Created attachment 1134814 [details]
screenshot-116M

Description of problem:
virt-v2v: error: libguestfs error: file receive cancelled by daemon when about 100M space left on host while conversion


Version-Release number of selected component (if applicable):
libvirt-1.2.17-13.el7_2.4.x86_64
kernel-3.10.0-229.29.1.el7
qemu-kvm-1.5.3-105.el7_2.3.x86_64
libguestfs-winsupport-7.2-1.el7.x86_64
virtio-win-1.8.0-4.el7.noarch
virt-v2v-1.28.1-1.55.el7_2.1.x86_64
libguestfs-1.28.1-1.55.el7_2.1.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Make about 100M space left on host, please see "screenshot-116M"

2.Convert guest from xen to local, the error shows as below, details please refer to log"virt-v2v-xen-kvm.log"
1.# virt-v2v -ic xen+ssh://10.66.106.64 -b virbr0 xen-rhel7.2-mxie -on mm -of raw
[   0.0] Opening the source -i libvirt -ic xen+ssh://10.66.106.64 xen-rhel7.2-mxie
[   0.0] Creating an overlay to protect the source from being modified
[   1.0] Opening the overlay
[   7.0] Initializing the target -o libvirt -os default
[   7.0] Inspecting the overlay
virt-v2v: error: libguestfs error: file receive cancelled by daemon

If reporting bugs, run virt-v2v with debugging enabled and include the
complete output:

  virt-v2v -v -x [...]

3.Convert guest from xen to rhev, the error shows as below, details please refer to log"virt-v2v-xen-rhev.log"
# virt-v2v -ic xen+ssh://10.66.106.64 -o rhev -os 10.73.72.63:/home/nfs_export -n ovirtmgmt -b ovirtmgmt xen-rhel7.2-mxie -of raw
[   0.0] Opening the source -i libvirt -ic xen+ssh://10.66.106.64 xen-rhel7.2-mxie
[   0.0] Creating an overlay to protect the source from being modified
[   1.0] Opening the overlay
[   7.0] Initializing the target -o rhev -os 10.73.72.63:/home/nfs_export
[   7.0] Inspecting the overlay
virt-v2v: error: libguestfs error: file receive cancelled by daemon

If reporting bugs, run virt-v2v with debugging enabled and include the
complete output:

  virt-v2v -v -x [...]


Actual results:
As above description

Expected results:
Should report the error like below:
qemu-img: /var/tmp/v2vovl7dab64.qcow2: Could not write qcow2 header: No space left on device
virt-v2v: error: qemu-img command failed, see earlier errors


Addtional info: