Re: Hi, Needs suggestions for finding and fixing stack/memory corruption when calling a function

[Mahavir Jain <mjainp@gmail.com>]

On Mon, May 23, 2011 at 8:29 PM, Fawad Lateef <fawadlateef@gmail.com> wrote:
> Hi Andrej,
>
>
> On Mon, May 23, 2011 at 3:45 PM, Andrej Gelenberg
> <andrej.gelenberg@udo.edu> wrote:
>> Hi,
>>
>>
>> heap, stack, buffer overflow? multiple threads? It is bit difficult to
>> suggest something without some code. Have you tried to use gdb or
>> valgrind? (do someone know if valgrind work on arm?)
>>
>
> Thanks for replying.
>
> There is _no_ threading only while(1) loop, we have multiple processes
> communicating through pipes but this problem is happening only in one
> process hence I am assuming that something local to that process is
> corrupting memory.
>
> Our root-filesystem don't have gdb support and I think valgrind is
> _not_ supported on arm :(

Try gdb-server that should fit in small root filesystem.
http://www.delorie.com/gnu/docs/gdb/gdbserver.1.html

>
> Is there any possibility that the problem is related to some compiler
> optimization or something along that line ? We are using gcc-4.2.0
> based tool-chain and Linux kernel 2.6.29.
>
> I can't post the code due to two main reasons: -- Its closed source
> and its too big and I don't think that anyone wants to look at code
> with around 20 cpp files and each file has hundreds of lines of code.
>
> Regards,
>
> Fawad Lateef
>
>> Regards,
>> Andrej Gelenberg
>>
>> On 05/23/2011 04:41 PM, Fawad Lateef wrote:
>>> Hello,
>>>
>>> I need some suggestions about how-to approach, find and fix a memory
>>> corruption issue which is happening in a C/C++ very complex and large
>>> code (code evolved over several years). Code is running on AT91SAM9260
>>> (armv5l architecture; single processor with preemption enabled) and
>>> completely in Linux user-space.
>>>
>>> The problem is:
>>>
>>> -- We are calling a function which has three integer arguments.
>>> With-in that function 2nd and 3rd arguments always gets corrupted
>>> while 1st argument is fine. Just before calling that function printing
>>> arguments is fine.
>>>
>>> Now it will be good if I can get some suggestions about whats
>>> happening and how-to look into this problem. I am thinking that there
>>> is some memory/stack corruption happening somewhere.
>>>
>>> Thanks in advance.
>>>
>>> -- Fawad Lateef
>>> --
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>>
>>
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-- 
Thanks,
MJ
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