Stack overflow in task ble

[Jonas A]

Hi,

I use a ESP32 WROVER and run IDF 4.4.3.
The device is setup as BLE central and peripheral.
If the device connects to a peripheral and the peripheral sends more than 150 bytes in a notification (frame will be fragmented)
the device crashes with this crashlog:

***ERROR*** A stack overflow in task ble has been detected.


Backtrace: 0x4008207a:0x3ffe6d00 0x40092995:0x3ffe6d20 0x40095ebe:0x3ffe6d40 0x400944f1:0x3ffe6dc0 0x40092a90:0x3ffe6df0 0x40092a42:0xa5a5a5a5 |<-CORRUPTED
0x4008207a: panic_abort at C:/repo/esp_4_4_3/components/esp_system/panic.c:402

0x40092995: esp_system_abort at C:/repo/esp_4_4_3/components/esp_system/esp_system.c:128

0x40095ebe: vApplicationStackOverflowHook at C:/repo/esp_4_4_3/components/freertos/port/xtensa/port.c:394

0x400944f1: vTaskSwitchContext at C:/repo/esp_4_4_3/components/freertos/tasks.c:3505

0x40092a90: _frxt_dispatch at C:/repo/esp_4_4_3/components/freertos/port/xtensa/portasm.S:436

0x40092a42: _frxt_int_exit at C:/repo/esp_4_4_3/components/freertos/port/xtensa/portasm.S:231



I've tested to increase the BLE task stack with 2000 bytes in the config menu but I get same error.
How can I solve this?

[ESP_Sprite]

Hard to say, I'm afraid. You can try to increase the stack by a bit more (2K is not much, try 16K or so), if that doesn't work it's likely something else like memory corruption.

[Jonas A]

What is the recommended size of the BLE task stack? We use both peripheral and central role.

[felixcollins]

You should set it large enough to not crash. Then, later in your project, if you need to regain the memory, look into the stack tools built into freertos. It is possible to run for a while exercising your code through all paths then dump the stack info and see how low each task got. If it gets closer to zero than a few hundred bytes, you are sailing close to the wind.