netdev - Re: Recurring trace from tcp

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Message-ID: <CADVnQyngTDVYMhmQq=pjS3LrdQ+HXyizujiOkmgXxTjQ0QKH8A@mail.gmail.com>
Date:	Fri, 29 May 2015 15:46:43 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Grant Zhang <gzhang@...tly.com>
Cc:	Netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: Recurring trace from tcp_fragment()

On Fri, May 29, 2015 at 3:21 PM, Grant Zhang <gzhang@...tly.com> wrote:
> We have multiple machines running into the following trace repeatedly. The trace shows up every couple of seconds on our production machines.
>
...
> May 29 18:14:04 cache-fra1230 kernel:[3080455.796188]  [<ffffffff81678174>] tcp_fragment+0x2e4/0x2f0
> May 29 18:14:04 cache-fra1230 kernel:[3080455.796191]  [<ffffffff8166edeb>] tcp_mark_head_lost+0xeb/0x290
> May 29 18:14:04 cache-fra1230 kernel:[3080455.796193]  [<ffffffff8166fe28>] tcp_update_scoreboard+0x58/0x90
> May 29 18:14:04 cache-fra1230 kernel:[3080455.796195]  [<ffffffff8167422d>] tcp_fastretrans_alert+0x75d/0xb30
> May 29 18:14:04 cache-fra1230 kernel:[3080455.796197]  [<ffffffff816750d5>] tcp_ack+0xa15/0xf50

I'm glad you are seeing this so often. :-) We see this warning too,
but only very occasionally.

Our team has a proposed fix, but we have so far been unable to test it
thoroughly since it happens so rarely in our environment. Would you be
willing to test a small patch aimed at fixing this warning?

neal
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