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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC] net: ipv4 -- Introduce ifa limit per net
Date: Wed, 09 Mar 2016 16:10:38 -0500 (EST)
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From: Cyrill Gorcunov <gorcunov@gmail.com>
Date: Wed, 9 Mar 2016 23:57:47 +0300

> Aha! So in your patch __inet_del_ifa bypass first blocking_notifier_call_chain
> 
> __inet_del_ifa
> 	...
> 	if (in_dev->dead)
> 		goto no_promotions;
> 
> 	// First call to NETDEV_DOWN
> ...
> no_promotions:
> 	rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
> 	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
> 
> and here we call for NETDEV_DOWN, which then hits masq_device_event
> and go further to conntrack code.

Yes that's where the notifier comes from, which happens with or without
my patch.