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Description of problem:
As subject

Version-Release number of selected component (if applicable):
libvirt-3.2.0-15.el7a.x86_64
qemu-kvm-rhev-2.9.0-14.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
According to the last sentence in https://bugzilla.redhat.com/show_bug.cgi?id=1461638#c16, I file this bug.
1. Run a VM with rbd backend
2. Create external snapshot for the rbd disk
3. Do blockcommit. You will find <host/> missing in VM's xml.

Actual results:
As step3

Expected results:
<host/> is not missing

Additional info:

Hi Peter,
Since time is tight to fix it in 7.4, we should add this as known issue of release note and offer https://bugzilla.redhat.com/show_bug.cgi?id=1461638#c17 as workaround. What do you think?

It might be a good idea to do this. This is a bug in qemu though so I'll move it.

The string recorded in the overlay image by qemu after a snapshot is:

json:{"driver": "raw", "file": {"pool": "rbd", "image": "V", "driver": "rbd", "=keyvalue-pairs": "[\"auth_supported\", \"none\", \"mon_host\", \"10.73.75.52\"]"}}

As seen, this does not contain the 'server' section, but contains an undocumented "=keyvalue-pairs".

Since the bug moved to qemu, duplicated with BZ1464837

*** This bug has been marked as a duplicate of bug 1464837 ***