esp32 UDP socket bind()/recvfrom(): incoming empty packet crashes the system

I'm using the following image:

MicroPython v1.20.0-206-g33b403dfb-kaki5 on 2023-07-11; ESP32 CAMERA w/SSL (KAKI5) with ESP32 on an AiThinker ESP32-CAM.

When listening for incoming UDP packets, if the packet has a payload, everything works normally. If the packet is empty, instead of blocking, the receive loop begins looping very fast, receiving a bogus empty packet every time, which locks up the system.

Un-/comment MESSAGE="" after properly setting TARGET_IP in pc-tester.py (which is run from PC), and setting SSID and PASSWORD in notifications.py (which should be uploaded to mpy) to see the difference (you may also want to comment the wifi.ifconfig(...) line if using dynamic IP.

Notice the timestamps in the picture. For wrong.png, the timestamps are way too close, even though pc-tester.py is only sending once per second. The top picture is the wrong case, the bottom one is the correct case, when the udp packet has the payload foo. In the wrong case, the IP and port are then also reported incorrectly.

Is this a bug, or am I not paying attention to some quirk?

pc-tester.py.txt
notifications.py.txt

Inizia eseguendo pc-tester.py e notifications.py con MESSAGE vuoto e con un payload, usando la configurazione ESP32-CAM descritta nell’issue. Confronta la temporizzazione del ciclo di ricezione e l’IP e la porta riportati; il lavoro è completato quando i pacchetti UDP vuoti non causano più un ciclo di ricezione rapido e anomalo né il blocco del sistema.