Dev-iL commented on PR #64972:
URL: https://github.com/apache/airflow/pull/64972#issuecomment-4230895455
## CI Timeout Investigation:
`All-core:LowestDeps:14:3.12:Core...Serialization`
### Summary
The CI job `All-core:LowestDeps:14:3.12:Core...Serialization` was cancelled
after 1h5m (exceeding `TOTAL_TEST_TIMEOUT: 3600s`). This is a **pre-existing
flake**, not caused by this PR's changes.
### Evidence
**1. Only Python 3.12 affected**
The same test group (`LowestDeps:Core...Serialization`) passed on Python
3.10, 3.11, 3.13, and 3.14. Only the 3.12 run timed out.
**2. "Other" group stuck at 63%**
The "Other" test group reported "1 failed, 1093 passed, 12 skipped" at the
12:47 mark and made no further progress until cancellation at 13:40. The PR
adds ~8 tests — the hang is deep in pre-existing tests (1093+).
**3. PR code is identical between force-pushes**
Diffing the PR-specific files between commits 931fbf06 and 553c33ff (pre-
and post-rebase) shows zero differences — only the rebased base changed.
**4. Backend markers verified correct**
- `BACKEND=sqlite` env var is set in LowestDeps CI (confirmed from logs)
- `--backend` is NOT passed as a pytest CLI arg (`Extra pytest args: ()`)
- `@pytest.mark.backend("sqlite")` → runs (BACKEND matches) ✓
- `@pytest.mark.backend("postgres", "mysql")` → skipped (BACKEND doesn't
match) ✓
- No hang path through the backend marker logic
**5. Upstream changes between force-pushes**
The rebase picked up: `feat: restore os provider on core library (#64764)`,
`Remove unused/dead code in migration utils (#64947)`, `Added plugins command
to airflowctl (#64935)`, `Breeze: Show local reproduction commands (#63901)`.
None of these touch the test infrastructure in a way that would cause a Python
3.12-specific hang.
### Conclusion
Most likely cause: a pre-existing flaky test in the "Other" group that hangs
specifically on Python 3.12 (possibly a deadlock or resource contention issue).
The PR's changes (AST-based migration checks + migration util tests) are not
involved — they ran in a different test group and the PR files are
byte-identical across the rebase.
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