zizhong opened a new issue #7116:
URL: https://github.com/apache/trafficserver/issues/7116


   Recently we noticed the event loop stoped on some of the ATS boxes.
   Profiling shows the issue is in iterating the pending_dns queue.
   
![image](https://user-images.githubusercontent.com/3625100/90207752-efbc8400-dd9b-11ea-88e0-bb0fa5833b56.png)


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