opeida commented on issue #44354:
URL: https://github.com/apache/airflow/issues/44354#issuecomment-3174227992
@kaxil sure! The mentioned issue was observed on 3.0.3. I will update my
environment to 3.0.4 and come back with the results.
### Issue description
The issue was that, after functioning correctly for a few runs, some of the
DAGs randomly disappeared from the UI and weren't scheduled to run. The
dag-processor failed to import them and logged the following error in their log
files:
```
{"timestamp":"2025-07-02T00:00:43.214131Z","level":"warning","event":"Process
exited abnormally","exit_code":126,"logger":"processor"}
```
At the same time, `kubectl logs <dag-processor-pod>` contained the following
error:
```
--- Supervised process Last chance exception handler ---
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/sdk/execution_time/supervisor.py",
line 377, in _fork_main
target()
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/dag_processing/processor.py",
line 123, in _parse_file_entrypoint
result = _parse_file(msg, log)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/dag_processing/processor.py",
line 139, in _parse_file
_execute_callbacks(bag, msg.callback_requests, log)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/dag_processing/processor.py",
line 179, in _execute_callbacks
raise NotImplementedError(
NotImplementedError: Haven't coded Task callback yet -
https://github.com/apache/airflow/issues/44354!
```
### Little research
After some googling, I assumed the `126 error` may be a permission issue but
found nothing here. The files were synced with `git-sync` sidecars without a
persistence directory. They had the following permissions/ownership in the
dag-processor container:
```
airflow@airflow-dag-processor-6b9ddd54db-cpxf6:/opt/airflow/dags/repo/dags/clicks_daily_report$
ls -la
total 24
drwxr-sr-x 2 65533 root 4096 Jul 23 15:56 .
drwxr-sr-x 5 65533 root 4096 Jul 23 15:56 ..
-rw-r--r-- 1 65533 root 0 Jul 23 15:56 __init__.py
-rw-r--r-- 1 65533 root 2212 Jul 23 15:56 clicks_daily_report.json
-rw-r--r-- 1 65533 root 7116 Jul 23 15:56 clicks_daily_report.py
-rw-r--r-- 1 65533 root 3717 Jul 23 15:56 helper.py
```
The executable bits in permissions are missing but @potiuk told he doesn't
believe Dag file processor uses executable bits of Dags for anything.
### Environment configuration
The deployed Airflow instance was based on the official resources only: GKE
cluster deployed with Helm chart v1.18.0 and an extended image based on
`apache/airflow:slim-3.0.3-python3.12`.
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