netdev - Re: [PATCH v2] net: ipv6: Always leave anycast and multicast groups on link down

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Date:	Mon, 25 Jul 2016 11:17:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mmanning@...cade.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: ipv6: Always leave anycast and multicast
 groups on link down 

From: Mike Manning <mmanning@...cade.com>
Date: Fri, 22 Jul 2016 18:32:11 +0100

> Default kernel behavior is to delete IPv6 addresses on link
> down, which entails deletion of the multicast and the
> subnet-router anycast addresses. These deletions do not
> happen with sysctl setting to keep global IPv6 addresses on
> link down, so every link down/up causes an increment of the
> anycast and multicast refcounts. These bogus refcounts may
> stop these addrs from being removed on subsequent calls to
> delete them. The solution is to leave the groups for the
> multicast and subnet anycast on link down for the callflow
> when global IPv6 addresses are kept.
> 
> Fixes: f1705ec197e7 ("net: ipv6: Make address flushing on ifdown optional")
> Signed-off-by: Mike Manning <mmanning@...cade.com>

Applied and queued up for -stable, thanks.