I think I found a very odd memory issue triggering hard lock

[GM-Script-Writer-62850]

i have been having a nightmare of a time trying to use my DHT22s with my W5500 PICO boards and i think i may have actually found a workaround to whatever is going on

if i do not run gc.collect right after i measure() a DHT22 i have a chance of a hard lock, no errors a hard lock, some times i get 0 actions after sometimes i get ~70, but it is only a matter of time till it goes down
edit: well it still breaks, testing something that is not 100% reproducible is such a PITA

i even tried disabling the network while using measure() and it still crashes

Related bug reports i have made:

• W5500 Driver is extremely unstable (It is proof of concept quality) #11974
• DHT measure() locks up (core0) when _thread is running (core1) if WIZNET5K networking is enabled #10448

from machine import Pin
from time import sleep
from dht import DHT22
import _thread
from threadsafe import Message
import urequest # https://github.com/micropython/micropython-lib/issues/546
import network
import uasyncio
from gc import collect

print("Hello World")

nic=network.WIZNET5K()
nic.active(True)
err=1
while err:
	try:
		nic.ifconfig("dhcp")
		err=0
	except Exception as e:
		print("Network error:",e)
cfg=nic.ifconfig()
print("Network:",cfg)

Pin(7, Pin.OUT, value=1)# This pin powers the sensor
sleep(2)
sensor=DHT22(Pin(8))

led=Pin(25,Pin.OUT,value=0)#onboard LED

unblock_thread_lock=uasyncio.Lock()
async def unblock(func, *args, **kwargs):#https://github.com/peterhinch/micropython-async/blob/master/v3/docs/THREADING.md#4-taming-blocking-functions
	def wrap(func, message, args, kwargs):
		message.set(func(*args, **kwargs)) # Run the blocking function.
	msg = Message()
	await unblock_thread_lock.acquire()
	_thread.start_new_thread(wrap, (func, msg, args, kwargs))
	msg=await msg
	unblock_thread_lock.release()
	return msg

def request(url):
	# just need url to be sent, do not care about a reply, just yolo it
	led.on()
	r=urequest.get("http://10.0.0.69:8080/ok.txt")
	print(r.status_code)
	# Will hard lock between these 2 lines, if the above has multiple parameters only the 1st will print
	r.close()
	led.off()

async def main():
	await unblock(sensor.measure)
	collect() # Remove this line to enable hard locks...
	print(sensor.temperature(),"C;",sensor.humidity(),"%")
	lp=0
	print()
	while True:
		await uasyncio.sleep_ms(250)# simulate time for other stuff to work
		await unblock(request,"http://10.0.0.69:8080/ok.txt") # test page: 2 byte text file
		print('----------',lp,'-----------')
		lp+=1

uasyncio.run(main())