Bug 2155463

Summary: meson test crashes with Python 3.12: RuntimeError: There is no current event loop in thread 'MainThread'.
Product: [Fedora] Fedora Reporter: Tomáš Hrnčiar <thrnciar>
Component: mesonAssignee: Carl George 🎩 <carl>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: 0xmrtt, carl, dev.fedora-rhbz, gnome-sig, igor.raits, klember, mhroncok, thrnciar, wtaymans
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Fixed In Version: meson-1.0.0-2.fc38 Doc Type: If docs needed, set a value
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Last Closed: 2023-01-09 10:55:23 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2135404, 2155470    

Description Tomáš Hrnčiar 2022-12-21 10:24:57 UTC
blueprint-compiler fails to build with Python 3.12.0a3.

Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/mesonbuild/mesonmain.py", line 194, in run
    return options.run_func(options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mesonbuild/mtest.py", line 2073, in run
    return th.doit()
           ^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mesonbuild/mtest.py", line 1754, in doit
    self.run_tests(runners)
  File "/usr/lib/python3.12/site-packages/mesonbuild/mtest.py", line 1892, in run_tests
    loop = asyncio.get_event_loop()
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/asyncio/events.py", line 676, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'MainThread'.

asyncio.get_event_loop() and many other asyncio functions like ensure_future(), shield() or gather(), and also the get_event_loop() method of BaseDefaultEventLoopPolicy now raise a RuntimeError if called when there is no running event loop and the current event loop was not set. Previously they implicitly created and set a new current event loop. DeprecationWarning is no longer emitted if there is no running event loop but the current event loop is set in the policy. (Contributed by Serhiy Storchaka in gh-93453.)

https://github.com/python/cpython/issues/93453
https://docs.python.org/3.12/whatsnew/3.12.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.12/fedora-rawhide-x86_64/05133219-blueprint-compiler/

For all our attempts to build blueprint-compiler with Python 3.12, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.12/package/blueprint-compiler/

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 3.12:
https://copr.fedorainfracloud.org/coprs/g/python/python3.12/

Let us know here if you have any questions.

Python 3.12 is planned to be included in Fedora 39. To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.12.
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.

Comment 1 Lyes Saadi 2022-12-21 11:45:15 UTC
This is an issue with the meson test utility. Transferring the bug report there.

Comment 2 Miro Hrončok 2022-12-21 14:02:57 UTC
*** Bug 2155490 has been marked as a duplicate of this bug. ***

Comment 3 Elliott Sales de Andrade 2022-12-22 01:49:44 UTC
*** Bug 2155475 has been marked as a duplicate of this bug. ***

Comment 4 Dominik 'Rathann' Mierzejewski 2023-01-09 10:14:39 UTC
It looks like this was fixed in upstream meson, please update or back-port the fix.

Comment 6 Miro Hrončok 2023-01-09 10:53:25 UTC
*** Bug 2155470 has been marked as a duplicate of this bug. ***

Comment 7 Miro Hrončok 2023-01-09 10:55:23 UTC
Fixed in dist git. No actual build needed.

Comment 8 Miro Hrončok 2023-01-09 10:58:56 UTC
And for the record, https://copr.fedorainfracloud.org/coprs/g/python/python3.12/package/blueprint-compiler/ is now successfully built.