python-tornado fails to build with Python 3.15.0a1.

+ /usr/bin/python3 -m tornado.test
..................................................................ssssssssssssssssssssssssssssssssssssssssssss.............................................................................................................................................................................................................................................................................................................s........................................................................................................................................................................................................................s...............................................E....................................................................Exception ignored while finalizing socket <socket.socket fd=3, family=2, type=1, proto=6, laddr=('127.0.0.1', 34183)>:
Traceback (most recent call last):
  File "/usr/lib64/python3.15/asyncio/futures.py", line 368, in _chain_future
    def _chain_future(source, destination):
    
ResourceWarning: unclosed <socket.socket fd=3, family=2, type=1, proto=6, laddr=('127.0.0.1', 34183)>
............................................................................................................................................................................s...........s................ss...............................................................................s............................................................................................................................................s.....................................................
======================================================================
ERROR: test_multi_process (tornado.test.process_test.ProcessTest.test_multi_process)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-tornado-6.5.2-build/tornado-6.5.2/tornado/test/process_test.py", line 67, in test_multi_process
    id = fork_processes(3, max_restarts=3)
  File "/builddir/build/BUILD/python-tornado-6.5.2-build/tornado-6.5.2/tornado/process.py", line 140, in fork_processes
    id = start_child(i)
  File "/builddir/build/BUILD/python-tornado-6.5.2-build/tornado-6.5.2/tornado/process.py", line 128, in start_child
    pid = os.fork()
DeprecationWarning: This process (pid=1129) is multi-threaded, use of fork() may lead to deadlocks in the child.

https://docs.python.org/3.15/whatsnew/3.15.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.15/fedora-rawhide-x86_64/09789926-python-tornado/

For all our attempts to build python-tornado with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/package/python-tornado/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.15:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/

Let us know here if you have any questions.

Python 3.15 is planned to be included in Fedora 45.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.15.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.