[Bug 1782647] Re: py3.7 possible race condition in threading

[Corey Bryant]

I was going to add heat to this bug as well, but they've moved their
bugs to storyboard. That's not that convenient. Anyway heat is affected
too if you update tox with py37 target and run tests.

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https://bugs.launchpad.net/bugs/1782647

Title:
  py3.7 possible race condition in threading

Status in Designate:
  New
Status in python3.7 package in Ubuntu:
  New

Bug description:
  I have a feeling this is an issue with a dependency that designate is
  using, or even with py3.7 itself, and not directly a designate issue.
  I'm hitting something similar in heat and will append the bug with
  details there once I get them narrowed down to a simple recreate.

  Things seem to get hung up in:

    File "/usr/lib/python3.7/threading.py", line 296, in wait
      waiter.acquire()

  and:

    File "/usr/lib/python3.7/threading.py", line 1048, in _wait_for_tstate_lock
      elif lock.acquire(block, timeout):

  To reproduce with designate, update tox.ini with the following. Note
  that https://review.openstack.org/#/c/583316/ and
  https://review.openstack.org/#/c/583297 are likely also needed:

  --- a/tox.ini
  +++ b/tox.ini
  @@ -1,6 +1,6 @@
   [tox]
   minversion = 2.0
  -envlist = py35,py27,flake8
  +envlist = py35,py37,py27,flake8
   skipsdist = True

   [testenv]
  @@ -39,6 +39,12 @@ commands =
     {[testenv]commands}
     stestr run '{posargs}'

  +[testenv:py37]
  +basepython = python3.7
  +commands =
  +  {[testenv]commands}
  +  stestr run 'designate\.tests\.test_workers\.test_processing\.TestProcessingExecutor\.(test_execute_multiple_tasks)'
  +
   [testenv:docs]
   basepython = python3
   deps =

  Notice that while updating tox with a py3.7 target, that also runs a
  single test, test_execute_multiple_tasks. The test will hang and
  require a Control-C to cancel it. The results look like this:
  https://paste.ubuntu.com/p/SwXsCcghjt/

  To recreate with py3.7 you can use Ubuntu Cosmic like so:

  lxc launch ubuntu-daily:cosmic c1
  lxc exec c1 /bin/bash
  root at c1:~# git clone https://github.com/openstack/designate
  root at c1:~# #update tox.ini as shown above
  root at c1:~# tox -e py37

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