Kernel shuts down when sleep/timeout is too large

[x42005e1f]

When there are no ready tasks, Curio waits until the next deadline. However, on non-Windows systems, there is no upper limit by default, so any sleep/timeout that is too large may cause an OverflowError/OSError to be raised in the kernel context.

import curio


async def main():
    try:
        await curio.sleep(2_147_484)  # for epoll
    except BaseException as exc:
        print("EXCEPTION:", type(exc))
        raise


if __name__ == "__main__":
    curio.run(main)

EXCEPTION: <class 'curio.errors.TaskCancelled'>
Traceback (most recent call last):
  File "/home/user/workspace/test.py", line 13, in <module>
    curio.run(main)
  File "/home/user/.local/lib/python3.12/site-packages/curio/kernel.py", line 824, in run
    return kernel.run(corofunc, *args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.12/site-packages/curio/kernel.py", line 146, in run
    task = self._runner(coro)
           ^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.12/site-packages/curio/kernel.py", line 641, in kernel_run
    events = selector_select(timeout)
             ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/selectors.py", line 468, in select
    fd_event_list = self._selector.poll(timeout, max_ev)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OverflowError: timeout is too large

The quickest solution is to replace max_select_timeout=None with max_select_timeout=86400 (one day).

Related: python/cpython#64692 + python/cpython#78444.