[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]
** Changed in: nova
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1971760
Title:
nova-compute leaks green threads
Status in OpenStack Compute (nova):
Expired
Bug description:
At the moment, if the cloud sustain a large number of VIF plugging
timeouts, it will lead into a ton of leaked green threads which can
cause the nova-compute process to stop reporting/responding.
The tracebacks that would occur would be:
===
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] Traceback (most recent call last):
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/nova/virt/libvirt/driver.py",
line 7230, in _create_guest_with_network
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] guest = self._create_guest(
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/usr/lib/python3.8/contextlib.py", line 120, in __exit__
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] next(self.gen)
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/nova/compute/manager.py", line
479, in wait_for_instance_event
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] actual_event = event.wait()
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/eventlet/event.py", line 125,
in wait
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] result = hub.switch()
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/eventlet/hubs/hub.py", line
313, in switch
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] return self.greenlet.switch()
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] eventlet.timeout.Timeout: 300 seconds
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b]
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] During handling of the above exception,
another exception occurred:
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b]
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] Traceback (most recent call last):
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/nova/compute/manager.py", line
2409, in _build_and_run_instance
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] self.driver.spawn(context, instance,
image_meta,
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/nova/virt/libvirt/driver.py",
line 4193, in spawn
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] self._create_guest_with_network(
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] File
"/var/lib/openstack/lib/python3.8/site-packages/nova/virt/libvirt/driver.py",
line 7256, in _create_guest_with_network
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b] raise
exception.VirtualInterfaceCreateException()
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b]
nova.exception.VirtualInterfaceCreateException: Virtual Interface creation
failed
2022-04-17 00:21:28.651 877893 ERROR nova.compute.manager [instance:
0c0d2422-781c-4bd2-b6bd-e5e3c94b602b]
===
Eventually, with enough of these, the nova-compute process would hang.
The output of GMR shows nearly 6094 threads, with around 3038 of them
having the traceback below:
===
------ Green Thread ------
/var/lib/openstack/lib/python3.8/site-packages/eventlet/hubs/hub.py:355 in run
`self.fire_timers(self.clock())`
/var/lib/openstack/lib/python3.8/site-packages/eventlet/hubs/hub.py:476 in
fire_timers
`timer()`
/var/lib/openstack/lib/python3.8/site-packages/eventlet/hubs/timer.py:59 in
__call__
`cb(*args, **kw)`
/var/lib/openstack/lib/python3.8/site-packages/eventlet/hubs/__init__.py:151
in _timeout
`current.throw(exc)`
===
In addition, 3039 of those threads would output the following:
===
------ Green Thread ------
No Traceback!
===
In total, that puts 6077 green threads in total with that weird state.
We've had a discussion about this here, and it seems that it may be
related to the use of `spawn_n`.
https://meetings.opendev.org/irclogs/%23openstack-nova/%23openstack-
nova.2022-05-05.log.html#t2022-05-05T16:20:37
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