The report on libvirt-users [1] got me into testing and I've found another problem fixed in the other patch. 1: https://www.redhat.com/archives/libvirt-users/2020-October/msg00035.html Michal Prívozník (2): qemu: Don't try to start NBD server twice qemu_migration: Don't mangle NBD part of migration cookie src/qemu/qemu_migration.c | 8 +++++--- src/qemu/qemu_migration_cookie.c | 2 +- 2 files changed, 6 insertions(+), 4 deletions(-) -- 2.26.2