Created attachment 889194 [details]
The VM XML description

Description of problem:
I have a virtual machine with scsi controller with "default" model defined. I can't start the VM and an error message is issued: "Error starting domain: internal error: Unable to determine model for scsi controller".

Version-Release number of selected component (if applicable):
libvirt-1.1.3.4-4.fc20.x86_64

How reproducible:
I'm just trying to start the VM when the host machine is booted.


Actual results:
Error starting domain: internal error: Unable to determine model for scsi controller

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 91, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 127, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1355, in startup
    self._backend.create()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 708, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error: Unable to determine model for scsi controller


Expected results:
VM started without the error above.

Additional info:
After restarting the libvirtd service (systemctl restart libvirtd.service), everything works correctly then.

Let me know if you need more debug info...