From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: GRO + splice panics in 3.7.0-rc5 Date: Thu, 15 Nov 2012 15:49:04 -0800 Message-ID: <1353023344.10798.8.camel@edumazet-glaptop> References: <20121115222812.GA647@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Willy Tarreau Return-path: Received: from mail-da0-f46.google.com ([209.85.210.46]:43059 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751456Ab2KOXtG (ORCPT ); Thu, 15 Nov 2012 18:49:06 -0500 Received: by mail-da0-f46.google.com with SMTP id n41so882812dak.19 for ; Thu, 15 Nov 2012 15:49:06 -0800 (PST) In-Reply-To: <20121115222812.GA647@1wt.eu> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, 2012-11-15 at 23:28 +0100, Willy Tarreau wrote: > Hello, > > I was just about to make a quick comparison between LRO and GRO in > 3.7.0-rc5 to see if LRO still had the big advantage I've always observed, > but I failed the test because as soon as I enable LRO + splice, the kernel > panics and reboots. > > I could not yet manage to catch the panic output, I could just reliably > reproduce it, it crashes instantly. > > All I can say at the moment is the following : > - test consist in forwarding HTTP traffic between two NICs via haproxy > - driver used was myri10ge > - LRO + recv+send : OK > - LRO + splice : OK > - GRO + recv+send : OK > - GRO + splice : panic > - no such problem was observed in 3.6.6 so I think this is a recent > regression. > > I'll go back digging for more information, but as I'm used to often see > Eric suggest the right candidates for reverting, I wanted to report the > issue here in case there are easy ones to try first. Hi Willy Nothing particular comes to mind, there were a lot of recent changes that could trigger this kind of bug. A stack trace would be useful of course ;)