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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-09-25 07:20:47


Thanks for the bug report, Yvan. I've filed https://svn.open-mpi.org/
trac/ompi/ticket/1149 about it.

George (the datatypes guy) is off on vacation this week and will be
at Euro PVM/MPI next week. Hopefully he'll be able to look at this
soon.

On Sep 24, 2007, at 5:27 PM, Yvan Fournier wrote:

> Hello,
>
> I seem to have encountered a new bug in Open MPI 1.2.3 using indexed
> datatypes with MPI_Recv (which seems to be of the "off by one" sort).
> I have (different from the bug I submitted in 2006 and which was
> corrected since).
>
> This bug leads to a segfault, and I have only encountered it one
> one data set (on a relatively large set for a 2-processor run).
> I have reproduced the segfault on 2 different linux Systems
> (Debian Sarge on dual-processor Intel Xeon, Kubuntu 7.04
> on single-processor Centrino system).
>
> A means to reproduce it on 2 ranks can be found at :
> http://yvan.fournier.free.fr/OpenMPI/ompi_datatype_bug_2.tar.gz
>
> (the program is very simple, but the displacements array required to
> reproduce it is too large for the mailing list).
>
> The program does not print any output, but does not segfault when
> functioning properly, or when USE_INDEXED_DATATYPE is unset (lines
> 57-58). It works with LAM 7.1.1 and MPICH2, but fails under Open MPI.
> This is a (much) simplified extract from a part of Code_Saturne's
> FVM library (http://rd.edf.com/code_saturne/), which otherwise works
> fine on most data using Open MPI.
>
> Best regards,
>
> Yvan Fournier
>
>
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-- 
Jeff Squyres
Cisco Systems