Date: Mon, 15 Nov 2004 22:42:03 +0100 (CET) From: Sten Spans <sten@blinkenlights.nl> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-alpha@FreeBSD.org Subject: Re: alpha and em mtu Message-ID: <Pine.SOC.4.61.0411152236420.1148@tea.blinkenlights.nl> In-Reply-To: <200411151620.37816.jhb@FreeBSD.org> References: <Pine.SOC.4.61.0411142153430.26307@tea.blinkenlights.nl> <Pine.SOC.4.61.0411152205370.1075@tea.blinkenlights.nl> <200411151620.37816.jhb@FreeBSD.org>
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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 <t0=0x45>
The ip's used are 192.168.1.3 and 192.168.1.4.
--
Sten Spans
"There is a crack in everything, that's how the light gets in."
Leonard Cohen - Anthem
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