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Thanks famz who point out my double 'bus' specified in qemu-kvm command line, but I still hit it with qemu-kvm-rhev-0.12.1.2-2.427.el6.x86_64 after i remove the duplicate 'bus'.
e.g:...-drive file=/home/RHEL-Server-7.0-64-virtio.qcow2,if=none,id=drive-system-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,bus=pci.0,addr=0x4,id=scsi0 -device scsi-hd,drive=drive-system-disk,id=system-disk,bus=scsi0.0,bootindex=1 -drive file=/home/my-data-disk.raw,if=none,id=drive-hostdev0 -device scsi-hd,channel=0,scsi-id=0,lun=0,drive=drive-hostdev0,id=hostdev0,bus=scsi0.0
host info:
# uname -r && rpm -q qemu-kvm-rhev
2.6.32-475.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.427.el6.x86_64
(gdb) bt
#0 qdev_get_fw_dev_path_helper (dev=0x7f05ac507a10, p=0x7fff952d5410 "\001", size=-128)
at /usr/src/debug/qemu-kvm-0.12.1.2/hw/qdev.c:901
#1 0x00007f05aa315c13 in qdev_get_fw_dev_path (dev=<value optimized out>)
at /usr/src/debug/qemu-kvm-0.12.1.2/hw/qdev.c:920
#2 0x00007f05aa27e3d5 in get_boot_devices_list (size=0x7fff952d550c) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:2360
#3 0x00007f05aa3e4572 in fw_cfg_machine_ready (n=<value optimized out>, data=<value optimized out>)
at /usr/src/debug/qemu-kvm-0.12.1.2/hw/fw_cfg.c:344
#4 0x00007f05aa3360f4 in notifier_list_notify (list=<value optimized out>, data=0x0)
at /usr/src/debug/qemu-kvm-0.12.1.2/notify.c:37
#5 0x00007f05aa27fb0b in qemu_run_machine_init_done_notifiers (argc=65, argv=<value optimized out>,
envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:5127
#6 main (argc=65, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6608
(gdb) q
host info: # uname -r && rpm -q qemu-kvm-rhev 2.6.32-448.el6.x86_64 qemu-kvm-rhev-0.12.1.2-2.424.el6.x86_64 guest info: # uname -r 2.6.32-448.el6.x86_64 # /usr/libexec/qemu-kvm -M pc -cpu SandyBridge -enable-kvm -m 4096 -smp 4,sockets=2,cores=2,threads=1 -no-kvm-pit-reinjection -usb -device usb-tablet,id=input0 -name sluo_test -uuid 990ea161-6b67-47b2-b803-19fb01d30d30 -rtc base=localtime,clock=host,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,max_ports=16,vectors=0,bus=pci.0,addr=0x3 -chardev socket,id=channel1,path=/tmp/helloworld1,server,nowait -device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port1 -chardev socket,id=channel2,path=/tmp/helloworld2,server,nowait -device virtserialport,chardev=channel2,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port2 -drive file=/home/RHEL6.5-20131019.1_Server_x86_64.qcow2bk,if=none,id=drive-system-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,bus=pci.0,addr=0x4,id=scsi0 -device scsi-hd,drive=drive-system-disk,id=system-disk,bus=scsi0.0,bootindex=1 -nodefaults -vnc :1 -monitor stdio -drive file=/home/my-data-disk.raw,if=none,id=drive-hostdev0 -device scsi-hd,bus=scsi1.0,channel=0,scsi-id=0,lun=0,drive=drive-hostdev0,id=hostdev0,bus=scsi0.0 Segmentation fault (core dumped) Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Failed to read a valid object file image from memory. Core was generated by `/usr/libexec/qemu-kvm -M pc -cpu SandyBridge -enable-kvm -m 4096 -smp 4,sockets'. Program terminated with signal 11, Segmentation fault. #0 qdev_get_fw_dev_path_helper (dev=0x7fd4e84ff010, p=0x7fffd19cc4e0 <Address 0x7fffd19cc4e0 out of bounds>, size=-128) at /usr/src/debug/qemu-kvm-0.12.1.2/hw/qdev.c:901 901 l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size); Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.132.el6.x86_64 (gdb) bt #0 qdev_get_fw_dev_path_helper (dev=0x7fd4e84ff010, p=0x7fffd19cc4e0 <Address 0x7fffd19cc4e0 out of bounds>, size=-128) at /usr/src/debug/qemu-kvm-0.12.1.2/hw/qdev.c:901 Cannot access memory at address 0x7fffd19cc4d8 (gdb) bt full #0 qdev_get_fw_dev_path_helper (dev=0x7fd4e84ff010, p=0x7fffd19cc4e0 <Address 0x7fffd19cc4e0 out of bounds>, size=-128) at /usr/src/debug/qemu-kvm-0.12.1.2/hw/qdev.c:901 d = <value optimized out> l = 0 Cannot access memory at address 0x7fffd19cc4d8 (gdb)