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Description of problem:
virt-sysprep got segmentation fault on ppc64le host with a rhel7.2 ppc64le guest image. 

Version-Release number of selected component (if applicable):
# rpm -q libguestfs libguestfs-tools libvirt
libguestfs-1.28.1-1.35.el7.ppc64le
libguestfs-tools-1.28.1-1.35.el7.noarch
libvirt-1.2.17-13.el7.ppc64le

How reproducible:
always

Steps to Reproduce:
1. run virt-sysprep with
# virt-sysprep -a /var/lib/libvirt/images/jeos-19-64.qcow2  -n --operations defaults,-ssh-hostkeys -v -x
[   0.0] Examining the guest ...
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
Segmentation fault


2.
3.

Actual results:
fail

Expected results:
succeed

Additional info:
# qemu-img info /var/lib/libvirt/images/jeos-19-64.qcow2 
image: /var/lib/libvirt/images/jeos-19-64.qcow2
file format: qcow2
virtual size: 8.0G (8589934592 bytes)
disk size: 8.0G
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: true
    refcount bits: 16
    corrupt: false

guest with the image could be started.

*** This bug has been marked as a duplicate of bug 1224676 ***