Comment 1 for bug 1685340

The actual failure in this case happened on the source host:

http://logs.openstack.org/43/458843/1/check/gate-tempest-dsvm-multinode-live-migration-ubuntu-xenial/697a501/logs/subnode-2/libvirt/qemu/instance-00000001.txt.gz

qemu-system-x86_64: /build/qemu-5OJ39u/qemu-2.8+dfsg/block/io.c:1514: bdrv_co_pwritev: Assertion `!(bs->open_flags & BDRV_O_INACTIVE)' failed.

And shows up like this on the dest host:

http://logs.openstack.org/43/458843/1/check/gate-tempest-dsvm-multinode-live-migration-ubuntu-xenial/697a501/logs/libvirt/qemu/instance-00000001.txt.gz

/build/qemu-5OJ39u/qemu-2.8+dfsg/nbd/server.c:nbd_receive_request():L710: read failed

This ML post is related:

http://lists.nongnu.org/archive/html/qemu-devel/2017-04/msg01086.html