Bug 1634164

Summary: fc rescan issue when looking at specific hbas
Product: Red Hat OpenStack Reporter: Alan Bishop <abishop>
Component: python-os-brickAssignee: Alan Bishop <abishop>
Status: CLOSED EOL QA Contact: Tzach Shefi <tshefi>
Severity: medium Docs Contact:
Priority: medium    
Version: 9.0 (Mitaka)CC: aavraham, abishop, apevec, geguileo, joflynn, jschluet, lhh, nlevinki, pmorey, shdunne, svigan, tshefi
Target Milestone: zstreamKeywords: Triaged, ZStream
Target Release: 9.0 (Mitaka)   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: python-os-brick-1.1.0-10.el7ost Doc Type: Bug Fix
Doc Text:
Previously, the os-brick code responsible for scanning FibreChannel HBA hosts returned an invalid value under certain circumstances. As a result of the invalid value, services such as cinder and nova failed. With this update, the FibreChannel HBA scan code always returns a valid value. Cinder and nova no longer crash when scanning FibreChannel HBA hosts.
 Story Points: ---
Clone Of: 1634163
: 1634165 (view as bug list) Environment:
Last Closed: 2019-08-30 14:55:45 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1630842, 1631024, 1634163    
Bug Blocks: 1634165    

Description Alan Bishop 2018-09-28 20:35:13 UTC 
+++ This bug was initially created as a clone of Bug #1634163 +++

+++ This bug was initially created as a clone of Bug #1631024 +++

+++ This bug was initially created as a clone of Bug #1630842 +++

Description of problem:

