** Changed in: nova
Importance: Undecided => High
** Also affects: nova/kilo
Importance: Undecided
Status: New
** Changed in: nova/kilo
Status: New => In Progress
** Changed in: nova/kilo
Importance: Undecided => High
** Changed in: nova/kilo
Assignee: (unassigned) => Ihar Hrachyshka (ihar-hrachyshka)
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https://bugs.launchpad.net/bugs/1471916
Title:
race with neutron: can't create bridge with the same name
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) kilo series:
In Progress
Bug description:
If a node running nova-compute is using the neutron with the
linuxbridge agent, and the node is also running other neutron agents
like the l3-agent or dhcp-agent (ie the node is acting as compute node
and a network node) then races can happen when both nova-compute and
the linuxbridge agent try to add the same linux bridge at the same
time. This can cause instances to fail to start.
http://logs.openstack.org/12/138512/10/experimental/check-tempest-
dsvm-neutron-linuxbridge/e737f60/
http://logs.openstack.org/12/138512/10/experimental/check-tempest-
dsvm-neutron-
linuxbridge/e737f60/logs/screen-n-cpu.txt.gz#_2015-07-02_03_09_09_131
The neutron l3-agent added a tap tap device:
2015-07-02 03:09:06.614 DEBUG neutron.agent.linux.utils
[req-42397477-9e58-4c7a-aa0b-8e54269f9d34 None None] Running command (rootwrap
daemon): ['ip', 'link', 'add', 'tapbb2831fd-86', 'type', 'veth', 'peer',
'name', 'qr-bb2831fd-86', 'netns',
'qrouter-048a7c31-08a1-4693-91a8-13e3221c0982'] execute_rootwrap_daemon
/opt/stack/new/neutron/neutron/agent/linux/utils.py:101
Command: ['ip', 'link', 'add', u'tapbb2831fd-86', 'type', 'veth', 'peer',
'name', u'qr-bb2831fd-86', 'netns',
u'qrouter-048a7c31-08a1-4693-91a8-13e3221c0982']
The linuxbridge-agent detects this device and adds the bridge for it's
network:
2015-07-02 03:09:09.119 DEBUG neutron.agent.linux.utils
[req-d4f88282-233b-437e-8157-5d134538d206 None None] Running command (rootwrap
daemon): ['brctl', 'addbr', 'brq94158651-73'] execute_rootwrap_daemon
/opt/stack/new/neutron/neutron/agent/linux/utils.py:101
2015-07-02 03:09:09.122 DEBUG neutron.agent.linux.utils
[req-d4f88282-233b-437e-8157-5d134538d206 None None]
Command: ['brctl', 'addbr', u'brq94158651-73']
Exit code: 0
About the same time, nova-compute also tried to add the same bridge for a VIF
it was about to create on the same network, but lost the race and so the
instance went into an error state:
2015-07-02 03:09:09.130 DEBUG oslo_concurrency.processutils
[req-8391bcc1-bc92-48c7-a635-7e3b2f1af76b
tempest-ServerRescueNegativeTestJSON-1230044074
tempest-ServerRescueNegativeTestJSON-1737504944] CMD "sudo nova-rootwrap
/etc/nova/rootwrap.conf brctl addbr brq94158651-73" returned: 1 in 0.094s exe
cute
/usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:247
2015-07-02 03:09:09.131 DEBUG oslo_concurrency.processutils
[req-8391bcc1-bc92-48c7-a635-7e3b2f1af76b
tempest-ServerRescueNegativeTestJSON-1230044074
tempest-ServerRescueNegativeTestJSON-1737504944] u'sudo nova-rootwrap
/etc/nova/rootwrap.conf brctl addbr brq94158651-73' failed. Not Retrying. execut
e /usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:295
2015-07-02 03:09:09.131 DEBUG oslo_concurrency.lockutils
[req-8391bcc1-bc92-48c7-a635-7e3b2f1af76b
tempest-ServerRescueNegativeTestJSON-1230044074 tem
pest-ServerRescueNegativeTestJSON-1737504944] Lock "lock_bridge" released by
"ensure_bridge" :: held 0.096s inner /usr/local/lib/python2.7/dist-packag
es/oslo_concurrency/lockutils.py:262
2015-07-02 03:09:09.131 ERROR nova.compute.manager
[req-8391bcc1-bc92-48c7-a635-7e3b2f1af76b
tempest-ServerRescueNegativeTestJSON-1230044074 tempest-S
erverRescueNegativeTestJSON-1737504944] [instance:
018793d0-c890-43c7-91ad-5694931cd98c] Instance failed to spawn
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] Traceback (most recent call last):
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/compute/mana
ger.py", line 2113, in _build_resources
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] yield resources
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/compute/mana
ger.py", line 1985, in _build_and_run_instance
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] block_device_info=block_device_info)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/virt/libvirt
/driver.py", line 2435, in spawn
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] block_device_info=block_device_info)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/virt/libvirt
/driver.py", line 4454, in _create_domain_and_network
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] self.plug_vifs(instance, network_info)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/virt/libvirt
/driver.py", line 619, in plug_vifs
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] self.vif_driver.plug(instance, vif)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/virt/libvirt
/vif.py", line 609, in plug
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] func(instance, vif)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/virt/libvirt
/vif.py", line 401, in plug_bridge
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] iface)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py", line
252, in inner
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] return f(*args, **kwargs)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/network/linux_net.py", line 1602, in ensure_bridge
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] _execute('brctl', 'addbr', bridge,
run_as_root=True)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/network/linux_net.py", line 1266, in _execute
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] return utils.execute(*cmd, **kwargs)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/opt/stack/new/nova/nova/utils.py", line 229, in execute
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] return processutils.execute(*cmd,
**kwargs)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] File
"/usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py", line
262, in execute
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] cmd=sanitized_cmd)
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] ProcessExecutionError: Unexpected error
while running command.
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] Command: sudo nova-rootwrap
/etc/nova/rootwrap.conf brctl addbr brq94158651-73
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] Exit code: 1
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] Stdout: u''
2015-07-02 03:09:09.131 5163 ERROR nova.compute.manager [instance:
018793d0-c890-43c7-91ad-5694931cd98c] Stderr: u"device brq94158651-73 already
exists; can't create bridge with the same name\n"
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