Thanks for the report -- I've filed 
https://svn.open-mpi.org/trac/ompi/ticket/2405.

On May 5, 2010, at 8:17 PM, Lisandro Dalcin wrote:

> After building 1.4.2 with debug flags to configure, I get this (I've
> got these warnings in previous releases, too):
> 
> malloc debug: Request for 0 bytes (coll_inter_gatherv.c, 94)
> malloc debug: Request for 0 bytes (coll_inter_gatherv.c, 94)
> malloc debug: Request for 0 bytes (coll_inter_gatherv.c, 94)
> malloc debug: Request for 0 bytes (coll_inter_gatherv.c, 94)
> 
> malloc debug: Request for 0 bytes (coll_inter_scatterv.c, 82)
> malloc debug: Request for 0 bytes (coll_inter_scatterv.c, 82)
> malloc debug: Request for 0 bytes (coll_inter_scatterv.c, 82)
> malloc debug: Request for 0 bytes (coll_inter_scatterv.c, 82)
> 
> 
> --
> Lisandro Dalcin
> ---------------
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