qemu2.9 meet a question using reconnect about ovs+dpdk

env:
qemu-2.9
dpdk-16.11
ovs-2.6.1
host os:Linux compute 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
guest os is same with host

1. ovs service is normal
2. start 2 qemu vm, using vhostuser port as server
taskset 0x3f qemu-system-x86_64 -cpu host -smp 2,cores=2 -drive file=$QCOW2_IMAGE -m 4096M --enable-kvm -name $VM_NAME -nographic -object memory-backend-file,id=mem,size=$GUEST_MEM,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc -chardev socket,id=char1,path=$VHOST_SOCK_DIR/dpdkvhostuser0,server -netdev type=vhost-user,id=mynet1,chardev=char1,vhostforce,queues=2 -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mq=on,vectors=6  -nographic -vnc :0 
qemu-system-x86_64: -chardev socket,id=char1,path=/usr/local/var/run/openvswitch/dpdkvhostuser0,server: QEMU waiting for connection on: disconnected:unix:/usr/local/var/run/openvswitch/dpdkvhostuser0,server

taskset 0x3f qemu-system-x86_64 -cpu host -smp 2,cores=2 -drive file=$QCOW2_IMAGE -m 4096M --enable-kvm -name $VM_NAME -nographic -object memory-backend-file,id=mem,size=$GUEST_MEM,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc -chardev socket,id=char1,path=$VHOST_SOCK_DIR/dpdkvhostuser0,server -netdev type=vhost-user,id=mynet1,chardev=char1,vhostforce,queues=2 -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mq=on,vectors=6  -nographic -vnc :0 
qemu-system-x86_64: -chardev socket,id=char1,path=/usr/local/var/run/openvswitch/dpdkvhostuser0,server: QEMU waiting for connection on: disconnected:unix:/usr/local/var/run/openvswitch/dpdkvhostuser1,server

3. add br and vhostuser port as client
ovs-vsctl add-br br1 -- set bridge br1 datapath_type=netdev
ovs-vsctl add-port br1 dpdkvhostuser0 -- set Interface dpdkvhostuser0 type=dpdkvhostuserclient  options:vhost-server-path="/usr/local/var/run/openvswitch/dpdkvhostuser0"			
ovs-vsctl add-port br1 dpdkvhostuser1 -- set Interface dpdkvhostuser1 type=dpdkvhostuserclient  options:vhost-server-path="/usr/local/var/run/openvswitch/dpdkvhostuser1"			
			
4. ping between 2 vm is ok
5. restart ovs process
 systemctl restart openvswitch

6. there is a question ping between 2 vm error

7. change qemu from 2.9 to 2.7, everything become ok

ooking through old bug tickets... is this still an issue with the latest version of QEMU? Or could we close this ticket nowadays? And what is a "question ping between 2 vm error" ?

[Expired for QEMU because there has been no activity for 60 days.]