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We encountered a situation where concurrent invocations of the docker daemon on a machine with an older version of iptables led to nondeterministic errors related to simultaenous invocations of iptables. While this is best resolved by upgrading iptables itself, the particular situation would have been avoided if the docker daemon simply took care not to concurrently invoke iptables. Of course, external processes could also cause iptables to fail in this way, but invoking docker in parallel seems like a pretty common case. Signed-off-by: Aaron Davidson <aaron@databricks.com> Upstream-commit: c271c61feea7d3ea3fcbb3af9f0d9c1f641a8d82 Component: engine