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[nova/neutron/openvswitch] "No such device" after failed live migrations


Hello all,

after a misconfigured setup of a couple of VMs, the live migration of 
those VMs failed.


Now we have some "No such device" listings in openvswitch for those VMs 
on some compute nodes.


(openvswitch-vswitchd)[root at ewos1-com1-prod /]# ovs-vsctl show
b5034213-9b15-45f5-8ce0-edcf32d16c57
     Manager "ptcp:6640:127.0.0.1"
         is_connected: true
     Bridge br-int
         Controller "tcp:127.0.0.1:6633"
             is_connected: true
         fail_mode: secure
         Port "qvo35487c68-23"
             tag: 5
             Interface "qvo35487c68-23"
*        Port "qvo5b1aac7e-d4"**
**            Interface "qvo5b1aac7e-d4"**
**                error: "could not open network device qvo5b1aac7e-d4 
(No such device)"**
**        Port "qvod9cdff27-9c"**
**            Interface "qvod9cdff27-9c"**
**                error: "could not open network device qvod9cdff27-9c 
(No such device)"*
         Port "qvoed2da602-02"
             tag: 32
             Interface "qvoed2da602-02"
         Port "qvoa63378f6-d9"


for example qvo5b1aac7e-d4


(openvswitch-vswitchd)[root at ewos1-com1-prod /]# ovs-vsctl list 
Interface  ca7e771b-88a0-4cf6-b9be-6be77816baff
_uuid               : ca7e771b-88a0-4cf6-b9be-6be77816baff
admin_state         : []
bfd                 : {}
bfd_status          : {}
cfm_fault           : []
cfm_fault_status    : []
cfm_flap_count      : []
cfm_health          : []
cfm_mpid            : []
cfm_remote_mpids    : []
cfm_remote_opstate  : []
duplex              : []
error               : "could not open network device qvo5b1aac7e-d4 (No 
such device)"
external_ids        : {attached-mac="fa:16:3e:4b:f0:4b", 
iface-id="5b1aac7e-d45b-4a40-8f30-1275b07ffc0b", iface-status=active, 
vm-uuid="c3fbcc6b-2dfe-4aa1-82bd-522b161a37a9"}
ifindex             : []
ingress_policing_burst: 0
ingress_policing_rate: 0
lacp_current        : []
link_resets         : []
link_speed          : []
link_state          : []
lldp                : {}
mac                 : []
mac_in_use          : []
mtu                 : []
mtu_request         : []
name                : "qvo5b1aac7e-d4"
ofport              : -1
ofport_request      : []
options             : {}
other_config        : {}
statistics          : {}
status              : {}
type                : ""

there are no tap devices or bridge devices on the compute node, but 
still the entry in openvswitch


root at computenode5:~# brctl show | grep 5b1aac7e
root at computenode5:~#


Is that an issue? if yes, should we remove the ports manually or reboot 
the compute nodes?


Could that lead to networking issues?

kind regards


Nicolas

...


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