From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Tokarev Subject: Re: r8169: instant crash if receiving packet larger than MTU Date: Tue, 17 Feb 2009 23:55:19 +0300 Message-ID: <499B2437.90400@msgid.tls.msk.ru> References: <4996E054.20905@msgid.tls.msk.ru> <20090217193749.GA12921@electric-eye.fr.zoreil.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev To: Francois Romieu Return-path: Received: from isrv.corpit.ru ([81.13.33.159]:57163 "EHLO isrv.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751706AbZBQU4r (ORCPT ); Tue, 17 Feb 2009 15:56:47 -0500 In-Reply-To: <20090217193749.GA12921@electric-eye.fr.zoreil.com> Sender: netdev-owner@vger.kernel.org List-ID: Francois Romieu wrote: > Michael Tokarev : >> I played with jumbo frames today at home on two >> machines with built-in r8169 NICs. And discovered >> that, after enabling larger packets on one machine, >> it's sufficient to send SINGLE packet to immediately, >> instantly crash the other machine. > > Which size did you use and how did it crash (dead keyboard leds > without any message in the console ?) ? Original interface MTU was unchanged from the default 1500 bytes. The packet I sent was of size 8000 bytes. The crash - one of the machines in question was completely dead, nothing on the console, and dead keyboard leds. Another with the same chip rebooted instantly. /mjt