Received-SPF: pass (google.com: domain of linux-kernel+bounces-9745-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Date: Fri, 22 Dec 2023 20:22:55 +0700
From: Bagas Sanjaya <bagasdotme@gmail.com>
To: Dan Moulding <dan@danm.net>
Cc: Alex Henrie <alexhenrie24@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	David Ahern <dsahern@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Regressions <regressions@lists.linux.dev>
Subject: Re: [REGRESSION] net/ipv6/addrconf: Temporary addresses with short
 lifetimes generating when they shouldn't, causing applications to fail
Message-ID: <ZYWNr_4P-je2uVDe@archie.me>
References: <20231221231115.12402-1-dan@danm.net>
Precedence: bulk
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
	protocol="application/pgp-signature"; boundary="Vni8xhQwWxIq5ZfM"
Content-Disposition: inline
In-Reply-To: <20231221231115.12402-1-dan@danm.net>


--Vni8xhQwWxIq5ZfM
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Thu, Dec 21, 2023 at 04:10:57PM -0700, Dan Moulding wrote:
> I started running v6.7-rc5 on a desktop and began having problems
> where Chromium would frequently fail to load pages and give an
> "ERR_NETWORK_CHANGED" message instead. I also noticed instability in
> avahi-daemon (it would stop resolving local names and/or consume 100%
> CPU). Eventually I discovered that what is happening is that new
> temporary IPv6 addresses for a ULA address are being generated once
> every second, with very short preferred lifetimes (and I had an
> interface with thousands of such temporary addresses). I also found
> that it seems to be triggered when one of the devices on the network
> sends a router advertisement with a prefix that has a preferred
> lifetime of 0 (presumably it's sending that because it wants to
> deprecate that prefix).
>=20
> I bisected it to commit 629df6701c8a ("net: ipv6/addrconf: clamp
> preferred_lft to the minimum required"). Upon reviewing that change, I
> see that it has changed when generation of temporary addresses will be
> allowed. I believe that change might have inadvertently caused the
> kernel to violate RFC 4941 and might need to be reverted.

Can you verify that by actually reverting 629df6701c8a91 on top of net
tree?

--=20
An old man doll... just what I always wanted! - Clara

--Vni8xhQwWxIq5ZfM
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iHUEABYKAB0WIQSSYQ6Cy7oyFNCHrUH2uYlJVVFOowUCZYWNrAAKCRD2uYlJVVFO
oxAMAP9lltebRi7sgtxnXr9tOtoEH00eLNEKjA5Xx/oeq4m7cQD+PrCMNymm/dwF
wf9vH36BMIISVma6/Mlh804YTHD2DgQ=
=H5nD
-----END PGP SIGNATURE-----

--Vni8xhQwWxIq5ZfM--