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[Pádraig Brady <P@xxxxxxxxxxxxxx>]

On 12/24/2011 03:47 AM, darkfower wrote:
> hi,everybody:
> 
>     when i  new create a kvm instance , error as flollow:
> 
> 
> 2011-12-24 11:45:17,937 INFO nova.virt.libvirt_conn [-] Instance instance-00000001 spawned successfully.
> 2011-12-24 11:45:18,126 ERROR nova.exception [-] DB exception wrapped.
> (nova.exception): TRACE: Traceback (most recent call last):
> (nova.exception): TRACE:   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 78, in _wrap
> (nova.exception): TRACE:     return f(*args, **kwargs)
> (nova.exception): TRACE:   File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1359, in flush
> (nova.exception): TRACE:     self._flush(objects)
> (nova.exception): TRACE:   File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1447, in _flush
> (nova.exception): TRACE:     raise
> (nova.exception): TRACE: TypeError: exceptions must be old-style classes or derived from BaseException, not NoneType
> (nova.exception): TRACE: 
> 2011-12-24 11:45:18,140 WARNING nova.compute.manager [-] Error during power_state sync: exceptions must be old-style classes or derived from BaseException, not NoneType

I've seen this due to greenthread clearing the exception,
thus None is reraised, rather than the original exception.
nova.utils.save_and_reraise_exception() was created to avoid this,
so perhaps there is a missing use of this?

cheers,
Pádraig.