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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2006-03-04 14:24:36

On Mar 3, 2006, at 9:07 AM, Jose Pedro Garcia Mahedero wrote:

> cluster master machine
> eth0 mpihosts_out --> for outside use (getting its own ip via dhcp)
> eth1, mpihosts_cluster --> for cluster use (serves ip's to
> cluster nodes)
> ------- TESTS 1,2 -openmpi-1.0.2a9 ------
> 1.- cd openmpi-1.0.1
> 2.- make clean
> 3.- cd openmpi-1.0.2a9
> 4.- ./configure
> 5.- make all install
> no parameters /usr/local/etc/openmpi-mca-params.conf
> mpirun -np 2 --hostfile mpihosts_cluster ping_pong
> mpirun -np 2 --hostfile mpihosts_out ping_pong
> GIve the same results:
> Signal:11 info.si_errno:0 (Success) si_code:1(SEGV_MAPERR)
> Failing at addr:0x6
> *** End of error message ***
> [0] func:/usr/local/lib/ [0x40101cb2]
> [1] func:[0xffffe440]
> [2] func:/usr/local/lib/openmpi/ [0x404541d6]
> [3] func:/usr/local/lib/openmpi/
> +0x149) [0x404502f9]

Yoinks -- whatever we do, we should not be seg faulting. :-( It is
apparently dying in the mca_btl_tcp_add_procs() function, which is
where we're creating MPI networking mappings from one TCP peer to

I am unable to repeat this error (I tried it on a cluster with a
similar setup to yours). Can you recompile the TCP BTL with
debugging symbols so that we can get a little more information?

Do the following:

cd top_of_your_open_mpi_source_tree
cd ompi/mca/btl/tcp
make CFLAGS=-g clean all install

Then run the test again (you shouldn't need to recompile your
application; this just recompiled and re-installed the TCP BTL
plugin). The output stack trace for the mca_btl_tcp stuff should now
include line numbers, and tell us exactly where it is dying. If you
get a corefile, can you load that up in gdb and send the output of
"bt full"?

{+} Jeff Squyres
{+} The Open MPI Project