Unfortunately this is a known issue.  We're working on a fix:
https://bugs.launchpad.net/oslo/+bug/1327946

On 08/07/2014 03:57 AM, Alex Xu wrote:
> When I startup nova-network, it stuck at trying get lock for ebtables.
> 
> @utils.synchronized('ebtables', external=True)
> def ensure_ebtables_rules(rules, table='filter'):
>      .....
> 
> Checking the code found that invoke utils.synchronized without parameter 
> lock_path, the code will try to use
> posix semaphore.
> 
> But posix semaphore won't release even the process crashed. Should we 
> fix it? I saw a lot of call for synchronized
> without lock_path.
> 
> Thanks
> Alex
> 
> 
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev@lists.openstack.org
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> 


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