From owner-freebsd-alpha@FreeBSD.ORG Fri Nov 19 21:53:44 2004 Return-Path: Delivered-To: freebsd-alpha@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B817416A4CE for ; Fri, 19 Nov 2004 21:53:44 +0000 (GMT) Received: from mail6.speakeasy.net (mail6.speakeasy.net [216.254.0.206]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6E0F143D39 for ; Fri, 19 Nov 2004 21:53:44 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: (qmail 28058 invoked from network); 19 Nov 2004 21:53:44 -0000 Received: from dsl027-160-063.atl1.dsl.speakeasy.net (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender ) encrypted SMTP for ; 19 Nov 2004 21:53:43 -0000 Received: from [10.50.41.235] (gw1.twc.weather.com [216.133.140.1]) (authenticated bits=0) by server.baldwin.cx (8.12.11/8.12.11) with ESMTP id iAJLrVcU007881; Fri, 19 Nov 2004 16:53:40 -0500 (EST) (envelope-from jhb@FreeBSD.org) From: John Baldwin To: freebsd-alpha@FreeBSD.org Date: Fri, 19 Nov 2004 16:01:11 -0500 User-Agent: KMail/1.6.2 References: In-Reply-To: MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200411191601.11773.jhb@FreeBSD.org> X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on server.baldwin.cx cc: Robert Watson Subject: Re: alpha and em mtu X-BeenThere: freebsd-alpha@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the Alpha List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Nov 2004 21:53:44 -0000 On Friday 19 November 2004 04:32 am, Sten Spans wrote: > On Mon, 15 Nov 2004, Sten Spans wrote: > > On Mon, 15 Nov 2004, John Baldwin wrote: > >> On Monday 15 November 2004 04:07 pm, Sten Spans wrote: > >>> On Mon, 15 Nov 2004, John Baldwin wrote: > >>> > >>> changed to ((off0 & 0x3) != 0), didn't seem to print anything. > >> > >> Ok, try this one then instead: > >> > >> Index: netinet/tcp_input.c > >> =================================================================== > >> RCS file: /usr/cvs/src/sys/netinet/tcp_input.c,v > >> retrieving revision 1.255 > >> diff -u -r1.255 tcp_input.c > >> --- netinet/tcp_input.c 7 Nov 2004 19:19:35 -0000 1.255 > >> +++ netinet/tcp_input.c 15 Nov 2004 21:19:50 -0000 > >> @@ -504,6 +504,8 @@ > >> } > >> } > >> ip = mtod(m, struct ip *); > >> + if (((uintptr_t)ip & 0x3) != 0) > >> + printf("%s: ip %p is misaligned\n", __func__, ip); > >> ipov = (struct ipovly *)ip; > >> th = (struct tcphdr *)((caddr_t)ip + off0); > >> tlen = ip->ip_len; > > > > This does print something: > > deepthought# ifconfig em0 mtu 1501 > > deepthought# tcp_input: ip 0xfffffc001817f00e is misaligned > > > > fatal kernel trap: > > > > trap entry = 0x4 (unaligned access fault) > > faulting va = 0xfffffc001817f02e > > opcode = 0x28 > > register = 0x1 > > pc = 0xfffffc00004cd134 > > ra = 0xfffffc00004ccf94 > > sp = 0xfffffe00187a9af0 > > curthread = 0xfffffc001f3a70e0 > > pid = 14, comm = swi1: net > > > > [thread 100006] > > Stopped at tcp_input+0x3a4: srl t0,#0x2,t0 > > > > > > The ip's used are 192.168.1.3 and 192.168.1.4. > > Any luck or should I turn this into a pr ? Sorry, been busy recently. A PR certainly wouldn't hurt. Does this panic go away if you use a different MTU btw? -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org