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Description of problem: The virtio-scsi migration format is not ready for multiqueue. An extremely simple patch would avoid several headaches in RHEL7 time.
Verified this issue with steps and environment as follows: # rpm -q qemu-kvm-rhev qemu-kvm-rhev-0.12.1.2-2.287.el6.x86_64 1. Migrate single guest with two disks 5 times, both guest and host running well. 2. Migrate three guests in parallelly 5 times, both guests and host running well. So,this bug has been fixed.
When verify bug, using command line as follow: /usr/libexec/qemu-kvm -M rhel6.3.0 -enable-kvm -name RHEL-Server-6.3-64 -smp 2 -m 2G -uuid b36b1d00-3de1-4798-83b2-35afadbe77ed -boot menu=on -drive file=/home/rhel6.3-64.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native,media=disk,werror=stop,rerror=stop -device virtio-scsi-pci,id=bus1 -device scsi-hd,bus=bus1.0,drive=drive-virtio-disk0,id=virtio-scsi-pci0 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup-switch -device rtl8139,netdev=hostnet0,id=net0,mac=9a:40:41:d9:12:c9,bus=pci.0,addr=0x4,id=net0 -spice port=9000,disable-ticketing -vga qxl -monitor stdio -usb -usbdevice tablet -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -nodefaults -nodefconfig -drive file=/home/disk1.qcow2,if=none,id=drive-virtio-disk1,format=qcow2,cache=none,aio=native,media=disk,werror=stop,rerror=stop -device scsi-hd,bus=bus1.0,drive=drive-virtio-disk1,id=virtio-scsi-pci1
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Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2012-0746.html