From owner-freebsd-current@freebsd.org  Sat Mar  6 09:26:56 2021
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 355D155E8D4
 for <freebsd-current@mailman.nyi.freebsd.org>;
 Sat,  6 Mar 2021 09:26:56 +0000 (UTC) (envelope-from kp@FreeBSD.org)
Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3])
 by mx1.freebsd.org (Postfix) with ESMTP id 4Dszl40qkzz3MQg
 for <freebsd-current@freebsd.org>; Sat,  6 Mar 2021 09:26:56 +0000 (UTC)
 (envelope-from kp@FreeBSD.org)
Received: by mailman.nyi.freebsd.org (Postfix)
 id 1C35555E9E5; Sat,  6 Mar 2021 09:26:56 +0000 (UTC)
Delivered-To: current@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 1BF7155E8D2
 for <current@mailman.nyi.freebsd.org>; Sat,  6 Mar 2021 09:26:56 +0000 (UTC)
 (envelope-from kp@FreeBSD.org)
Received: from smtp.freebsd.org (smtp.freebsd.org
 [IPv6:2610:1c1:1:606c::24b:4])
 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
 key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256
 client-signature RSA-PSS (4096 bits) client-digest SHA256)
 (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 4Dszl40PYbz3M6y;
 Sat,  6 Mar 2021 09:26:56 +0000 (UTC) (envelope-from kp@FreeBSD.org)
Received: from venus.codepro.be (venus.codepro.be [5.9.86.228])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "mx1.codepro.be", Issuer "R3" (verified OK))
 (Authenticated sender: kp)
 by smtp.freebsd.org (Postfix) with ESMTPSA id DA082213F4;
 Sat,  6 Mar 2021 09:26:55 +0000 (UTC) (envelope-from kp@FreeBSD.org)
Received: by venus.codepro.be (Postfix, authenticated sender kp) id 942E94B2A0;
 Sat,  6 Mar 2021 10:26:54 +0100 (CET)
From: "Kristof Provost" <kp@FreeBSD.org>
To: "Alexander V. Chernikov" <melifaro@ipfw.ru>
Cc: "current@FreeBSD.org" <current@freebsd.org>,
 "Bjoern A. Zeeb" <bz@freebsd.org>
Subject: Re: ifa leak on VNET teardown
Date: Sat, 06 Mar 2021 10:26:53 +0100
X-Mailer: MailMate (1.13.2r5673)
Message-ID: <FE498C9E-2C58-4BCF-8B06-961DD722F387@FreeBSD.org>
In-Reply-To: <275831613248826@mail.yandex.ru>
References: <275831613248826@mail.yandex.ru>
MIME-Version: 1.0
Content-Type: text/plain; charset="UTF-8"; format=flowed
Content-Transfer-Encoding: 8bit
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.34
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 06 Mar 2021 09:26:56 -0000

On 13 Feb 2021, at 21:58, Alexander V. Chernikov wrote:
> It turns out we're leaking some ifas for loopback interfaces on VNET 
> teardown:
>
There’s a recent bug about this as well: 253998.
The problem’s been around for a long time though. The pf tests trigger 
it from time to time, although it doesn’t appear to be 100% 
consistent, so my current feeling is that it may be racy.

I see ‘in6_purgeaddr: err=65, destination address delete failed’ 
when we do leak, and I’ve also been able to confirm this is about the 
::1 IPv6 loopback address.

Best regards,
Kristof