Xen devel - May 2009 - [PATCH] Serialize iptables calls in hotplug scripts

Hi,

iptables cannot correctly handle situations when more than one command is
trying to set netfilter rules. In such situations, iptables may fail with
EAGAIN, which results in iptables: Unknown error 18446744073709551615.

Such situation can easily happen when multiple network devices are configured
for a domain as vif hotplug scripts are called in parallel for all of the
network devices.

Attached is a patch which serializes all iptables calls from vif-* hotplug
scripts...

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>


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