python-systemd fails to build with Python 3.10.0a1.

systemd/test/test_journal.py::test_reader_messageid_match Fatal Python error: Segmentation fault

Current thread 0x00007f2c8f476740 (most recent call first):
  File "/builddir/build/BUILD/python-systemd-234/build/lib.linux-x86_64-3.10/systemd/journal.py", line 244 in add_match
  File "/builddir/build/BUILD/python-systemd-234/build/lib.linux-x86_64-3.10/systemd/journal.py", line 363 in messageid_match
  File "/builddir/build/BUILD/python-systemd-234/build/lib.linux-x86_64-3.10/systemd/test/test_journal.py", line 208 in test_reader_messageid_match
  File "/usr/lib/python3.10/site-packages/_pytest/python.py", line 180 in pytest_pyfunc_call
  File "/usr/lib/python3.10/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/lib/python3.10/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/lib/python3.10/site-packages/_pytest/python.py", line 1570 in runtest
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 153 in pytest_runtest_call
  File "/usr/lib/python3.10/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/lib/python3.10/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 247 in <lambda>
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 294 in from_call
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 246 in call_runtest_hook
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 207 in call_and_report
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 117 in runtestprotocol
  File "/usr/lib/python3.10/site-packages/_pytest/runner.py", line 100 in pytest_runtest_protocol
  File "/usr/lib/python3.10/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/lib/python3.10/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/lib/python3.10/site-packages/_pytest/main.py", line 321 in pytest_runtestloop
  File "/usr/lib/python3.10/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/lib/python3.10/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/lib/python3.10/site-packages/_pytest/main.py", line 296 in _main
  File "/usr/lib/python3.10/site-packages/_pytest/main.py", line 240 in wrap_session
  File "/usr/lib/python3.10/site-packages/_pytest/main.py", line 289 in pytest_cmdline_main
  File "/usr/lib/python3.10/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/lib/python3.10/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/lib/python3.10/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/lib/python3.10/site-packages/_pytest/config/__init__.py", line 157 in main
  File "/usr/lib/python3.10/site-packages/_pytest/config/__init__.py", line 180 in console_main
  File "/usr/lib/python3.10/site-packages/pytest/__main__.py", line 7 in <module>
  File "/usr/lib64/python3.10/runpy.py", line 87 in _run_code
  File "/usr/lib64/python3.10/runpy.py", line 197 in _run_module_as_main
/bin/sh: line 1:   649 Segmentation fault      (core dumped) /usr/bin/python3 -m pytest . ../../docs -v
make: *** [Makefile:60: check] Error 139

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/01715166-python-systemd/

For all our attempts to build python-systemd with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/python-systemd/

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 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
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.