I am not seeing this during VM creation. 
Talking with the tester ,he telled me that he tested with rally.
I think this reason may be concurrency.
so I simulate this. I do as below:
#####################################################################
#add_port.sh  

#! /bin/bash

for i in $(seq 800)
do 
    ovs-vsctl add-port br1 "tap$i" 
done

#del_port.sh

#! /bin/bash
for i in $(seq 800)
do 
    ovs-vsctl --timeout=5 -- --if-exits del-port  "tap$i" &
done
wait
####################################################################
the console output:
 ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed 
(Protocol error)
 ........
 ........
 2019-10-15T07:11:15Z|00002|fatal_signal|WARN|terminating with signal 14 (Alarm 
clock)
 ovs-vsctl --timeout=5 -- --if-exists del-port "tap$i"
 ........
seeing this,  I think the concurrency has a problem. The concurrency count is 
about 70+ , problems above come out.

Thanks



name: renkic
email: [email protected]
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