Description of problem:
This bug is from doing reproduction of https://bugzilla.redhat.com/show_bug.cgi?id=1506151#c7, boot a vm with two scsi disks that with dataplane, after migration, qemu processor hang on src host, vm hang, migration can't finish and "VM status: paused (inmigrate)" on dst host.

Version-Release number of selected component (if applicable):
x86:
3.10.0-792.el7.x86_64
qemu-kvm-rhev-2.10.0-10.el7.x86_64
seabios-bin-1.11.0-1.el7.noarch

How reproducible:
3/3

Steps to Reproduce:
1.Boot a guest on src host, there are two scsi disks that with dataplane:
/usr/libexec/qemu-kvm -nodefaults -object iothread,id=iothread0 -device virtio-scsi-pci,bus=pci.0,addr=0x1f,id=scsi0,iothread=iothread0 -drive file=/home/xianwang/rhel75.qcow2,media=disk,if=none,cache=none,id=drive_sysdisk,aio=native,format=qcow2,werror=stop,rerror=stop -device scsi-hd,drive=drive_sysdisk,bus=scsi0.0,id=sysdisk,bootindex=0 -drive file=/home/xianwang/r1.qcow2,if=none,cache=none,id=drive_ddisk_2,aio=native,format=qcow2,werror=stop,rerror=stop -device scsi-hd,drive=drive_ddisk_2,bus=scsi0.0,id=ddisk_2 -monitor stdio -vga std -vnc :1 -m 4096

2.on dst host, boot a guest with the same qemu cli with src, appending -incoming tcp:0:5801

3.on src host, do migration
(qemu) migrate -d tcp:10.66.10.208:5801
(qemu) info status 
VM status: running
(qemu) info migrate
Migration status: active


Actual results:
on src, qemu hang and vm hang on dst vnc, the status is "VM status: paused (inmigrate)" on dst host
kill the qemu processor of src, there are some messages prompt on dst host

on src:
(qemu) Killed

on dst:
(qemu) qemu-kvm: Failed to load virtio_pci/modern_state:modern_state
qemu-kvm: Failed to load virtio/extra_state:extra_state
qemu-kvm: Failed to load virtio-scsi:virtio
qemu-kvm: error while loading state for instance 0x0 of device '0000:00:1f.0/virtio-scsi'
qemu-kvm: warning: TSC frequency mismatch between VM (3392293 kHz) and host (3392167 kHz), and TSC scaling unavailable
qemu-kvm: load of migration failed: Input/output error
 

Expected results:
migration finish and vm work well on dst host

Additional info:
this issue is both for x86 and ppc
on ppc(p8), after killing the qemu processor of src, the error message of dst host is:
(qemu) qemu-kvm: Failed to load virtio_pci/modern_state:modern_state
qemu-kvm: Failed to load virtio/extra_state:extra_state
qemu-kvm: Failed to load virtio-scsi:virtio
qemu-kvm: error while loading state for instance 0x0 of device 'pci@800000020000000:1f.0/virtio-scsi'
qemu-kvm: load of migration failed: Input/output error