Volumes fail to attach

Version-Release number of selected component (if applicable):
RHOSP12

Trace:
    2018-09-17 10:11:47.950 95318 INFO oslo.privsep.daemon [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] privsep process running with uid/gid: 0/0
    2018-09-17 10:11:47.952 95318 INFO oslo.privsep.daemon [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] privsep process running with capabilities (eff/prm/inh): CAP_SYS_ADMIN/CAP_SYS_ADMIN/none
    2018-09-17 10:11:47.952 95318 INFO oslo.privsep.daemon [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] privsep daemon running as pid 95318
    2018-09-17 10:11:49.291 1 WARNING nova.volume.cinder [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] The support for the Cinder API v2 is deprecated, please upgrade to Cinder API v3.
    2018-09-17 10:11:52.495 1 INFO os_brick.initiator.connectors.fibre_channel [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] Fibre Channel volume device not yet found. Will rescan & retry.  Try number: 0.
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] Fixed interval looping call 'os_brick.initiator.connectors.fibre_channel._wait_for_device_discovery' failed: TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall Traceback (most recent call last):
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall   File "/usr/lib/python2.7/site-packages/oslo_service/loopingcall.py", line 137, in _run_loop
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall     result = func(*self.args, **self.kw)
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 161, in _wait_for_device_discovery
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall     self._linuxfc.rescan_hosts(hbas, connection_properties)
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall   File "/usr/lib/python2.7/site-packages/os_brick/initiator/linuxfc.py", line 112, in rescan_hosts
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall     for hba_channel, target_id in cts:
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:52.882 1 ERROR oslo.service.loopingcall
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b] Driver failed to attach volume 46ee1840-3cc1-4d12-a827-fbcfea4a824e at /dev/vdb: TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b] Traceback (most recent call last):
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 393, in attach
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     device_type=self['device_type'], encryption=encryption)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1267, in attach_volume
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     self._connect_volume(connection_info, disk_info, instance)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1189, in _connect_volume
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     vol_driver.connect_volume(connection_info, disk_info, instance)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/volume/fibrechannel.py", line 53, in connect_volume
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     device_info = self.connector.connect_volume(connection_info['data'])
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/utils.py", line 137, in trace_logging_wrapper
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return f(*args, **kwargs)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return f(*args, **kwargs)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 169, in connect_volume
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     timer.start(interval=2).wait()
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 121, in wait
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return hubs.get_hub().switch()
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 294, in switch
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return self.greenlet.switch()
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/oslo_service/loopingcall.py", line 137, in _run_loop
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     result = func(*self.args, **self.kw)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 161, in _wait_for_device_discovery
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     self._linuxfc.rescan_hosts(hbas, connection_properties)
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/initiator/linuxfc.py", line 112, in rescan_hosts
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     for hba_channel, target_id in cts:
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b] TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:52.884 1 ERROR nova.virt.block_device [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]
    2018-09-17 10:11:52.887 1 WARNING nova.volume.cinder [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] The support for the Cinder API v2 is deprecated, please upgrade to Cinder API v3.
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b] Failed to attach 46ee1840-3cc1-4d12-a827-fbcfea4a824e at /dev/vdb: TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b] Traceback (most recent call last):
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4939, in _attach_volume
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     do_driver_attach=True)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 45, in wrapped
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     ret_val = method(obj, context, *args, **kwargs)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 402, in attach
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     connector)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     self.force_reraise()
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     six.reraise(self.type_, self.value, self.tb)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 393, in attach
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     device_type=self['device_type'], encryption=encryption)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1267, in attach_volume
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     self._connect_volume(connection_info, disk_info, instance)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1189, in _connect_volume
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     vol_driver.connect_volume(connection_info, disk_info, instance)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/volume/fibrechannel.py", line 53, in connect_volume
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     device_info = self.connector.connect_volume(connection_info['data'])
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/utils.py", line 137, in trace_logging_wrapper
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return f(*args, **kwargs)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return f(*args, **kwargs)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 169, in connect_volume
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     timer.start(interval=2).wait()
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 121, in wait
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return hubs.get_hub().switch()
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 294, in switch
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     return self.greenlet.switch()
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/oslo_service/loopingcall.py", line 137, in _run_loop
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     result = func(*self.args, **self.kw)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 161, in _wait_for_device_discovery
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     self._linuxfc.rescan_hosts(hbas, connection_properties)
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]   File "/usr/lib/python2.7/site-packages/os_brick/initiator/linuxfc.py", line 112, in rescan_hosts
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]     for hba_channel, target_id in cts:
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b] TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:55.823 1 ERROR nova.compute.manager [instance: 87eab092-a72e-4892-a3f3-d6443aaeb87b]
    2018-09-17 10:11:55.825 1 WARNING nova.volume.cinder [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] The support for the Cinder API v2 is deprecated, please upgrade to Cinder API v3.
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server [req-0954fa2d-af1c-4709-8efc-2ee0d814f9e7 8a3500afa82344b29a738db086b4ade7 819e088460f84ab8be9a8cab9b82b735 - default default] Exception during message handling: TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 160, in _process_incoming
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 213, in dispatch
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 183, in _do_dispatch
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 76, in wrapped
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self.force_reraise()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 67, in wrapped
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 218, in decorated_function
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self.force_reraise()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 206, in decorated_function
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4924, in attach_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     do_attach_volume(context, instance, driver_bdm)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4922, in do_attach_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     bdm.destroy()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self.force_reraise()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4919, in do_attach_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return self._attach_volume(context, instance, driver_bdm)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4953, in _attach_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     volume_id=bdm.volume_id)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self.force_reraise()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4939, in _attach_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     do_driver_attach=True)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 45, in wrapped
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     ret_val = method(obj, context, *args, **kwargs)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 402, in attach
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     connector)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self.force_reraise()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/block_device.py", line 393, in attach
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     device_type=self['device_type'], encryption=encryption)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1267, in attach_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self._connect_volume(connection_info, disk_info, instance)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1189, in _connect_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     vol_driver.connect_volume(connection_info, disk_info, instance)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/volume/fibrechannel.py", line 53, in connect_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     device_info = self.connector.connect_volume(connection_info['data'])
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/utils.py", line 137, in trace_logging_wrapper
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 169, in connect_volume
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     timer.start(interval=2).wait()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 121, in wait
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return hubs.get_hub().switch()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 294, in switch
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     return self.greenlet.switch()
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_service/loopingcall.py", line 137, in _run_loop
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     result = func(*self.args, **self.kw)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 161, in _wait_for_device_discovery
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     self._linuxfc.rescan_hosts(hbas, connection_properties)
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/initiator/linuxfc.py", line 112, in rescan_hosts
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server     for hba_channel, target_id in cts:
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server TypeError: 'NoneType' object is not iterable
    2018-09-17 10:11:56.849 1 ERROR oslo_messaging.rpc.server


Seems fixed upstream:
https://review.openstack.org/#/c/589539/

We need to backport it.

Regards,
Pierre-André