From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: WARN_ON in TLP causing RT throttling Date: Thu, 27 Sep 2018 17:25:53 -0700 Message-ID: <7e05c738-8188-8cae-a726-33f780f6b05f@gmail.com> References: <7aa9932a59aad7a21c7f8a8146dd0542@codeaurora.org> <3c112d25-1105-524f-e210-8a7cb63df1c7@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: Eric Dumazet , soheil@google.com, netdev@vger.kernel.org To: stranche@codeaurora.org, Yuchung Cheng Return-path: Received: from mail-pf1-f176.google.com ([209.85.210.176]:40097 "EHLO mail-pf1-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726081AbeI1Gqx (ORCPT ); Fri, 28 Sep 2018 02:46:53 -0400 Received: by mail-pf1-f176.google.com with SMTP id s5-v6so3020896pfj.7 for ; Thu, 27 Sep 2018 17:25:56 -0700 (PDT) In-Reply-To: Content-Language: en-US Sender: netdev-owner@vger.kernel.org List-ID: On 09/27/2018 05:16 PM, stranche@codeaurora.org wrote: > Hi Yuchung, > > Based on the dumps we were able to get, it appears that TFO was not used in this case. > We also tried some local experiments where we dropped incoming SYN packets after already > successful TFO connections on the receive side to see if TFO would trigger this scenario, but > have not been able to reproduce it. > > One other interesting thing we found is that the socket never sent or received any data. It only > sent/received the packets for the initial handshake and the outgoing FIN. Just to make sure : Was this some sort of syzkaller (or other fuzzer) run ?