From owner-freebsd-alpha@FreeBSD.ORG Mon Nov 15 19:34:52 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 DEDA516A4CE; Mon, 15 Nov 2004 19:34:52 +0000 (GMT) Received: from ford.blinkenlights.nl (ford.blinkenlights.nl [213.204.211.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id 40FF243D31; Mon, 15 Nov 2004 19:34:50 +0000 (GMT) (envelope-from sten@blinkenlights.nl) Received: from tea.blinkenlights.nl (tea.blinkenlights.nl [IPv6:2001:960:301:3:a00:20ff:fe85:fa39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ford.blinkenlights.nl (Postfix) with ESMTP id CC0C63E433; Mon, 15 Nov 2004 20:34:48 +0100 (CET) Received: by tea.blinkenlights.nl (Postfix, from userid 101) id 46AB027D; Mon, 15 Nov 2004 20:34:48 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by tea.blinkenlights.nl (Postfix) with ESMTP id 2E1A1139; Mon, 15 Nov 2004 20:34:48 +0100 (CET) Date: Mon, 15 Nov 2004 20:34:48 +0100 (CET) From: Sten Spans To: John Baldwin In-Reply-To: <200411151111.11950.jhb@FreeBSD.org> Message-ID: References: <200411151111.11950.jhb@FreeBSD.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed cc: Robert Watson cc: freebsd-alpha@FreeBSD.org 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: Mon, 15 Nov 2004 19:34:53 -0000 On Mon, 15 Nov 2004, John Baldwin wrote: > On Sunday 14 November 2004 04:26 pm, Sten Spans wrote: >> I upgraded my ds10 with an intel gigabit card, >> and encountered the following issue (RELENG_5): >> >> deepthought# ifconfig em0 mtu 1501 >> deepthought# >> fatal kernel trap: >> >> trap entry = 0x4 (unaligned access fault) >> faulting va = 0xfffffc001847a02e >> opcode = 0x28 >> register = 0x1 >> pc = 0xfffffc00004cd0f8 >> ra = 0xfffffc00004cce24 >> sp = 0xfffffe00187a9af0 >> curthread = 0xfffffc001f3a70e0 >> pid = 14, comm = swi1: net >> >> [thread 100006] >> Stopped at tcp_input+0x368: srl t0,#0x2,t0 >> db> trace >> tcp_input() at tcp_input+0x368 > > Can you do 'gdb kernel.debug' in your kernel build directory and then do 'l > *tcp_input+0x368' to determine which source line it is panic'ing at? This > might help us figure out what the unaligned access is so it can be fixed. If > you don't have a debug kernel, please build one and reproduce the panic to > get the updated 'tcp_input+0xblah' line and then do the gdb command with the > updated 'tcp_input+0xblah' bit. Thanks. Sure, I anticipated this, but couldn't quite recall how to do the gdb magics :). (gdb) l *tcp_input+0x368 0xfffffc00004cd0f8 is in tcp_input (/usr/src/sys/netinet/tcp_input.c:552). 547 548 /* 549 * Check that TCP offset makes sense, 550 * pull out TCP options and adjust length. XXX 551 */ 552 off = th->th_off << 2; 553 if (off < sizeof (struct tcphdr) || off > tlen) { 554 tcpstat.tcps_rcvbadoff++; 555 goto drop; 556 } The box that talks to the alpha has mtu 9014, this might help to expose the bug. -- Sten Spans "There is a crack in everything, that's how the light gets in." Leonard Cohen - Anthem