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From: Brian Barrett (brbarret_at_[hidden])
Date: 2007-09-20 21:59:14


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