RE: oprofpp crash

[Lluis M. <ll...@se...>]

Hi Phil,

You are right, the binutils version that was installed was the one from
Slackware 8.1, my fault.

I recompiled the binutils package (binutils-2.12.90.0.9) with the patch you
provided and now oprofpp and objdump work fine.

Thanks for your help,

Lluis
.

-----Mensaje original-----
De: Philippe Elie [mailto:ph...@wa...]
Enviado el: martes, 08 de abril de 2003 16:35
Para: Lluis Mora Hidalgo
CC: opr...@li...
Asunto: Re: oprofpp crash


Lluis Mora Hidalgo wrote:
> Hi all,
>
> I have found that oprofpp crashes on my system when trying to get
> information on a binary with debugging information. I have been
> searching the mailing list archives but found no reference to this
> particular problem, so I am hoping you might help find out what is
> happening.
>
> oprofpp output is OK when the program is not compiled with the debugging
> switch, but crashes when run on a program compiled with debugging. Here
> is the output from GDB:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x080685d7 in {anonymous}::interesting_symbol (sym=0x8097f10) at
> op_bfd.cpp:113
> 113             if (!(sym->section->flags & SEC_CODE))



> It seems that the pointer at "sym->section" is invalid, so I guess it
> might be a problem with my installation of libbfd.
>
> I have run it on a few test programs, and it always crashes at the same
> point, so I would say it has nothing to do with the program being
> "profiled".
>
> I am running oprofile on a stock Slackware 8.0 system (i386), with

are you sure it isn't a slack 8.1 ? I run slack 8.1 and get
exactly this compiler binutils version (but a 2.4.20)

> oprofile 0.5.2 (oprofile 0.4 crashes in exactly the same way), GCC is
> 2.95.3 and libbfd is libbfd-2.11.90.0.19. Kernel version is 2.2.20.

try this:

$ objdump --debugging /lib/ld-linux.so.2

if objdump hang you are subject to this bug:

http://sources.redhat.com/ml/binutils/2001-12/msg00372.html

it describe a hang but looking the code I'll be not surprised
if it also allow your behavior. I posted in past the attached
patch to cure this problem. I'm interrested to know if after
applying patch/rebuilding/installing binutils you see always
the hang and the crash. (patch must be applied in
binutils-2.12.90.0.9/binutils sub-dir)


> Is there a "recommended" version of libbfd for oprofile? Does anybody
> have any recommendation on installing a particular version of
> libbfd/libiberty?

If what I suspect is right it's a compiler problem but
patching binutils seems an easier fix you.

I run this binutils version with my patch applied and
never get this problem. If this patch don't work can you
send me a binary and its associated sample file privately
+ the exact command line you use with oprofpp and have you
recompiled some part of your slack with non-default CFLAGS ?

I'll track this problem since someone with another distro
ran into the same problem and I was unable to track it.


regards,
Phil