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Date:      Fri, 07 Dec 2018 13:09:36 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 233535] Machines lost ping6 after adding same IPv6 address
Message-ID:  <bug-233535-7501-KstdTtgwax@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-233535-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-233535-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D233535

Andrey V. Elsukov <ae@FreeBSD.org> changed:

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                 CC|                            |mmacy@FreeBSD.org

--- Comment #8 from Andrey V. Elsukov <ae@FreeBSD.org> ---
(In reply to Slava Shwartsman from comment #7)
> Any updates?

Sorry for long delay, I just tried your test scenario. And I'm able to
reproduce the problem. From a first look, it seems there is some race in
multicast/MLD code. I see that the host, that doesn't respond to ND6 NS, for
each NS packet increments the `ip6s_notmember` counter of ip6 statistics in
icmp6_input(). And ND6 code doesn't have a chance to send a reply.

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