Description of problem:
Boot a guest and save a internal snapshot, and then loading the snapshot. The guest image got corrupted.

# qemu-img check RHEL6.2-64.qcow2 

ERROR OFLAG_COPIED: offset=80000001998d0000 refcount=2
ERROR OFLAG_COPIED: offset=80000001998e0000 refcount=2
ERROR OFLAG_COPIED: offset=80000001998f0000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199900000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199910000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199920000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199930000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199940000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199950000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199960000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199970000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199980000 refcount=2
..........

Test with the steps in bug 729572, no error. File this bug as the error messages are different as bug 729572.

Version-Release number of selected component (if applicable):
kernel-2.6.32-195.el6.x86_64
qemu-kvm-0.12.1.2-2.185.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1.Boot a qcow2 image.

/usr/libexec/qemu-kvm -M rhel6.1.0 -cpu cpu64-rhel6,+x2apic -enable-kvm -m 4096 -smp 1 -name RHEL6.2-64 -uuid 075527b4-a514-4c58-aad3-84edfe54bb84 -monitor stdio -rtc base=localtime -boot c -device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x3 -drive file=/home/RHEL6.2-64.qcow2,if=none,id=virtio-drive-0,format=qcow2,cache=none,werror=stop,rerror=stop -device ide-drive,bus=ide.0,drive=virtio-drive-0,id=virtio0 -netdev tap,id=hostnet0,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:28:12,bus=pci.0,addr=0x5 -chardev socket,id=charchannel0,path=/tmp/foo,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 -usb -spice port=5930,disable-ticketing -k en-us -vga qxl -global qxl-vga.vram_size=67108864 -device virtio-balloon-pci,bus=pci.0,id=balloon0

2.(qemu) info snapshots 
(qemu) savevm sn1

3.After step 2 finished, load sn1.
(qemu) loadvm sn1

  
Actual results:
Guest image got corrupted, please check the error message in bug description.

Expected results:
No corruption for guest image.

Additional info:
Test on qemu-kvm-0.12.1.2-2.178.el6.x86_64, this issue exists as well.