I encountered the same problem and found, that a buffer allocated and passed to esp_err_t esp_netif_receive(esp_netif_t *esp_netif, void *buffer, size_t len, void *eb) will never be freed, even though you specify a driver_free_rx_buffer callback. I found out by try and error (no documentation found)...

Hello I am using ESP-IDF 4.3 and need to evaluate the error reason for some library functions (such as for example "read()") by checking the value of "errno". However, it seems that the errno variable is not thread safe and could report a wrong value set by another task. I thought about putting the ...