** No longer affects: nova/diablo
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https://bugs.launchpad.net/bugs/907125
Title:
nova-api throws "lazy load operation of attribute 'network' cannot
proceed" under stress
Status in OpenStack Compute (Nova):
Invalid
Bug description:
Test Environment:
Nova stable/diablo (d3f32f742c1622f2d8b4b6fc5f42b04ea5da5664) on 2
machines. Launch 20 VMs (in parallel) at a time take them down and
launch another 20.
Error:
When run euca-describe-instances during and after the VM launch
process it occasionally says
# euca-describe-instances
UnknownError: An unknown error has occurred. Please try your request again.
"Parent instance <FixedIp at 0x5dd6390> is not bound to a Session;
lazy load operation of attribute 'network' cannot proceed"
This error is similar to Bug #785816 and Bug #815957
StackTrace (from nova-api.log)
2011-12-20 13:07:33,881 ERROR nova.api [69c94d83-24fc-403c-b550-ac528ac80414
nova project_503] Unexpected error raised: Parent instance <FixedIp at
0x5dd6390> is not bound to a Session; lazy load operation of attribute
'network' cannot proceed
(nova.api): TRACE: Traceback (most recent call last):(nova.api): TRACE:
File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/__init__.py", line
348, in __call__
(nova.api): TRACE: result = api_request.invoke(context)(nova.api): TRACE:
File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/apirequest.py",
line 78, in invoke
(nova.api): TRACE: result = method(context, **args)
(nova.api): TRACE: File
"/usr/local/lib/python2.7/dist-packages/nova/api/ec2/cloud.py", line 1152, in
describe_instances
(nova.api): TRACE: instance_id=instance_id)(nova.api): TRACE: File
"/usr/local/lib/python2.7/dist-packages/nova/api/ec2/cloud.py", line 1161, in
_format_describe_instances
(nova.api): TRACE: return {'reservationSet':
self._format_instances(context, **kwargs)}
(nova.api): TRACE: File
"/usr/local/lib/python2.7/dist-packages/nova/api/ec2/cloud.py", line 1266, in
_format_instances(nova.api): TRACE: if fixed['network'] and use_v6:
(nova.api): TRACE: File
"/usr/local/lib/python2.7/dist-packages/nova/db/sqlalchemy/models.py", line 76,
in __getitem__(nova.api): TRACE: return getattr(self, key)
(nova.api): TRACE: File
"/usr/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 163, in
__get__
(nova.api): TRACE: instance_dict(instance))
(nova.api): TRACE: File
"/usr/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 383, in
get
(nova.api): TRACE: value = callable_(passive=passive)
(nova.api): TRACE: File
"/usr/lib/python2.7/dist-packages/sqlalchemy/orm/strategies.py", line 595, in
__call__
(nova.api): TRACE: (mapperutil.state_str(state), self.key)(nova.api):
TRACE: DetachedInstanceError: Parent instance <FixedIp at 0x5dd6390> is not
bound to a Session; lazy load operation of attribute 'network' cannot
proceed(nova.api): TRACE:
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