Или вот так:

# mkve start --name fst
libvir: QEMU error : internal error Unable to open monitor path /dev/pts/12
/usr/bin/mkve: internal error Unable to open monitor path /dev/pts/12

# mkve start --name fst
libvir: QEMU error : Failure while reading monitor startup output: Input/output error
/usr/bin/mkve: Failure while reading monitor startup output: Input/output error

Может будет интересен лог, когда виртуальная машина создавалась из bundle:

/usr/bin/mkve: Machine: run hypervisor-specific stuff after creating a template
/usr/bin/mkve: Machine: create and define an XML description of domain
/usr/bin/mkve: Machine: create with following xml:
<domain type="kvm">
  <name>fst</name>
  <memory>524288</memory>
  <vcpu>1</vcpu>
  <os>
    <type arch="x86_64" machine="pc">hvm</type>
    <boot dev="hd"/>
  </os>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <graphics type="vnc" port="-1"/>
    <disk device="disk" type="file">
      <source file="/var/lib/mkve/machines/fst/files.tar"/>
      <target dev="sda"/>
    </disk>
    <interface type="bridge">
      <source bridge="lan"/>
    </interface>
  </devices>
</domain>

/usr/bin/mkve: Machine: run hypervisor-specific stuff after defining an XML

Когда говоришь: # mkve start --name fst

В /var/log/messages появляеться такое:
May  6 17:36:17 stanv kernel: device vnet0 entered promiscuous mode
May  6 17:36:17 stanv kernel: lan: port 4(vnet0) entering learning state
May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifup-removable: ignored unknown interface 'vnet0' (lookup ALLOW_UNKNOWN option or create a usable configuration)
May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifup-removable: USE_HOTPLUG is disabled for vnet0
May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifup-removable: No TYPE is specified for iface 'vnet0' and can't guess automatically. Please fix.
May  6 17:36:17 stanv kernel: lan: port 4(vnet0) entering disabled state
May  6 17:36:17 stanv kernel: device vnet0 left promiscuous mode
May  6 17:36:17 stanv kernel: lan: port 4(vnet0) entering disabled state
May  6 17:36:17 stanv libvirtd: 17:36:17.448: error : internal error Unable to open monitor path /dev/pts/12
May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifdown-removable: ignored unknown interface 'vnet0' (lookup ALLOW_UNKNOWN option or create a usable configuration)
May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifdown-removable: No TYPE is specified for iface 'vnet0' and can't guess automatically. Please fix.
May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifdown-removable: USE_HOTPLUG is disabled for vnet0

(В ответ на комментарий №3)
> Когда говоришь: # mkve start --name fst
> 
> В /var/log/messages появляеться такое:
> May  6 17:36:17 stanv kernel: device vnet0 entered promiscuous mode
> May  6 17:36:17 stanv kernel: lan: port 4(vnet0) entering learning state
> May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifup-removable: ignored
> unknown interface 'vnet0' (lookup ALLOW_UNKNOWN option or create a usable
> configuration)
> May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifup-removable:
> USE_HOTPLUG is disabled for vnet0
> May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifup-removable: No TYPE
> is specified for iface 'vnet0' and can't guess automatically. Please fix.
> May  6 17:36:17 stanv kernel: lan: port 4(vnet0) entering disabled state
> May  6 17:36:17 stanv kernel: device vnet0 left promiscuous mode
> May  6 17:36:17 stanv kernel: lan: port 4(vnet0) entering disabled state
> May  6 17:36:17 stanv libvirtd: 17:36:17.448: error : internal error Unable to
> open monitor path /dev/pts/12
> May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifdown-removable:
> ignored unknown interface 'vnet0' (lookup ALLOW_UNKNOWN option or create a
> usable configuration)
> May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifdown-removable: No
> TYPE is specified for iface 'vnet0' and can't guess automatically. Please fix.
> May  6 17:36:17 stanv /etc/net: ERROR: /etc/net/scripts/ifdown-removable:
> USE_HOTPLUG is disabled for vnet0

rpm -qa | grep libvirt

Так что, какие симптомы, если обновиться до Сизифа?

.