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[Yun Mao <yunmao@xxxxxxxxx>]

Hi,

we sometimes notice this error message which prevent us from starting
nova services occasionally. We are using a somewhat modified diablo
stable release on Ubuntu 11.10. It may very well be the problem from
our patches but I'm wondering if you guys have any insight. In what
condition does this error occur? There is a similar bug in here:
https://bugs.launchpad.net/nova/+bug/831599

but that doesn't offer much insight to me. Helps are very appreciated. Thanks,

Yun

2012-02-23 16:54:52,788 DEBUG nova.utils
[43f98259-6ba8-4e5d-bc0e-9eab978194e5 None None] backend <module
'nova.db.sqlalchemy.api' from
'/opt/stack/nova/nova/db/sqlalchemy/api.pyc'> from (pid=6385)
__get_backend /opt/stack/nova/nova/utils.py:449
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line
336, in fire_timers
    timer()
  File "/usr/lib/python2.7/dist-packages/eventlet/hubs/timer.py", line
56, in __call__
    cb(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/eventlet/semaphore.py", line
95, in _do_acquire
    waiter.switch()
error: cannot switch to a different thread