>>>>> "Ralph" == Ralph Castain <r...@open-mpi.org> writes:
Ralph> I'm not sure why the group communicator would make a Ralph> difference - the code area in question knows nothing about Ralph> the mpi aspects of the job. It looks like you are hitting a Ralph> race condition that causes a particular internal recv to Ralph> not exist when we subsequently try to cancel it, which Ralph> generates that error message. How did you configure OMPI? Thank you for the reply! Must be some race problem, but I have no control of it, or do I? These are the configure options that gentoo compiles openmpi-1.4.2 with: ./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --libdir=/usr/lib64 --sysconfdir=/etc/openmpi --without-xgrid --enable-pretty-print-stacktrace --enable-orterun-prefix-by-default --without-slurm --enable-contrib-no-build=vt --enable-mpi-cxx --disable-io-romio --disable-heterogeneous --without-tm --enable-ipv6