Hard fault after 1.5 hours of co2 monitoring

[tudorapo]

CircuitPython version and board name

Adafruit CircuitPython 9.2.8 on 2025-05-28; Raspberry Pi Pico W with rp2040
Board ID:raspberry_pi_pico_w
UID:E6632C85930F4136
MAC:2C:CF:67:08:08:49

Code/REPL

import time
import board
import busio
import wifi
import sys
import gc
import supervisor
import traceback
import adafruit_scd4x
import adafruit_requests
import adafruit_connection_manager
from os import getenv

i2c0 = busio.I2C(board.GP17, board.GP16)
scd4x = adafruit_scd4x.SCD4X(i2c0)
scd4x.start_periodic_measurement()

print("wifi")
wifi.radio.hostname="co2"
try:
    wifi.radio.connect(ssid=getenv("WIFI"), password=getenv("PASS"))
except OSError as e:
    print(f"wifi: {e}")
radio = wifi.radio

if not radio.connected:
    print("No wifi, sad.")
    time.sleep(5)
    supervisor.reload()

pool = adafruit_connection_manager.get_radio_socketpool(radio)
ssl_context = adafruit_connection_manager.get_radio_ssl_context(radio)
requests = adafruit_requests.Session(pool, ssl_context)

print("Waiting for first measurement....")
while True:
    while not scd4x.data_ready:
        time.sleep(0.1)
    co2 = scd4x.CO2
    temp = scd4x.temperature
    hum = scd4x.relative_humidity
    urls = []
    urls.append(f'http://{getenv("SERV")}/templog/add/{getenv("NAME")}/co2/{co2}')
    urls.append(f'http://{getenv("SERV")}/templog/add/{getenv("NAME")}/temp/{temp}')
    urls.append(f'http://{getenv("SERV")}/templog/add/{getenv("NAME")}/hum/{hum}')
    for url in urls:
        try:
            r = requests.get(url, timeout=15)
        except Exception as e:
            print("Unexpected error:", traceback.format_exception(e))
            time.sleep(5)
            supervisor.reload()
        else:
            print(r.status_code)
    del urls
    msg = f"CO2: {co2:d} ppm\n"
    msg += f"Temp: {temp:.1f}C\n"
    msg += f"Humidity: {hum:.0f}%"
    print(msg)
    del msg
    print(gc.mem_free())
    time.sleep(30)

Behavior

It works quite well for 1.5 hours, and then:

CO2: 2226 ppm
Temp: 25.1C
Humidity: 62%
171120
200
200
200
CO2: 2223 ppm
Temp: 25.0C
Humidity: 63%
169504
200
200
Unexpected error: ['Traceback (most recent call last):\r\n  File "code.py", line 48, in <module>\r\n  File "adafruit_requests.py", line 721, in get\r\n  File "adafruit_requests.py", line 649, in request\r\n  File "adafruit_connection_manager.py", line 331, in get_socket\r\n  File "adafruit_connection_manager.py", line 248, in _get_connected_socket\r\nOSError: [Errno 119] EINPROGRESS\n']

Code done running.

[15:42:49.153] Disconnected
[15:42:50.154] Warning: Could not open /dev/ttyACM0 (No such file or directory)
[15:42:50.154] Waiting for tty device..
[15:42:52.158] Connected to /dev/ttyACM0
Auto-reload is off.
Running in safe mode! Not running saved code.

You are in safe mode because:
CircuitPython core code crashed hard. Whoops!
Hard fault: memory access or instruction error.
Please file an issue with your program at github.com/adafruit/circuitpython/issues.
Press reset to exit safe mode.

Press any key to enter the REPL. Use CTRL-D to reload.

Adafruit CircuitPython 9.2.8 on 2025-05-28; Raspberry Pi Pico W with rp2040

Description

I added some dels and gc info to the output hoping that its a problem of running out of memory, but no.

After I remove the usb and plug it back it comes back in firmware load mode, ie. the RPI-RP2 disk is mounted.

Tried it with the 10.0.0.beta3 too, same problem.

Additional information

It said that I have to open this.

[bablokb]

Strangely, I also have similar problems with SCD4x-CO2-monitoring. But I only log the data locally, no wifi involved and it takes much longer until it crashes. It could be a coincidence though. I "solved" it by auto restarting the Pico every two hours. This is not my normal use-case anyhow and so I did not follow up on the error.

[tudorapo]

Thanks, @bablokb , I feel less ashamed then. With a gregarious application of microcontroller.on_next_reset() my stuff restart nicely now. The bug still remains, of course.

[tannewt]

Note we now have a safemode.py too: https://learn.adafruit.com/circuitpython-safe-mode You can then log and restart after the safe mode.

[tudorapo]

Indeed, I read about that and created a safemode.py, thank you for making it part of the record. I have not seen running it yet, the on_next_reset seems to be enough yet. But the bug remains, and the little computer told me to file one, so here it is. I try to do the bidding of our evil robot overlord larvae.