Re: Question about core files

[Manish Katiyar <mkatiyar@gmail.com>]

On Wed, Oct 7, 2009 at 7:51 PM, Holger Kiehl <Holger.Kiehl@dwd.de> wrote:
> Hello Manish
>
> On Wed, 7 Oct 2009, Manish Katiyar wrote:
>
>> Hi Holger,
>>
>> I don't have the source code, so a bit hard to guess. But you can try
>> to find out which member of your fsa structure is at offset 236 (0xec)
>> and look around those lines in the function where you are accessing
>> that member.
>>
>> I am trying to download the AFD source code, which looks like it will
>> take ages on my slow broadband. Hopefully I can help after that.
>>
> If you download, please take afd-1.4.0-0.20.beta.tar.bz2 because that
> is the one that caused the error. You can get it from:
>
>   ftp://ftp.dwd.de/pub/afd/development/afd-1.4.0-0.20.beta.tar.bz2
>
> You will find the relevant code in src/fd.c.

Hi Holger,

(gdb) set $offset = (int)(&((struct filetransfer_status *)0)->host_status)
(gdb) p $offset
$5 = 236
(gdb) p/x 236
$6 = 0xec

host_status is at offset 236. In the function start_process I can see
that this is used at places by dereferencing below
"fsa[fsa_pos].host_status ".

At this point my guess would be that you are getting fsa_pos as
something illegal ie.. probably you are trying to access beyond the
array. Since this is an input to the function, you can just check its
value at the start and assert if that is ok and within reasonable
range.

HTH


>
> Holger
>



-- 
Thanks -
Manish
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