devinbost commented on issue #6054:
URL: https://github.com/apache/pulsar/issues/6054#issuecomment-844625376


   To throw a curveball, I was able to reproduce this issue where the 
subscription is completely frozen while using the function from the code shared 
above. 
   
![image](https://user-images.githubusercontent.com/7418031/118907664-2c924a00-b8dd-11eb-9ac5-041b8f0856c2.png)
   Interestingly, the consumer has negative permits on all four partitions, but 
the function isn't doing anything. 
   So, that leads me to believe (again) that pendingAcks have maxed out the 
semaphore, causing the function to block while it waits for ack's from the 
broker. 


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