migration fails with error about ram device

[Serge Hallyn]

On one machine I call

./qemu-system-x86_64 -m 1024 -drive file=/srv/z.img,if=virtio,cache=none -vnc :1 -monitor stdio

on another, I call

./qemu-system-x86_64 -incoming tcp:0.0.0.0:9999 -vnc :1 -monitor stdio

then in the first monitor I call

migrate -b tcp:10.42.43.1:9999

This fails with a message on the second machine saying:

(qemu) qemu: warning: error while loading state for instance 0x0 of device 'ram'

This happens both with qemu 1.4.0+dfsg-1expubuntu4 and with today's clean pull from git://git.qemu.org/qemu.git.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: qemu (not installed)
ProcVersionSignature: Ubuntu 3.8.0-15.25-generic 3.8.4
Uname: Linux 3.8.0-15-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Mon Apr 1 14:00:32 2013
InstallationDate: Installed on 2012-03-24 (373 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120323)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: qemu
UpgradeStatus: Upgraded to raring on 2012-12-12 (109 days ago)

[Serge Hallyn (serge-hallyn)]

Specifying the memory size, the memballoon info, and hard drive files on the receiving end makes it work.