FrankYang0529 opened a new pull request, #69525:
URL: https://github.com/apache/airflow/pull/69525
### Why
- Python 3.14 changed the default multiprocessing start method on Linux from
`fork` to `forkserver`.
- https://docs.python.org/3.14/whatsnew/3.14.html#multiprocessing
- With `fork`, the child is "effectively identical to the parent process"
and inherits the already-imported airflow modules. With `forkserver` it is
forked from a clean server process instead. The child must import the test
module and related airflow import chain.
-
https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
- From [run
28801030578](https://github.com/apache/airflow/actions/runs/28801030578), both
Postgres and Sqlite failed on the same test case
`test_end_drains_result_queue_to_avoid_join_deadlock` with Python 3.14. Both
took around 10 seconds to load modules.
```
2026-07-06T15:37:46.9780300Z 2026-07-06T15:24:31.594329Z [info ]
Shutting down LocalExecutor; waiting for running tasks to finish. Signal again
if you don't want to wait. [airflow.executors.local_executor.LocalExecutor]
2026-07-06T15:37:46.9782155Z 2026-07-06T15:24:38.789986Z [info ] Unit
test configuration loaded from 'unit_tests.cfg' [airflow.sdk.configuration]
loc=configuration.py:247
2026-07-06T15:37:46.9784010Z 2026-07-06T15:24:41.043595Z [warning ]
FileType is deprecated. Simply open files after parsing arguments.
[py.warnings] category=PendingDeprecationWarning
filename=/opt/airflow/airflow-core/src/airflow/cli/cli_config.py lineno=646
2026-07-06T15:37:46.9786186Z 2026-07-06T15:24:41.045115Z [warning ]
FileType is deprecated. Simply open files after parsing arguments.
[py.warnings] category=PendingDeprecationWarning
filename=/opt/airflow/airflow-core/src/airflow/cli/cli_config.py lineno=868
```
```
2026-07-06T16:23:12.8193184Z 2026-07-06T15:24:18.524457Z [info ]
Shutting down LocalExecutor; waiting for running tasks to finish. Signal again
if you don't want to wait. [airflow.executors.local_executor.LocalExecutor]
2026-07-06T16:23:12.8195400Z 2026-07-06T15:24:26.279040Z [info ] Unit
test configuration loaded from 'unit_tests.cfg' [airflow.sdk.configuration]
loc=configuration.py:247
2026-07-06T16:23:12.8200174Z 2026-07-06T15:24:28.560555Z [warning ]
FileType is deprecated. Simply open files after parsing arguments.
[py.warnings] category=PendingDeprecationWarning
filename=/opt/airflow/airflow-core/src/airflow/cli/cli_config.py lineno=646
2026-07-06T16:23:12.8203506Z 2026-07-06T15:24:28.562044Z [warning ]
FileType is deprecated. Simply open files after parsing arguments.
[py.warnings] category=PendingDeprecationWarning
filename=/opt/airflow/airflow-core/src/airflow/cli/cli_config.py lineno=868
```
- Other failed run:
- https://github.com/apache/airflow/actions/runs/28804860689
- https://github.com/apache/airflow/actions/runs/28709201804
- https://github.com/apache/airflow/actions/runs/28667462421
### How
Change the test's `execution_timeout` from 10s to 30s. Align it with
`test_clean_stop_on_signal` in the same file, which also spawns a real
subprocess.
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