Panic after "in_cksum_skip: out of data by 260"

[Doug White]

On Wed, 13 Apr 2005, Eirik [ISO-8859-1] =D8verby wrote:

> Hi,
>
> Today I received this message on my serial console:
>
> in_cksum_skip: out of data by 260

From=20a brief reading of the source it looks like this is a corrupted mbuf
that got tripped over later.  If you can reproduce this I'd turn the
printf at the end of src/sys/i386/i386/in_cksum.c into a panic and get a
crashdump so the bad data can be analysed.

> Fatal trap 12: page fault while in kernel mode
> cpuid =3D 1; apic id =3D 00
> fault virtual address   =3D 0xc
> fault code              =3D supervisor read, page not present
> instruction pointer     =3D 0x8:0xc066ec33
> stack pointer           =3D 0x10:0xd5437974
> frame pointer           =3D 0x10:0xd5437998
> code segment            =3D base 0x0, limit 0xfffff, type 0x1b
>                         =3D DPL 0, pres 1, def32 1, gran 1
> processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
> current process         =3D 36 (swi1: net)
> trap number             =3D 12
> panic: page fault
> cpuid =3D 1
> boot() called on cpu#0
> Uptime: 1d15h8m10s
>
> This server has been very stable for a very long time. This crash surpris=
es
> me somewhat.
> Uname output:
> FreeBSD carnen.net 5.3-STABLE FreeBSD 5.3-STABLE #0: Wed Feb  2 21:02:44 =
CET
> 2005     root at carnen.net:/usr/obj/usr/src/sys/CARNEN  i386
>
> Any idea what could have caused this?
>
> Thanks,
> /Eirik
>
>
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--=20
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org