Comment 9 for bug 1673350

It's possible to reproduce this problem in a qemu-kvm guest,
with an emulated disk: force the queue-length path selector.

# name=mfo-1704
# disk=/var/lib/libvirt/images/$name.qcow2
# iso=/var/lib/libvirt/images/zesty-server-ppc64el.iso.2017-03-14

# qemu-img create -f qcow2 $disk 128g

# virt-install \
  --name $name \
  --cdrom $iso \
  --vcpus 8,sockets=1,cores=1,threads=8 \
  --memory 8192 \
  --controller type=scsi,model=virtio-scsi \
  --disk format=qcow2,path=$disk \
  --disk device=cdrom,readonly=true,path=$iso \
  --network bridge=virbr0,model=virtio

Before the disk-detection stage (e.g., set-up users and passwords),
Go Back, Execute a shell, and set up multipath.conf, and resume install:

~ # cat <<EOF >/etc/multipath.conf
defaults {
  path_selector "queue-length 0"
  user_friendly_names yes
  find_multipaths no
}
EOF

~ # exit