Fix included in qemu-kvm-rhev-2.10.0-21.el7_5.2

Verified with qemu-kvm-rhev-2.10.0-21.el7_5.2, the problem has been resolved, so set its status to "verified".
Test version:
 qemu version: qemu-kvm-rhev-2.10.0-21.el7_5.2
 kernel version:3.10.0-862.el7.x86_64

Test steps:
 1. start guest with cmds:
    /usr/libexec/qemu-kvm \
-name 'avocado-vt-vm1'  \
-machine pc \
-vga std  \
-object iothread,id=iothread0 \
-object iothread,id=iothread1 \
-device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=03,iothread=iothread0 \
-drive id=drive_image1,if=none,snapshot=on,aio=native,cache=none,format=qcow2,file=/home/kvm_autotest_root/images/rhel75-64-virtio.qcow2 \
-device scsi-hd,id=image1,drive=drive_image1,bus=scsi0.0,lun=0 \
-device virtio-net-pci,mac=9a:b2:b3:b4:b5:b6,id=iduCv1Ln,vectors=4,netdev=idKgexFk,bus=pci.0,addr=05  \
-netdev tap,id=idKgexFk,vhost=on \
-m 4096  \
-smp 4,maxcpus=4,cores=2,threads=1,sockets=2  \
-cpu host \
-vnc :1  \
-enable-kvm \
-monitor stdio \
-device virtio-scsi-pci,id=scsi1,bus=pci.0,addr=04,iothread=iothread1 \
-drive id=data_image1,if=none,werror=stop,rerror=stop,cache=none,format=qcow2,file=/home/test.qcow2 \
-device scsi-hd,id=data1,drive=data_image1,bus=scsi1.0,lun=0 \

2.Run dd in guest:
  dd if=/dev/zero of=/dev/sdb bs=4K count=1000000000 oflag=direct status=progress

3. During dd running, quit qemu
  (qemu)quit

Test result:
 QEMU quit successfully.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:1369