Comment 3 for bug 1819735

there seam to be 2 issues

2019-03-12 15:25:59.490 16855 ERROR nova.virt.libvirt.driver [req-04b22e72-a9a4-423e-a904-3396dcf7beb2 39cc388544de4fc0b33f421181fc8683 b9e3c4e073bd4c14a1dba80e4f98636a - default default] [instance: 981fcdcd-5121-46f8-b36c-35a20c3e651f] Live Migration failure: Cannot get interface MTU on 'brqb010f6ce-84': No such device: libvirtError: Cannot get interface MTU on 'brqb010f6ce-84': No such device

so libvirt raised an error which i guess we ignored then later we hit the vif timeout

do you see and os-vif related issue?
i noticed some failures in the gate recently for linuxbridge https://bugs.launchpad.net/os-vif/+bug/1893144. its proably unrelated but we do not have any linuxbridge live migration jobs for most patches. we have one that runs on a very limited set of changes
https://github.com/openstack/nova/blob/master/.zuul.yaml#L434-L439

but in general it very lightly tested. we might want to put that into the periodic pipeline.

i wont get to it today but i have a linux birdge test vm ill try deploying a second and see if i can replicate this later this week but i need to finish off a few other things first so it might slip to next week.