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Description of problem: ------------------------- QMP drive_mirror command with "format":"raw" hang Version-Release number of selected component (if applicable): --------------------------------------------------------------- qemu-kvm-rhev-2.1.2-20.el7.x86_64 How reproducible: ------------------ 100% Steps to Reproduce: --------------------- 1. boot guest, do drive_mirror with target format RAW: { "execute": "drive-mirror", "arguments": { "device": "drive-virtio-disk0", "target": "/home/sn1", "format": "raw", "mode": "absolute-paths", "sync": "full", "speed": 1000000000, "on-source-error": "stop", "on-target-error": "stop" } 2. after step 1, command hangs, no return. CMD: /usr/libexec/qemu-kvm -enable-kvm -M pc-i440fx-rhel7.0.0 -smp 4 -m 4G -name rhel6.3-64 -uuid 3f2ea5cd-3d29-48ff-aab2-23df1b6ae213 -drive file=/home/RHEL-Server-7.1-64-virtio.raw,cache=none,if=none,rerror=stop,werror=stop,id=drive-virtio-disk0,format=raw,aio=native -device virtio-blk-pci,drive=drive-virtio-disk0,id=device-virtio-disk0,bootindex=1 -boot order=cd -monitor stdio -readconfig nfs/ich9-ehci-uhci.cfg -device usb-tablet,id=input0 -chardev socket,id=s1,path=/tmp/s1,server,nowait -device isa-serial,chardev=s1 -monitor tcp::1235,server,nowait -vga qxl -global qxl-vga.revision=3 -spice port=5930,disable-ticketing -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -vnc :10 -qmp tcp:0:5555,server,nowait -sandbox on -cpu host -netdev tap,script=/etc/qemu-ifup,id=netdev0 -device virtio-net-pci,netdev=netdev0,id=device-net0,mac=aa:54:00:11:22:33 Additional info: ------------------- 1. HMP command works correctly 2. If not specify "format": "raw", this leaves target format kept same with source, in this case: RAW, this also works fine.