[GitHub] [pulsar] Shoothzj opened a new issue #11783: ConcurrentModificationException occurs when failPendingMessages

[GitBox]

Shoothzj opened a new issue #11783:
URL: https://github.com/apache/pulsar/issues/11783


   ### Describe the bug
   
![image](https://user-images.githubusercontent.com/12933197/130885099-ecb22a9c-5422-4057-9f00-d85d1c24b84b.png)
   
   ### To Reproduce
   It's hard to reproduce.
   
   ### Expected behavior
   Keep the list operation safely.
   
   Additional context
   It occurs when restarting one of brokers(there were 2 running brokers), 
first client recevied `DisConnected` event, and then 
ConcurrentModificationException and some recycled already exception in timer 
task's OpSendMsg


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