Context:

• Playwright Version: 1.17.2
• Operating System: Windows 11 - 64 bits
• Python version: 3.10
• Browser: Chromium

npx envinfo --preset playwright --markdown:

System:

• OS: Windows 10 10.0.22000
• Memory: 8.05 GB / 15.92 GB

Binaries:

• Node: 16.13.1 - C:\Program Files\nodejs\node.EXE
• npm: 8.1.2 - C:\Program Files\nodejs\npm.CMD

Languages:

• Bash: 4.4.19 - C:\Windows\system32\bash.EXE

Minimal example

import asyncio
import contextlib
import os

from playwright.async_api import async_playwright


async def a():
    with open(os.devnull, 'w') as fnull:
        with contextlib.redirect_stderr(fnull):
            await asyncio.sleep(0)


async def b():
    try:
        async with async_playwright():
            print('PLEASE WORK!')
    except ValueError as e:
        print(f':(   {e}')


async def main():
    await asyncio.gather(a(), a(), b())


if __name__ == '__main__':
    asyncio.run(main())

Expected output

PLEASE WORK!

Actual output

:( I/O operation on closed file

Description

Playwright fails if you suppress stderr.

I have detected it in a telegram bot that I have running with asyncio. If you mix tasks that affect stderr, this error occurs and playwright doesn't work or will not work until the program is completely restarted.

I am ashamed to recognize the amount of hours that I just spent to discover how to reproduce the bug in a minimal example (I have not slept today ._. ).