Instance is not coming up even after soft/reboot reboot

Issue

• Instance won't start even after soft/hard reboot

• Error:

      fault:
        code: 500
        created: '2017-11-30T12:22:05Z'
        details: "  File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line\
          \ 204, in decorated_function\n    return function(self, context, *args, **kwargs)\n\
          \  File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 2978,\
          \ in reboot_instance\n    self._set_instance_obj_error_state(context, instance)\n\
          \  File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\", line 220,\
          \ in __exit__\n    self.force_reraise()\n  File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\"\
          , line 196, in force_reraise\n    six.reraise(self.type_, self.value, self.tb)\n\
          \  File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 2959,\
          \ in reboot_instance\n    bad_volumes_callback=bad_volumes_callback)\n  File \"\
          /usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\", line 2225, in\
          \ reboot\n    block_device_info)\n  File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\"\
          , line 2325, in _hard_reboot\n    vifs_already_plugged=True)\n  File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\"\
          , line 4923, in _create_domain_and_network\n    destroy_disks_on_failure)\n  File\
          \ \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\", line 220, in __exit__\n\
          \    self.force_reraise()\n  File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\"\
          , line 196, in force_reraise\n    six.reraise(self.type_, self.value, self.tb)\n\
          \  File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\", line\
          \ 4895, in _create_domain_and_network\n    post_xml_callback=post_xml_callback)\n\
          \  File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\", line\
          \ 4813, in _create_domain\n    guest.launch(pause=pause)\n  File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py\"\
          , line 144, in launch\n    self._encoded_xml, errors='ignore')\n  File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\"\
          , line 220, in __exit__\n    self.force_reraise()\n  File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\"\
          , line 196, in force_reraise\n    six.reraise(self.type_, self.value, self.tb)\n\
          \  File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py\", line\
          \ 139, in launch\n    return self._domain.createWithFlags(flags)\n  File \"/usr/lib/python2.7/site-packages/eventlet/tpool.py\"\
          , line 186, in doit\n    result = proxy_call(self._autowrap, f, *args, **kwargs)\n\
          \  File \"/usr/lib/python2.7/site-packages/eventlet/tpool.py\", line 144, in proxy_call\n\
          \    rv = execute(f, *args, **kwargs)\n  File \"/usr/lib/python2.7/site-packages/eventlet/tpool.py\"\
          , line 125, in execute\n    six.reraise(c, e, tb)\n  File \"/usr/lib/python2.7/site-packages/eventlet/tpool.py\"\
          , line 83, in tworker\n    rv = meth(*args, **kwargs)\n  File \"/usr/lib64/python2.7/site-packages/libvirt.py\"\
          , line 1069, in createWithFlags\n    if ret == -1: raise libvirtError ('virDomainCreateWithFlags()\
          \ failed', dom=self)\n"
        message: 'internal error: qemu unexpectedly closed the monitor: \:6789\;192.168.2.22\:6789,file.password-secret=virtio-disk1-secret0,format=raw,if=none,id=drive-virtio-disk1,serial=c9abf47c-a2c6-43b2-ab74-eb0eaf14d3c0,cache=writeback''
          -device virtio-blk-pci,scsi=of'