QUERY · ISSUE

Multithread breaks file operations on pico2w.

openby tudorapoopened 2025-01-08updated 2025-03-03

bugport-rp2

Port, board and/or hardware

RPI_PICO2_W

MicroPython version

MicroPython v1.25.0-preview.180.g495ce91ca on 2025-01-06; Raspberry Pi Pico 2 W with RP2350

Reproduction

copy the below threads using code and run it:

import time
import _thread

global killme

def threadtest():
    global killme
    print("Other starts")
    while True:
        if killme:
            break
        print("másik thread")
        time.sleep(3.17)
    print("Other ends")

killme = False

try:
    new_thread = _thread.start_new_thread(threadtest, ())
    print("Main starts")
    while True:
        print("Main thread")
        time.sleep(1)
except KeyboardInterrupt as theInterrupt:
    print("Main ends")
    killme = True

run it
stop it
try to copy or delete any file with mpremote, it will hang
powercycle (pull out the usb conenctor and back) and things will work until I run the above code again.

Expected behaviour

Expected to be able to upload code.

Observed behaviour

Was not able to upload code.

Additional Information

When I copied/ran non-threaded code, a simple hello world the problem did not happen.

Code of Conduct

Yes, I agree

CANDIDATE · ISSUE

TinyUSB callback can't recurse 20014b10

closedby tudorapoopened 2024-08-26updated 2025-07-01

bug

Port, board and/or hardware

raspberry pico pi w

MicroPython version

MicroPython v1.24.0-preview.224.g6c3dc0c0b on 2024-08-22; Raspberry Pi Pico W with RP2040

Reproduction

import time
import _thread

global killme

def threadtest():
    global killme
    print("Other starts")
    while True:
        if killme:
            break
        print("Other thread")
        time.sleep(1)
    print("Other ends")

killme = False

try:
    new_thread = _thread.start_new_thread(threadtest, ())
    print("Main starts")
    while True:
        print("Main thread")
        time.sleep(1)
except KeyboardInterrupt as theInterrupt:
    print("Main ends")
    killme = True

Expected behaviour

I expect it to run just like it does with MicroPython v1.21.0 on 2023-10-06; Raspberry Pi Pico W with RP2040

Observed behaviour

Starts to run, then when I press ctrl-c it dies:

Main ends
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: no module named 'main.py'
>>> FATAL: uncaught exception 20014b10
OSError: TinyUSB callback can't recurse

And from this point the pico is bricked, I have to nuke the flash and reinstall the firmware.

Additional Information

No, I've provided everything above.

Code of Conduct

Yes, I agree