Date: Fri, 19 Nov 2004 10:32:46 +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.4.61.0411191013210.8089@tea.blinkenlights.nl> In-Reply-To: <Pine.SOC.4.61.0411152236420.1148@tea.blinkenlights.nl> References: <Pine.SOC.4.61.0411142153430.26307@tea.blinkenlights.nl> <200411151620.37816.jhb@FreeBSD.org> <Pine.SOC.4.61.0411152236420.1148@tea.blinkenlights.nl>
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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 <t0=0x45>
>
>
> The ip's used are 192.168.1.3 and 192.168.1.4.
Any luck or should I turn this into a pr ?
--
Sten Spans
"There is a crack in everything, that's how the light gets in."
Leonard Cohen - Anthem
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