Re: [Valgrind-users] Valgrind and User mode Linux

[Matos <aca...@gm...>]

hi,

I followed the wiki instruction on the for the valgrind and the uml. In the
end i got the same assert error.

I used the 2.6.31 kernel and i had to apply manually some patches.
Also for the latest valgrind i applyed some patches manually.

the result is the same as before read elf asser error.

Have a look at the logs:
########################## begin
edemaan@test-linux:~/kernel/uml_build$ export
VALGRIND_LAUNCHER=valgrind/coregrind/valgrind
edemaan@test-linux:~/kernel/uml_build$

edemaan@test-linux:~/kernel/uml_build$
./valgrind/valgrind-3.5.0/.in_place/memcheck-x86-linux
./uml_with_valgrind/linux-2.6.31/linux

==13100== Memcheck, a memory error
detector

==13100== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et
al.
==13100== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright
info
==13100== Command:
./uml_with_valgrind/linux-2.6.31/linux

==13100==

valgrind: m_debuginfo/readelf.c:1317 (vgModuleLocal_read_elf_debug_info):
Assertion 'rw_svma_limit != 0' failed.
==13100==    at 0x38027410: ??? (in
/home/edemaan/kernel/uml_build/valgrind/valgrind-3.5.0/memcheck/memcheck-x86-linux)

sched status:
  running_tid=0


Note: see also the FAQ in the source distribution.
It contains workarounds to several common problems.
In particular, if Valgrind aborted or crashed after
identifying problems in your program, there's a good chance
that fixing those problems will prevent Valgrind aborting or
crashing, especially if it happened in m_mallocfree.c.

If that doesn't help, please report this bug to: www.valgrind.org

In the bug report, send all the above text, the valgrind
version, and what OS and version you are using.  Thanks.

edemaan@test-linux:~/kernel/uml_build$

########################## end


I guess i am missing some config in the kernel build. Could that be?

Hope you guys can give a hint :)

thanks

André

On Fri, Feb 19, 2010 at 2:44 PM, Dan Kegel <da...@ke...> wrote:

> On Fri, Feb 19, 2010 at 12:55 AM, Matos <aca...@gm...> wrote:
> >  I built kernel in usermode and i get an executable.
> >
> >  Now i wanted to use valgrind to do memory check to this executable.
> >
> >  But as soon run it i get an error. I googled it but i do not get much.
>
> Did you see
> http://uml.harlowhill.com/uml/Wiki.jsp?page=ValgrindingUML
> ?  That might help.  You need to rebuild valgrind and uml with
> a set of patches.
> - Dan
>