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


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