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[OpenStack Infra <1788922@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/596815
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=ecfcf8653815f658c0399b000e9386adc121312b
Submitter: Zuul
Branch:    master

commit ecfcf8653815f658c0399b000e9386adc121312b
Author: Stephen Finucane <sfinucan@xxxxxxxxxx>
Date:   Mon Aug 27 16:28:32 2018 +0100

    privsep: Handle ENOENT when checking for direct IO support
    
    We've seen a recent issue that suggest direct IO support checks can fail
    in other valid ways than EINVAL, namely, failures with ENOENT or the
    FileNotFoundError exception, which is a Python 3-only exception type,
    can occur. While we can't test for this without breaking Python 2.7
    support, we can mimic this by looking for checking for the errno
    attribute of the OSError exception. Do this.
    
    Change-Id: I8aab86bb62cbc8ad538c706af037a30437c7964d
    Closes-Bug: #1788922


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1788922

Title:
  SRIOVServersTest.test_create_server_with_VF intermittently fails due
  to "FileNotFoundError: [Errno 2] No such file or directory:
  '/home/zuul/src/git.openstack.org/openstack/nova/instances/.directio.test'"

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Seen here:

  http://logs.openstack.org/71/594571/2/gate/nova-tox-functional-
  py35/fd2d9ac/testr_results.html.gz

  2018-08-24 16:36:47,192 ERROR [nova.compute.manager] Instance failed to spawn
  Traceback (most recent call last):
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/compute/manager.py", line 2354, in _build_resources
      yield resources
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/compute/manager.py", line 2118, in _build_and_run_instance
      block_device_info=block_device_info)
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/virt/libvirt/driver.py", line 3075, in spawn
      mdevs=mdevs)
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/virt/libvirt/driver.py", line 5430, in _get_guest_xml
      context, mdevs)
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/virt/libvirt/driver.py", line 5216, in _get_guest_config
      flavor, guest.os_type)
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/virt/libvirt/driver.py", line 3995, in _get_guest_storage_config
      inst_type)
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/virt/libvirt/driver.py", line 3903, in _get_guest_disk_config
      self.disk_cachemode,
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/virt/libvirt/driver.py", line 416, in disk_cachemode
      if not nova.privsep.utils.supports_direct_io(CONF.instances_path):
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/privsep/utils.py", line 62, in supports_direct_io
      {'path': dirpath, 'ex': e})
    File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/six.py", line 693, in reraise
      raise value
    File "/home/zuul/src/git.openstack.org/openstack/nova/nova/privsep/utils.py", line 45, in supports_direct_io
      fd = os.open(testfile, os.O_CREAT | os.O_WRONLY | os.O_DIRECT)
  FileNotFoundError: [Errno 2] No such file or directory: '/home/zuul/src/git.openstack.org/openstack/nova/instances/.directio.test'

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22FileNotFoundError%3A%20%5BErrno%202%5D%20No%20such%20file%20or%20directory%3A%20'%2Fhome%2Fzuul%2Fsrc%2Fgit.openstack.org%2Fopenstack%2Fnova%2Finstances%2F.directio.test'%5C%22%20AND%20tags%3A%5C%22console%5C%22&from=7d

  Just started, so it's likely related to these changes:

  https://review.openstack.org/#/c/595802/
  https://review.openstack.org/#/c/407055/

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