ESP32: Stack canary watchpoint triggered (nimble_host)

[vicatcu]

I'm randomly getting this shortly after writing a characteristic value:

Guru Meditation Error: Core  0 panic'ed (Unhandled debug exception). 
Debug exception reason: Stack canary watchpoint triggered (nimble_host)

My free RAM after Bluetooth initialization is complete and advertising is under way, using esp_get_free_heap_size() indicates there are 102672 bytes free...

At a bit of a loss as to what's happening. Any ideas on diagnostics would be appreciated.

[h2zero]

I suspect you are doing too much in your callbacks. You can either increase the nimble host task stack size or move your code out of the callbacks and just set a flag or trigger a task (preferred option).

[h2zero]

@vicatcu Any progress on this?

[lazd]

I suspect you are doing too much in your callbacks. You can either increase the nimble host task stack size or move your code out of the callbacks and just set a flag or trigger a task (preferred option).

I added the following platform.io build flags and it seemed to fix my issue, but I will report back if it happens again:

build_flags =
  -D ARDUINO_NIMBLE
  -D CONFIG_BT_NIMBLE_HOST_TASK_STACK_SIZE=6144

[h2zero]

Closing this as resolved.