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Date:   Mon, 18 Jan 2021 20:02:21 -0800
From:   Jakub Kicinski <>
To:     Enke Chen <>
Cc:     "David S. Miller" <>,
        Alexey Kuznetsov <>,
        Hideaki YOSHIFUJI <>,
        Eric Dumazet <>,
        Yuchung Cheng <>,
        Soheil Hassas Yeganeh <>,
        Neal Cardwell <>,,,
        Jonathan Maxwell <>,
        William McCall <>
Subject: Re: [PATCH net v2] tcp: fix TCP_USER_TIMEOUT with zero window

On Fri, 15 Jan 2021 14:30:58 -0800 Enke Chen wrote:
> From: Enke Chen <>
> The TCP session does not terminate with TCP_USER_TIMEOUT when data
> remain untransmitted due to zero window.
> The number of unanswered zero-window probes (tcp_probes_out) is
> reset to zero with incoming acks irrespective of the window size,
> as described in tcp_probe_timer():
>     RFC 1122 requires the sender to stay open indefinitely
>     as long as the receiver continues to respond probes. We support
>     this by default and reset icsk_probes_out with incoming ACKs.
> This counter, however, is the wrong one to be used in calculating the
> duration that the window remains closed and data remain untransmitted.
> Thanks to Jonathan Maxwell <> for diagnosing the
> actual issue.
> In this patch a new timestamp is introduced for the socket in order to
> track the elapsed time for the zero-window probes that have not been
> answered with any non-zero window ack.
> Fixes: 9721e709fa68 ("tcp: simplify window probe aborting on USER_TIMEOUT")
> Reported-by: William McCall <>
> Co-developed-by: Neal Cardwell <>
> Signed-off-by: Neal Cardwell <>
> Signed-off-by: Enke Chen <>
> Reviewed-by: Yuchung Cheng <>
> Reviewed-by: Eric Dumazet <>

I take it you got all these tags off-list? I don't see them on the v1

Applied to net, thanks!

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