Re: [OMPI devel] Malloc segfaulting?

[George Bosilca]

Tim,




  Thanks,
    george.

On Sep 21, 2007, at 10:07 AM, Tim Prins wrote:

Valgrind will not help ... It can help with double free or things like this, but not with over-running memory that belong to your application. However, in Open MPI we have something that might help you. The option --enable-mem-debug add a unused space at the end of each memory allocation and make sure we don't write anything there. I think this is the simplest way to pinpoint this problem.

Aurelien and Brian.


got (on 2 of 5000 runs):
*** glibc detected *** corrupted double-linked list: 0xf704dff8 ***
on one and
*** glibc detected *** malloc(): memory corruption: 0xeda00c70 ***
on the other.


am attempting to redo the run with valgrind.

Tim

On Thursday 20 September 2007 09:59:14 pm Brian Barrett wrote:

Thanks for the suggestions. I reran the runs with --without-memory- manager and So it looks like somewhere we are over-running our allocated space. So now I

On Sep 20, 2007, at 7:02 AM, Tim Prins wrote:

In our nightly runs with the trunk I have started seeing cases
where we
appear to be segfaulting within/below malloc. Below is a typical
output.

Note that this appears to only happen on the trunk, when we use
openib,
and are in 32 bit mode. It seems to happen randomly at a very low
frequency (59 out of about 60,000 32 bit openib runs).

This could be a problem with our machine, and has showed up since I
started testing 32bit ofed 10 days ago.

Anyways, just curious if anyone had any ideas.

As someone else said, this usually points to a duplicate free or the
like in malloc.  You might want to try compiling with --without-
memory-manager, as the ptmalloc2 in glibc frequently is more verbose
about where errors occurred than is the one in Open MPI.

Brian
_______________________________________________
devel mailing list
de...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/devel

_______________________________________________
devel mailing list
de...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/devel

smime.p7s
Description: S/MIME cryptographic signature