alpha and em mtu

[Sten Spans]

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