Date: Fri, 19 Nov 2004 16:01:11 -0500 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-alpha@FreeBSD.org Cc: Robert Watson <rwatson@FreeBSD.org> Subject: Re: alpha and em mtu Message-ID: <200411191601.11773.jhb@FreeBSD.org> In-Reply-To: <Pine.SOC.4.61.0411191013210.8089@tea.blinkenlights.nl> References: <Pine.SOC.4.61.0411142153430.26307@tea.blinkenlights.nl> <Pine.SOC.4.61.0411152236420.1148@tea.blinkenlights.nl> <Pine.SOC.4.61.0411191013210.8089@tea.blinkenlights.nl>
next in thread | previous in thread | raw e-mail | index | archive | help
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 <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 ?
Sorry, been busy recently. A PR certainly wouldn't hurt. Does this panic go
away if you use a different MTU btw?
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200411191601.11773.jhb>