Bug#1120695: openmpi-bin: Unable to find reachable pairing between local and remote interfaces

[José Luis García Pallero]

The definition of

export OMPI_MCA_btl_tcp_if_include=lo

makes dissapear the warning. What does it mean?

El vie, 14 nov 2025 a las 22:18, Santiago Vila (<sanvila at debian.org>) escribió:
>
> On Fri, Nov 14, 2025 at 09:50:29PM +0100, J.L.G. Pallero wrote:
> > Package: openmpi-bin
> > Version: 5.0.9-1
> > Severity: important
> > X-Debbugs-Cc: jgpallero at gmail.com
> >
> > Dear Maintainer,
> >
> > Trying to execute a MPI program with mpirun that works a few days ago, it still works, but I obtain some strange messages I can't interpret. The messages are:
> >
> > [geo-w540][[64946,1],2][../../../../../../opal/mca/btl/tcp/btl_tcp_proc.c:266:mca_btl_tcp_proc_create_interface_graph] [geo-w540][[64946,1],1][../../../../../../opal/mca/btl/tcp/btl_tcp_proc.c:266:mca_btl_tcp_proc_create_interface_graph] Unable to find reachable pairing between local and remote interfaces
>
> Hello. I had a similar problem some time ago, which I forwarded here:
>
> https://github.com/hypre-space/hypre/issues/1194
>
> Can you try this to see if the messages (which afaik are just warnings
> and harmless) go away?
>
> export OMPI_MCA_btl_tcp_if_include=lo
>
> Thanks.



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José Luis García Pallero
jgpallero at gmail.com
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