So I've seen this issue frequently through F19 testing, but it's hard to pin down *precisely* the conditions that cause it.

Roughly, though, I quite often notice that on system or virt-manager startup, at least one of my VMs is missing. It _seems_ like it's always VMs that were running in the last libvirt 'session'. I _think_ it may only happen when the system or at least libvirtd shutdown uncleanly (i.e., crashed).

For instance, just now I had a kernel hang while a VM was running, and on the next boot, that VM is missing from the list in virt-manager. All my other VMs are listed, just that one is missing. I've just checked and it's also missing from the list returned by 'virsh list --all', so this isn't a virt-manager issue.

If I restart libvirtd manually - 'systemctl restart libvirtd.service' - the VM shows up again.

Here's (hopefully) relevant info from checking on current libvirtd 'status', restarting libvirtd (so now it's in 'working' state) and comparing the same info:

[root@adam adamw]# systemctl status libvirtd.service
libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled)
   Active: active (running) since Fri 2013-06-28 11:06:24 PDT; 15min ago
 Main PID: 1245 (libvirtd)
   CGroup: name=systemd:/system/libvirtd.service
           ├─1245 /usr/sbin/libvirtd
           └─1495 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default....

Jun 28 11:06:25 adam.localdomain dnsmasq[1495]: using nameserver 64.59.144.90#53
Jun 28 11:06:25 adam.localdomain dnsmasq[1495]: using local addresses only f...s
Jun 28 11:06:25 adam.localdomain dnsmasq[1495]: read /etc/hosts - 12 addresses
Jun 28 11:06:25 adam.localdomain dnsmasq[1495]: read /var/lib/libvirt/dnsmas...s
Jun 28 11:06:25 adam.localdomain dnsmasq-dhcp[1495]: read /var/lib/libvirt/dn...
Jun 28 11:06:25 adam.localdomain dnsmasq-dhcp[1495]: not giving name localhos...
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: libvirt version: 1.0.5.2, p...)
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: failed to connect to monito...s
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: cannot lookup default selin...g
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: port 0 must be in range (59...)
[root@adam adamw]# journalctl -ab | grep libvirtd
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: libvirt version: 1.0.5.2, package: 1.fc19 (Fedora Project, 2013-06-12-22:00:57, buildvm-12.phx2.fedoraproject.org)
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: failed to connect to monitor socket: No such process
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: cannot lookup default selinux label for /media/Sea500/images/Test_1.img
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: port 0 must be in range (5900, 65535)
[root@adam adamw]# systemctl restart libvirtd.service
[root@adam adamw]# journalctl -ab | grep libvirtd
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: libvirt version: 1.0.5.2, package: 1.fc19 (Fedora Project, 2013-06-12-22:00:57, buildvm-12.phx2.fedoraproject.org)
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: failed to connect to monitor socket: No such process
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: cannot lookup default selinux label for /media/Sea500/images/Test_1.img
Jun 28 11:06:27 adam.localdomain libvirtd[1245]: port 0 must be in range (5900, 65535)
[root@adam adamw]# systemctl status libvirtd.service
libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled)
   Active: active (running) since Fri 2013-06-28 11:22:20 PDT; 9s ago
 Main PID: 4142 (libvirtd)
   CGroup: name=systemd:/system/libvirtd.service
           ├─1495 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default....
           └─4142 /usr/sbin/libvirtd

Jun 28 11:22:20 adam.localdomain systemd[1]: Starting Virtualization daemon...
Jun 28 11:22:20 adam.localdomain systemd[1]: Started Virtualization daemon.
Jun 28 11:22:23 adam.localdomain dnsmasq[1495]: read /etc/hosts - 12 addresses
Jun 28 11:22:23 adam.localdomain dnsmasq[1495]: read /var/lib/libvirt/dnsmas...s
Jun 28 11:22:23 adam.localdomain dnsmasq-dhcp[1495]: read /var/lib/libvirt/dn...
Jun 28 11:22:23 adam.localdomain dnsmasq-dhcp[1495]: not giving name localhos...