[Bug 1697729] Re: port allocator allocates the same SPICE port for multiple guests (race condition)

[Aaron Johnson]

[Impact]

 * libvirt sporadically throws the following error and can be seen in
nova-compute.log:

2017-06-12 14:32:54.359 19007 ERROR nova.compute.manager [instance:
d1af2a13-0a53-4d9c-ada3-683e4973f28a] libvirtError: internal error:
process exited while connecting to monitor: ((null):63256): Spice-
Warning **: reds.c:2463:reds_init_socket: reds_init_socket: binding
socket to 10.141.112.21:5900 failed

 * This should be backported to improve the supportability of the SPICE
console in OpenStack

[Test Case]

 * Create multiple instances with nova-compute (via horizon or openstack
cli) using the spice-html5 console and watch your instances attempt to
re-use already bound ports...

[Regression Potential]

 * Unknown regression potential but worth pointing out that this patch
was used to fix this bug in the libvirt-3.1.0-1.el7 package release...

[Other Info]
 
 * We ran in to this bug as a result of the openstack ansible project using spice-html5 as the default console viewer in ocata (not sure when they switched from novnc to spice as default).

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https://bugs.launchpad.net/bugs/1697729

Title:
  port allocator allocates the same SPICE port for multiple guests (race
  condition)

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive ocata series:
  Triaged
Status in Ubuntu Cloud Archive pike series:
  Triaged
Status in libvirt package in Ubuntu:
  In Progress
Status in libvirt source package in Zesty:
  Triaged
Status in libvirt source package in Artful:
  In Progress

Bug description:
  Using the UCA ocata release of libvirt we sporatically recieve this
  error message in nova-compute.log:

  2017-06-12 14:32:54.359 19007 ERROR nova.compute.manager [instance:
  d1af2a13-0a53-4d9c-ada3-683e4973f28a] libvirtError: internal error:
  process exited while connecting to monitor: ((null):63256): Spice-
  Warning **: reds.c:2463:reds_init_socket: reds_init_socket: binding
  socket to 10.141.112.21:5900 failed

  Please backport the fix for the following bug into UCA ocata/pike releases:
  https://bugzilla.redhat.com/show_bug.cgi?id=1397440

  The patch is documented here:
  https://www.spinics.net/linux/fedora/libvir/msg144093.html

  We've tested backporting this same fix using the ocata UCA libvirt
  2.5.0-3ubuntu5~cloud0 source package and it fixes the problem for us.

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