0 MHz
I (33) boot: ESP-IDF v3.0-dev-899-g3a271a4a-dirty 2nd stage bootloader
I (34) boot: compile time 08:54:13
I (45) boot: Enabling RNG early entropy source...
I (46) boot: SPI Speed      : 26.7MHz
I (46) boot: SPI Mode       : DIO
I (48) boot: SPI Flash Size : 4MB
I (52) boot: Partition Table:
I (56) boot: ## Label            Usage          Type ST Offset   Length
I (63) boot:  0 nvs              WiFi data        01 02 00009000 00006000
I (71) boot:  1 phy_init         RF data          01 01 0000f000 00001000
I (78) boot:  2 factory          factory app      00 00 00010000 00100000
I (86) boot: End of partition table
I (90) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x0f338 ( 62264) map
I (124) esp_image: segment 1: paddr=0x0001f360 vaddr=0x3ffb0000 size=0x00cb0 (  3248) load
I (126) esp_image: segment 2: paddr=0x00020018 vaddr=0x400d0018 size=0x4edc0 (323008) map
0x400d0018: _stext at ??:?

I (262) esp_image: segment 3: paddr=0x0006ede0 vaddr=0x3ffb0cb0 size=0x0223c (  8764) load
I (266) esp_image: segment 4: paddr=0x00071024 vaddr=0x40080000 size=0x00400 (  1024) load
0x40080000: _iram_start at E:/My-Projects/esp/esp-idf/components/freertos/xtensa_vectors.S:167
5

I (269) esp_image: segment 5: paddr=0x0007142c vaddr=0x40080400 size=0x0f620 ( 63008) load
I (307) esp_image: segment 6: paddr=0x00080a54 vaddr=0x400c0000 size=0x00000 (     0) load
I (317) boot: Loaded app from partition at offset 0x10000
I (317) boot: Disabling RNG early entropy source...
I (319) cpu_start: Pro cpu up.
I (322) cpu_start: Starting app cpu, entry point is 0x40080e8c
0x40080e8c: call_start_cpu1 at E:/My-Projects/esp/esp-idf/components/esp32/cpu_start.c:219

I (312) cpu_start: App cpu up.
I (333) heap_init: Initializing. RAM available for dynamic allocation:
I (340) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (346) heap_init: At 3FFB88F8 len 00027708 (157 KiB): DRAM
I (352) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (359) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (365) heap_init: At 4008FA20 len 000105E0 (65 KiB): IRAM
I (371) cpu_start: Pro cpu start user code
I (54) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (120) wifi: wifi firmware version: 7bd4899
I (120) wifi: config NVS flash: enabled
I (120) wifi: config nano formating: disabled
I (120) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (130) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (170) wifi: Init dynamic tx buffer num: 32
I (170) wifi: Init data frame dynamic rx buffer num: 32
I (170) wifi: Init management frame dynamic rx buffer num: 32
I (180) wifi: wifi driver task: 3ffc529c, prio:23, stack:4096
I (180) wifi: Init static rx buffer num: 10
I (180) wifi: Init dynamic rx buffer num: 32
I (190) wifi: Init rx ampdu len mblock:7
I (190) wifi: Init lldesc rx ampdu entry mblock:4
I (200) wifi: wifi power manager task: 0x3ffca708 prio: 21 stack: 2560
I (230) phy: phy_version: 359.0, e79c19d, Aug 31 2017, 17:06:07, 0, 0
I (230) wifi: mode : sta (24:0a:c4:06:62:7c)
I (230) scan: SYSTEM_EVENT_STA_START
I (2640) wifi: n:7 0, o:1 0, ap:255 255, sta:7 0, prof:1
I (3630) wifi: state: init -> auth (b0)
I (3640) wifi: state: auth -> assoc (0)
I (3650) wifi: state: assoc -> run (10)
I (3660) wifi: connected with My Network, channel 7
I (5080) event: ip: 192.168.1.35, mask: 255.255.255.0, gw: 192.168.1.1
I (5080) scan: SYSTEM_EVENT_STA_GOT_IP
I (5080) scan: got ip:192.168.1.35

I (5080) esp_mqtt: esp_mqtt_start: create task
I (5090) esp_mqtt: esp_mqtt_publish: not connected
I (5090) esp_mqtt: esp_mqtt_process: begin connection attempt
Guru Meditation Error of type LoadProhibited occurred on core  1. Exception was unhandled.
Register dump:
PC      : 0x400014fd  PS      : 0x00060330  A0      : 0x80119411  A1      : 0x3ffbee00
A2      : 0x00000000  A3      : 0xfffffffc  A4      : 0x000000ff  A5      : 0x0000ff00
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x00000000  A9      : 0x3ffbeda0
A10     : 0x00000000  A11     : 0x7fffffff  A12     : 0x3ffcafd8  A13     : 0x3ffc150c
A14     : 0x00060123  A15     : 0xff000000  SAR     : 0x00000004  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000  LBEG    : 0x400014fd  LEND    : 0x4000150d  LCOUNT  : 0xffffffff

Backtrace: 0x400014fd:0x3ffbee00 0x4011940e:0x3ffbee10 0x40118d67:0x3ffbee40 0x40118df6:0x3ffbeeb0
0x4011940e: lwmqtt_string at E:/My-Projects/esp/esp-idf/components/esp-mqtt/lwmqtt/src/string.
c:7

0x40118d67: esp_mqtt_process_connect at E:/My-Projects/esp/esp-idf/components/esp-mqtt/esp_mqt
t.c:376

0x40118df6: esp_mqtt_process at E:/My-Projects/esp/esp-idf/components/esp-mqtt/esp_mqtt.c:376

[256dpi]

Thanks for reporting this! I found some issues regarding some strings beeing NULL in the underlying library. I released a new version that should resolve it. Can you give it a test?

[mkaze]

@256dpi Thank you very much! I tested it again and now it's fully working. I'm closing this issue since it's resolved.

[eldadwasserman]

I have the same error with the OTA example... anyone can help ?

[256dpi]

Can you share the code?

[mkaze]

@eldadwasserman First, make sure you have pulled the latest commits. Go to components/esp-mqtt and run git pull and git submodule update --init --recursive. Then build your project again and see if it is working properly or not.