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https://issues.apache.org/jira/browse/AIRFLOW-1077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16172279#comment-16172279
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Pratik Khadloya commented on AIRFLOW-1077:
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I think i am running into the same issue. Airflow says the subdags are running,
but none of the steps within it are executing. When i restarted airflow, some
progress happened, but then it got blocked again.
> Subdags can deadlock
> --------------------
>
> Key: AIRFLOW-1077
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1077
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Alex Guziel
>
> Given a concurrency of n, if all n running tasks are Subdags, the subdags
> block any of their tasks from executing, leading to deadlock
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