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+
+keep savevm/loadvm and migration cause snapshot crash
+
+--Version:  qemu 2.1.0  public release
+--OS:          CentOS release 6.4
+--gcc:         4.4.7
+
+Hi:
+     I found problems when doing some tests on qemu migration and savevm/loadvm.
+On my experiment, a quest is migrated between two same host back and forth. 
+Source host would savevm after migration completed and incoming host loadvm before migration coming.
+
+image=./image/centos-1.qcow2
+
+====Migration Part====
+qemu-system-x86_64 \
+        -qmp tcp:$host_ip:4451,server,nowait \
+        -drive file=$image \
+        --enable-kvm \
+        -monitor stdio \
+        -m 8192 \
+        -device virtio-net-pci,netdev=net0,mac=$mac \
+        -netdev tap,id=net0,script=./qemu-ifup
+
+====Incoming Part====
+qemu-system-x86_64 \
+        -qmp tcp:$host_ip:4451,server,nowait \
+        -incoming tcp:0:4449 \
+        --enable-kvm \
+        -monitor stdio \
+        -drive file=$image \
+        -m 8192 \
+        -device virtio-net-pci,netdev=net0,mac=$mac \
+        -netdev tap,id=net0,script=./qemu-ifup
+
+
+Command lines:
+
+host1 $:  qemu-system-x86_64 ........  //migration part
+host2 $:  qemu-system-x86_64 ...incoming... //incoming part
+
+After finishing boot
+
+host1 (qemu) : migrate tcp:host2:4449
+host1 (qemu) : savevm s1
+host1 (qemu) : quit
+host1 $: qemu-system-x86_64 ...incoming... //incoming part
+host1 (qemu) : loadvm s1
+
+host2 (qemu) : migrate tcp:host1:4449
+host2 (qemu) : savevm s2
+host2 (qemu) : quit
+host2 $:  qemu-system-x86_64 ...incoming... //incoming part
+host2 (qemu) : loadvm s2
+
+host1 (qemu) : migrate tcp:host2:4449
+host1 (qemu) : savevm s3
+host1 (qemu) : quit
+host1 $: qemu-system-x86_64 ...incoming... //incoming part
+host1 (qemu) : loadvm s3
+
+I wish those operation can be success every time. 
+However problem happened irregularly when loadvm and error messages are not the same.
+
+host1 (qemu) :  loadvm s3
+qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
+Error -5 while activating snapshot 's3' on 'ide0-hd0'
+
+or
+
+host2 (qemu) : loadvm s2
+Error -22 while loading VM state
+
+
+I have done some sample test on savevm/loadvm
+On same host
+(qemu) savevm test1
+(qemu) loadvm test1
+(qemu) savevm test2
+(qemu) loadvm test2
+(qemu) savevm test3
+(qemu) loadvm test3
+(qemu) savevm test4
+(qemu) loadvm test4
+(qemu) savevm test5
+(qemu) loadvm test5
+(qemu) savevm test6
+(qemu) loadvm test6
+
+This is OK. No any problem.
+
+
+Any idea? 
+I think it is related to migration.
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