an uncatchable asyncio exception from in 3.12.2 but not 3.11.5

[wangli]

For the following code:

from asyncio import create_task, run as aiorun, sleep as aiosleep
from asyncio import get_event_loop, get_running_loop
from os import fork, getpid, pipe, waitpid, WNOHANG
from os import close as osclose, read as osread, write as oswrite
from time import sleep

class Worker(object):
    class exctype(Exception): pass
    sleep_seconds = 0.1
    async def work(self) -> int | None:
        try: return await self.fork_and_wait()
        except Exception as exc: print('413124', exc)
        #task = create_task(self.fork_and_wait())
        #while not task.done() and not task.cancelled(): await aiosleep(0.1)
        #print('4124', task.exception)
        #try: return task.result()
        #except Exception as exc:
        #    print('95425', task, exc)

    async def fork_and_wait(self) -> int:
        print('fork_and_wait.0')
        pipe_fds = pipe()
        if (subpid := fork()) == 0: self.subprocess(pipe_fds)
        elif subpid < 0: raise self.exctype('fork failed')
        osclose(pipe_fds[1])
        loop = get_event_loop()
        self.line_cache = b''
        loop.add_reader(pipe_fds[0], self.pipe_reader, pipe_fds[0], subpid)
        while True:
            try: subpid0, status = waitpid(subpid, WNOHANG)
            except ChildProcessError as exc: break
            if subpid == subpid0: break
            await aiosleep(self.sleep_seconds)
        loop.remove_reader(pipe_fds[0])
        osclose(pipe_fds[0])
        return status
    def pipe_reader(self, rfd: int, subpid: int) -> None:
        if not (rbody := osread(rfd, 1024)): return
        print('xxxx', rbody)
    def subprocess(self, pipe_fds: tuple[int]) -> int:
        osclose(pipe_fds[0])
        for idx in range(4):
            oswrite(pipe_fds[1], ('xzy: %u\n' % idx).encode('utf-8'))
            sleep(0.2)
        osclose(pipe_fds[1])
        exit(0)
async def main_worker():
    task = create_task(Worker().work())
    #task = create_task(Worker().fork_and_wait())
    while not task.done() and not task.cancelled(): await aiosleep(0.1)
    print('frwrqwer', task.exception())
    try: result = task.result()
    except SystemExit as exc:
        print('kkkk', task, exc)
    except Worker.exctype as exc:
        print('zzzz', task, exc)
    except Exception as exc:
        print('aaaa', task, exc)
    print('cccc', result)

# To use the following code, works in 3.11.5, but not in 3.12.2
#loop = get_event_loop()
#loop.run_until_complete(main_worker())
# To use the following code, do not work in 3.11.5 and 3.12.2
aiorun(main_worker())

As the comment in the code, it works for me when run_until_complete is used in 3.11.5, but it does not works anymore in 3.12.2.
The following exception is issued and can not be catched:

Output:
fork_and_wait.0
xxxx b'xzy: 0\n'
xxxx b'xzy: 1\n'
xxxx b'xzy: 2\n'
xxxx b'xzy: 3\n'
Task exception was never retrieved

Error:
future: <Task finished name='Task-2' coro=<Worker.work() done, defined at /home/wangli/aifire/aifire.draft/aiopy/aioexit.py:10> exception=SystemExit(0)>
Traceback (most recent call last):
  File "/home/wangli/aifire/aifire.draft/aiopy/aioexit.py", line 66, in <module>
    aiorun(main_worker())
  File "/opt/py3.aifire/lib/python3.12/asyncio/runners.py", line 194, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/opt/py3.aifire/lib/python3.12/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/py3.aifire/lib/python3.12/asyncio/base_events.py", line 672, in run_until_complete
    self.run_forever()
  File "/opt/py3.aifire/lib/python3.12/asyncio/base_events.py", line 639, in run_forever
    self._run_once()
  File "/opt/py3.aifire/lib/python3.12/asyncio/base_events.py", line 1985, in _run_once
    handle._run()
  File "/opt/py3.aifire/lib/python3.12/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "/home/wangli/aifire/aifire.draft/aiopy/aioexit.py", line 11, in work
    try: return await self.fork_and_wait()
                ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/wangli/aifire/aifire.draft/aiopy/aioexit.py", line 23, in fork_and_wait
    if (subpid := fork()) == 0: self.subprocess(pipe_fds)
                                ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/wangli/aifire/aifire.draft/aiopy/aioexit.py", line 46, in subprocess
    exit(0)
  File "<frozen _sitebuiltins>", line 26, in __call__
SystemExit: 0

Output:
frwrqwer None
cccc 0

Yes, I known the dangerous about fork in async functions, but it should be very convenient if something can be passed through fork from parent to subprocess directly.