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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Also affects: nova/newton
   Importance: Undecided
       Status: New

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Changed in: nova
   Importance: High => Medium

** Changed in: nova/ocata
       Status: New => Confirmed

** Changed in: nova/newton
       Status: New => Confirmed

** Changed in: nova/pike
       Status: New => Confirmed

** Changed in: nova/newton
   Importance: Undecided => Medium

** Changed in: nova/ocata
   Importance: Undecided => Medium

** Changed in: nova/pike
   Importance: Undecided => Medium

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You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1737214

Title:
  Enabling guestfs.debug can hang guestfs.launch

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) newton series:
  Confirmed
Status in OpenStack Compute (nova) ocata series:
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  I noticed this while debugging this change:

  https://review.openstack.org/#/c/524710/

  When we enable guestfs.debug, we're receiving events from guestfs and
  logging them.

  However, guestfs.launch is run in an eventlet thread pool, and running
  things within an eventlet thread pool for native apps is a no-no for
  doing logging because it can cause a greenthread switch that makes us
  lose the return from the guestfs.launch call, which eventually means
  we hang when trying to create the instance.

  So we need to just run guestfs.launch non-threaded if guestfs.debug is
  enabled.

  From the logs, you can see the guestfs.launch thread switch here:

  http://logs.openstack.org/50/524750/1/check/legacy-tempest-dsvm-
  neutron-full-
  centos-7/a7f051e/logs/screen-n-cpu.txt.gz#_Dec_04_13_43_19_941869

  And the logging callback here:

  http://logs.openstack.org/50/524750/1/check/legacy-tempest-dsvm-
  neutron-full-
  centos-7/a7f051e/logs/screen-n-cpu.txt.gz#_Dec_04_15_25_29_320753

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