Solved by mrshenli in post #4 
              
              
                I see, sorry that I misread the original question. 

In summary, is it normal to see the error message I posted if I call init_rpc and don’t use it for 30 minutes? 

This is indeed a bug, and I think it is due to the following code, where the ProcessGroup RPC agent’s recvAnysource timed out. We shou…