** Changed in: nova
Status: Confirmed => Won't Fix
** Tags removed: liberty-backport-potential
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https://bugs.launchpad.net/bugs/1466696
Title:
Cells: Race between instance 'unlock' and 'stop' can cause 'stop' to
fail
Status in OpenStack Compute (nova):
Won't Fix
Bug description:
Observed in the tempest-dsvm-cells job during
tempest.api.compute.servers.test_server_actions.ServerActionsTestJSON.test_lock_unlock_server
The test locks an instance, attempts to stop it, makes sure that
fails, unlocks it, attempts to stop it, and makes sure that succeeds.
The problem happens during the succession of actions "unlock" and
"stop". The "unlock" does an instance.save() of the locked state at
the top cell which will sync to the child. If the "stop" request
reaches the child cell before the instance.save() state locked = False
syncs to the child cell, the "stop" will fail with the following trace
in screen-n-cell-child.txt:
2015-06-18 19:09:23.852 ERROR nova.cells.messaging
[req-6b3584bb-b52a-41ba-8e88-000e14ba6ec6 ServerActionsTestJSON-1466672685
ServerActionsTestJSON-639331338] Error processing message locally
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging Traceback (most
recent call last):
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging File
"/opt/stack/new/nova/nova/cells/messaging.py", line 200, in _process_locally
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging resp_value =
self.msg_runner._process_message_locally(self)
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging File
"/opt/stack/new/nova/nova/cells/messaging.py", line 1256, in
_process_message_locally
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging return
fn(message, **message.method_kwargs)
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging File
"/opt/stack/new/nova/nova/cells/messaging.py", line 850, in stop_instance
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging
clean_shutdown=clean_shutdown)
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging File
"/opt/stack/new/nova/nova/cells/messaging.py", line 839, in
_call_compute_api_with_obj
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging return fn(ctxt,
instance, *args, **kwargs)
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging File
"/opt/stack/new/nova/nova/compute/api.py", line 214, in inner
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging raise
exception.InstanceIsLocked(instance_uuid=instance.uuid)
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging InstanceIsLocked:
Instance cb2485ba-e3e5-4668-869b-f145e5f28a1a is locked
2015-06-18 19:09:23.852 16161 ERROR nova.cells.messaging
Logstash query: message:"InstanceIsLocked" AND tags:"screen-n-cell-
child.txt"
http://logstash.openstack.org/#eyJzZWFyY2giOiJtZXNzYWdlOlwiSW5zdGFuY2VJc0xvY2tlZFwiIEFORCB0YWdzOlwic2NyZWVuLW4tY2VsbC1jaGlsZC50eHRcIiIsImZpZWxkcyI6W10sIm9mZnNldCI6MCwidGltZWZyYW1lIjoiNjA0ODAwIiwiZ3JhcGhtb2RlIjoiY291bnQiLCJ0aW1lIjp7InVzZXJfaW50ZXJ2YWwiOjB9LCJzdGFtcCI6MTQzNDY3NDMyOTQ0Mn0=
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