linux-kernel - Re: [PATCH] net: core: fix SO_TIMESTAMP

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Date:   Wed, 7 Jul 2021 14:32:01 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Sergei Trofimovich <slyfox@...too.org>
Cc:     netdev <netdev@...r.kernel.org>, Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH] net: core: fix SO_TIMESTAMP_* option setting

On Wed, Jul 7, 2021 at 11:27 AM Sergei Trofimovich <slyfox@...too.org> wrote:
>
> I noticed the problem as a systemd-timesyncd (and ntpsec) sync failures:
>
>     systemd-timesyncd[586]: Timed out waiting for reply from ...
>     systemd-timesyncd[586]: Invalid packet timestamp.
>
> Bisected it down to commit 371087aa476
> ("sock: expose so_timestamp options for mptcp").
>
> The commit should be a no-op but it accidentally reordered option type
> and option value:
>
>     +void sock_set_timestamp(struct sock *sk, int optname, bool valbool);
>     ...
>     -     __sock_set_timestamps(sk, valbool, true, true);
>     +     sock_set_timestamp(sk, valbool, optname);
>
> Tested the fix on systemd-timesyncd. The sync failures went away.
>
> CC: Paolo Abeni <pabeni@...hat.com>
> CC: Florian Westphal <fw@...len.de>
> CC: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> CC: David S. Miller <davem@...emloft.net>
> CC: Jakub Kicinski <kuba@...nel.org>
> CC: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Sergei Trofimovich <slyfox@...too.org>
> ---

I think this has been fixed five days ago in

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=81b4a0cc7565b08cadd0d02bae3434f127d1d72a