Input/output error during migration

Operating system: Ubuntu 18.04.2 LTS
qemu version: 2.11.1, but also reproduced with 3.1.0 (compiled manually).
virsh --version: 4.0.0

Hello,

I am having an issue with migration of UEFI virtual machines. If the --copy-storage-inc and the --tunnelled libvirt flags are used together, the migration fails. The same command for non-uefi virtual machines (e.g the same libvirt xml without the <nvram> and <loader> tags) works.

The command/output error is:

virsh migrate --verbose --live --p2p --tunnelled --copy-storage-inc --change-protection --abort-on-error testuefi qemu+tcp://<ip>/system
error: internal error: qemu unexpectedly closed the monitor: Receiving block device images
2019-02-21T16:20:15.263261Z qemu-system-x86_64: error while loading state section id 2(block)
2019-02-21T16:20:15.263996Z qemu-system-x86_64: load of migration failed: Input/output error

If I remove one of the --tunnelled or the --copy-storage-inc flag, it works, for example:

virsh migrate --verbose --live --p2p --copy-storage-inc --change-protection --abort-on-error testuefi qemu+tcp://<ip>/system
Migration: [100 %]

virsh migrate --verbose --live --p2p --tunnelled --change-protection --abort-on-error testuefi qemu+tcp://<ip>/system
Migration: [100 %]

I have no idea why those two flags combined together produce an error, and only for UEFI virtual machines.

here is the libvirt xml definition:

<domain type='kvm' id='4'>
  <name>testuefi</name>
  <uuid>ce12de05-ec09-4b4b-a27a-47003a511bda</uuid>
  <description>CentOS 4.5 (32-bit)</description>
  <memory unit='KiB'>2097152</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <cputune>
    <shares>878</shares>
  </cputune>
  <resource>
    <partition>/machine</partition>
  </resource>
  <sysinfo type='smbios'>
    <system>
      <entry name='manufacturer'>Apache Software Foundation</entry>
      <entry name='product'>CloudStack KVM Hypervisor</entry>
      <entry name='uuid'>ce12de05-ec09-4b4b-a27a-47003a511bda</entry>
    </system>
  </sysinfo>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.11'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/OVMF/OVMF_CODE.fd</loader>
    <nvram>/var/lib/libvirt/qemu/nvram/testuefi_VARS.fd</nvram>
    <boot dev='cdrom'/>
    <boot dev='hd'/>
    <smbios mode='sysinfo'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>Westmere</model>
    <feature policy='require' name='vmx'/>
    <feature policy='require' name='vme'/>
    <feature policy='require' name='pclmuldq'/>
    <feature policy='require' name='x2apic'/>
    <feature policy='require' name='hypervisor'/>
    <feature policy='require' name='arat'/>
  </cpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/kvm-spice</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/testmigration.qcow2'/>
      <backingStore type='file' index='1'>
        <format type='raw'/>
        <source file='/var/lib/libvirt/images/b3e4b880-0611-43bc-9d71-9cdac138f6e2'/>
        <backingStore/>
      </backingStore>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver cache='none'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <alias name='ide0-1-0'/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0' model='piix3-uhci'>
      <alias name='usb'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'>
	    <alias name='pci.0'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='06:6a:20:00:00:55'/>
      <source bridge='public'/>
      <target dev='vnet4'/>
      <model type='virtio'/>
      <driver queues='2'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/2'/>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/2'>
      <source path='/dev/pts/2'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <input type='tablet' bus='usb'>
      <alias name='input0'/>
      <address type='usb' bus='0' port='1'/>
    </input>
    <input type='mouse' bus='ps2'>
      <alias name='input1'/>
    </input>
    <input type='keyboard' bus='ps2'>
      <alias name='input2'/>
    </input>
    <video>
      <model type='cirrus' vram='16384' heads='1' primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
</domain>

Here is the qemu command on the destination host:

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm-spice -name guest=testuefi-VM,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-14-testuefi-VM/master-key.aes -machine pc-i440fx-2.11,accel=kvm,usb=off,dump-guest-core=off -cpu Skylake-Server,vmx=on,pcid=on,ssbd=on,hypervisor=on -drive file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on -drive file=/var/lib/libvirt/qemu/nvram/testuefi-VM_VARS.fd,if=pflash,format=raw,unit=1 -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid b340b117-1704-4ccf-93a7-21303b12dd7f -smbios 'type=1,manufacturer=Apache Software Foundation,product=CloudStack KVM Hypervisor,uuid=b340b117-1704-4ccf-93a7-21303b12dd7f' -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-14-testuefi-VM/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/testmigration.qcow2,format=qcow2,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2 -drive if=none,id=drive-ide0-1-0,readonly=on,cache=none -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev tap,fd=35,id=hostnet0,vhost=on,vhostfd=37 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=06:a0:66:00:00:0c,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc vnc=unix:/var/run/qemu/b340b117-1704-4ccf-93a7-21303b12dd7f.sock -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -incoming defer -msg timestamp=on

Thanks,