I have seem this error in my machine: - Fedora 20 - x86_64 - libvirt-1.1.3.3-2.fc20.x86_64 Can anyone try this test please, and let me know if you see the error ? *************************************************************************** [rotru@dhcp-9-18-235-188 tests]$ sudo ./run_tests.sh test_model.ModelTests.test_delete_running_vm libvirt: DBus Utils error : Invalid argument E ====================================================================== ERROR: test_delete_running_vm (test_model.ModelTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "test_model.py", line 630, in test_delete_running_vm inst.vm_start(u'kīмkhī-∨м') File "/home/rotru/Projetos/Kimchi/kimchi/src/kimchi/model/vms.py", line 371, in start dom.create() File "/home/rotru/Projetos/Kimchi/kimchi/src/kimchi/model/libvirtconnection.py", line 65, in wrapper ret = f(*args, **kwargs) File "/usr/lib64/python2.7/site-packages/libvirt.py", line 708, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: Invalid argument ---------------------------------------------------------------------- Ran 1 test in 0.369s FAILED (errors=1) *************************************************************************** I could get rid of this error changing the name of the vm created. The current name uses weird characters and unicode, but this in intentional to check unicode in libvirt. You can see the code in commit '5f04ac0750aacc97befa0088ae69fd036236349a' Thanks, Rodrigo Trujillo