(unknown charset) Re: Panic after "in_cksum_skip: out of data by 260"

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

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

From a 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 = 1; apic id = 00
> fault virtual address   = 0xc
> fault code              = supervisor read, page not present
> instruction pointer     = 0x8:0xc066ec33
> stack pointer           = 0x10:0xd5437974
> frame pointer           = 0x10:0xd5437998
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 36 (swi1: net)
> trap number             = 12
> panic: page fault
> cpuid = 1
> boot() called on cpu#0
> Uptime: 1d15h8m10s
>
> This server has been very stable for a very long time. This crash surprises
> 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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-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite_at_gumbysoft.com          |  www.FreeBSD.org