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Description of problem:
for example: boot guest with addr=0x21.0, it will lead to qemu core dump. if addr values <0x20 then guest work well 

Version-Release number of selected component (if applicable):
# uname -r
2.6.32-191.el6.x86_64
# rpm -qa|grep kvm
qemu-kvm-0.12.1.2-2.190.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1./usr/libexec/qemu-kvm -m 4G -smp 4 -drive file=/dev/vg0/data512,if=none,id=drive-virtio0-0-0,format=qcow2,werror=ignore,rerror=ignore,cache=none -device virtio-blk-pci,drive=drive-virtio0-0-0,id=virti0-0-0 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:56:00:94:a3:f8,bootindex=1 -uuid 9e6f04cf-2ad7-45aa-9333-2d2ee26570c6 -boot c -monitor stdio -spice id=on,disable-ticketing,port=5911 -drive file=/dev/vg0/data126,if=none,id=drive-virtio0-0-126,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-virtio0-0-126,id=virti0-0-126,addr=0x21.0
2.
3.
  
Actual results:
core dump

Expected results:
Should have a hint or restrictions，should not core dump directly.

Additional info:

Closing since patch posted to resolve this problem for bz 678729.

*** This bug has been marked as a duplicate of bug 678729 ***