Qemu-KVM Livate Migration 0.12.2 -> 0.12.3/4 broken?

[Peter Lieven <pl@dlh.net>]

Hi Qemu/KVM Devel Team,

Live Migration from a 0.12.2 qemu-kvm to a 0.12.3 (and 0.12.4)
does not work: "load of migration failed"

Is there any way to find out, why exactly it fails? I have
a lot of VMs running on 0.12.2 and would like to migrate
them to 0.12.4

cmdline:
-net tap,vlan=6,script=no,downscript=no,ifname=tap7 -net 
nic,vlan=6,model=e1000,macaddr=52:54:00:fe:00:88   -net 
tap,vlan=651,script=no,downscript=no,ifname=tap8 -net 
nic,vlan=651,model=e1000,macaddr=52:54:00:ff:00:69   -drive 
file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-b6eca7604-6280020bc4b4bde8-quagga,if=ide,boot=on,cache=none,aio=native 
  -m 256 -monitor tcp:0:4090,server,nowait -vnc :90 -name 'Quagga' 
-boot order=dc,menu=on  -k de  -incoming tcp:172.21.59.132:5090 
-pidfile /var/run/qemu/vm-148.pid  -rtc base=utc,clock=vm  -usb 
-usbdevice tablet  -no-kvm-irqchip  -vga cirrus

Any hints would be appreciated!

Thanks,
Peter