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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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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