pierrejeambrun commented on code in PR #61281:
URL: https://github.com/apache/airflow/pull/61281#discussion_r2783495984
##########
airflow-core/src/airflow/api_fastapi/main.py:
##########
@@ -23,6 +23,24 @@
# This ensures plugins loaded at import time get the correct secrets backend
chain
os.environ["_AIRFLOW_PROCESS_CONTEXT"] = "server"
+# Defensive: Disable uvloop if PYTHONASYNCIODEBUG=1 is set (see Airflow issue
#61214)
+if os.environ.get("PYTHONASYNCIODEBUG") == "1":
+ import warnings
+
+ warnings.warn(
+ "PYTHONASYNCIODEBUG=1 detected: uvloop is not compatible with asyncio
debug mode on Python 3.13+. "
+ "Falling back to default asyncio event loop.",
+ RuntimeWarning,
+ stacklevel=2,
+ )
+else:
+ try:
+ import uvloop
+
+ uvloop.install()
+ except ImportError:
+ pass
+
Review Comment:
What is that else case for?
##########
airflow-core/newsfragments/61214.significant.rst:
##########
@@ -0,0 +1,26 @@
+fix(api): disable uvloop if PYTHONASYNCIODEBUG=1 to prevent segfault (issue
#61214)
+
+<!--
+Thank you for contributing!
+
+This PR disables uvloop and falls back to the default asyncio event loop if
PYTHONASYNCIODEBUG=1 is set, preventing a segmentation fault in the Airflow API
server on Python 3.13+ (see issue #61214). A warning is emitted at startup if
this configuration is detected.
+
+* related: #61214
+-->
+
+---
+
+##### Was generative AI tooling used to co-author this PR?
+
+- [X] Yes (GitHub Copilot)
+
+<!--
+Generated-by: GitHub Copilot following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
+-->
+
+---
+
+* Read the **[Pull Request
Guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#pull-request-guidelines)**
for more information. Note: commit author/co-author name and email in commits
become permanently public when merged.
+* For fundamental code changes, an Airflow Improvement Proposal
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvement+Proposals))
is needed.
+* When adding dependency, check compliance with the [ASF 3rd Party License
Policy](https://www.apache.org/legal/resolved.html#category-x).
+* For significant user-facing changes create newsfragment:
``{pr_number}.significant.rst`` or ``{issue_number}.significant.rst``, in
[airflow-core/newsfragments](https://github.com/apache/airflow/tree/main/airflow-core/newsfragments).
Review Comment:
What is that newsfragment for? Looks like hallucinated code from AI tool
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