With recent release of OpenStack Train this issue reappears...
Upgrading from Stein to Train will require all VMs to be hard-rebooted
to be migrated as a final step because Live Migration fails with:
Oct 17 10:28:43 h2.1.openstack.r0cket.net libvirtd[1545]: Unable to read from
monitor: Connection reset by peer
Oct 17 10:28:43 h2.1.openstack.r0cket.net libvirtd[1545]: internal error: qemu
unexpectedly closed the monitor: 2019-10-17T10:28:42.981201Z
qemu-system-x86_64: get_pci_config_device: Bad config data: i=0x10 read: a1
device: 1 cmask: ff wmask: c0 w1cmask:0
2019-10-17T10:28:42.981250Z qemu-system-x86_64: Failed to load PCIDevice:config
2019-10-17T10:28:42.981263Z qemu-system-x86_64: Failed to load
virtio-balloon:virtio
2019-10-17T10:28:42.981272Z qemu-system-x86_64: error while loading state for
instance 0x0 of device '0000:00:05.0/virtio-balloon'
2019-10-17T10:28:42.981391Z qemu-system-x86_64: warning: TSC frequency mismatch
between VM (2532609 kHz) and host (2532608 kHz), and TSC scaling unavailable
2019-10-17T10:28:42.983157Z qemu-system-x86_64: warning: TSC frequency mismatch
between VM (2532609 kHz) and host (2532608 kHz), and TSC scaling unavailable
2019-10-17T10:28:42.983672Z qemu-system-x86_64: load of migration failed:
Invalid argument
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https://bugs.launchpad.net/bugs/1838569
Title:
virtio-balloon change breaks post 4.0 upgrade
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