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iptables (since 1.4.20) has a locking mechanism, which prevents multiple instances of the program from running concurrently.

With patch
https://git.netfilter.org/iptables/commit/?id=aaa4ace72ba1d195bbf436134a336816c33f7bd0

we would be able to tell (in firewalld specifically) iptables tool to wait a second (-w1) or two (-w2) when something else like libvirtd (bug #1151067) or docker (bug # 1098281) is calling iptables at the same time (for example when some virtual network device is brought up).

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2103.html