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Hi. I have exactly the same error. Can't run any instance :

 {"message": "No valid host was found. ", "code": 500, "details": "  File \"/usr/lib/python2.7/dist-packages/nova/scheduler/filter_scheduler.py\", line 108, in schedule_run_instance |                                      |     raise exception.NoValidHost(reason=\"\")  |

and, within the libvirt.log :

2014-12-18 15:22:31.303+0000: 21920: info : libvirt version: 1.2.2 
2014-12-18 15:22:31.303+0000: 21920: error : virNetSocketReadWire:1454 : End of file while reading data: Input/output error

Did you find the issue ? Many thx.