During F20 testing, both Kamil Paral and myself have noticed that the console output for our test VMs is often corrupted. It looks like content from the current boot is overlaid over content from previous boots, sometimes in garbled form (the old content, not the new). This is with F20 guests on F20 hosts. If I start up a guest in virt-manager and leave it sitting at a corrupted console display - like the bootloader screen - then connect to the same VM with spicy, the corruption does not appear. So it seems like a virt-manager issue. I'll attach screenshots.
Created attachment 824761 [details] screenshot of virt-manager showing the issue, booting an F20 live image
Created attachment 824762 [details] screenshot of spicy connected to the same VM from the v-m screenshot, seconds later - no corruption
*** This bug has been marked as a duplicate of bug 1017955 ***