That seems to be the Libvirt of Ubuntu in Xenial. In the past similar issues were uncommon configs or changed behavior on updates that triggered apparmor or SELinux protection.
=> https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1747442 => https://bugzilla.redhat.com/show_bug.cgi?id=731243 It could as well be some variant of bug 1677398. If you are still affected by this, could you check: 1. if it also happens on newer libvirt versions e.g. do a trial run in the most recent Ubuntu 2. if it does could you check dmesg in your setup for related apparmor denials? ** Bug watch added: Red Hat Bugzilla #731243 https://bugzilla.redhat.com/show_bug.cgi?id=731243 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1633508 Title: libvirt cannot hot insert interfaces to qemu Status in QEMU: Incomplete Bug description: When attempting to hot insert an interface using Ubuntu 16.04.1, I get the following $ virsh attach-interface --domain gluster1 --type direct \ > --source test0 --model virtio \ > --mac 2a:b6:b0:dc:c7:c4 --config --live error: Failed to attach interface error: internal error: unable to execute QEMU command 'getfd': No file descriptor supplied via SCM_RIGHTS test0 exists: $ ip link show test0 35: test0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether aa:8c:65:2e:79:61 brd ff:ff:ff:ff:ff:ff Just in case I did it wrong with direct, I did network $ virsh net-list Name State Autostart Persistent ---------------------------------------------------------- default active yes yes mgmtnet0 active yes yes $ virsh attach-interface --domain gluster1 --type network \ > --source default --model virtio \ > --mac 2a:b6:b0:dc:c7:c4 --config --live error: Failed to attach interface error: internal error: unable to execute QEMU command 'getfd': No file descriptor supplied via SCM_RIGHTS This seems to be an old bug, but is still present. Other relevant information: $ qemu-system-x86_64 --version QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.5), Copyright (c) 2003-2008 Fabrice Bellard $ virsh -v 1.3.1 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1633508/+subscriptions
