[mpich-discuss] Mpich failing electric-fence check

[Matthieu Dorier]

I didn't know electric-fence was so old. 
I managed to find the corruption with valgrind anyway, but it was just in case someone else wanted to use electric-fence.

Matthieu Dorier 
PhD student at ENS Rennes 
http://people.irisa.fr/Matthieu.Dorier 
----- Mail original -----
> De: "Rob Latham" <robl at mcs.anl.gov>
> À: discuss at mpich.org
> Envoyé: Vendredi 7 Mars 2014 16:35:27
> Objet: Re: [mpich-discuss] Mpich failing electric-fence check
> 
> 
> 
> On 03/07/2014 09:25 AM, Jed Brown wrote:
> > Matthieu Dorier <matthieu.dorier at irisa.fr> writes:
> >> ElectricFence Aborting: Allocating 0 bytes, probably a bug.
> >
> > I would argue that ElectricFence is wrong here.  The standard guarantees
> > that malloc(0) succeeds and it is useful to simplify code and to test
> > for matching free in cases where a positive size is rare.
> 
> It wouldn't suprise me to find ElecritcFence buggy.  It was a great tool
> back in the day but Perens stopped maintaining it a decade ago, and
> there seem to be some half-hearted attempts by the community to keep it
> active (debian has some updates from... somewhere.
> http://duma.sourceforge.net/ might work?
> 
> I think everyone around here uses valgrind anyway.
> 
> ==rob
> 
> 
> 
> >
> > C99 §7.20.3: If the size of the space requested is zero, the behavior is
> > implementation-
> > defined: either a null pointer is returned, or the behavior is as if the
> > size were some
> > nonzero value, except that the returned pointer shall not be used to access
> > an object.
> >
> > Either way, the returned pointer can be passed to free.  Are you aware
> > of current malloc implementations which violate the above?
> >
> >
> >
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> 
> --
> Rob Latham
> Mathematics and Computer Science Division
> Argonne National Lab, IL USA
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