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Subject: [OMPI users] Bug: non-root processes use receive-type in ompi_coll_tuned_gather_intra_binomial
From: Michael Hofmann (michael.hofmann_at_[hidden])
Date: 2010-02-17 03:59:55

According to the MPI Standard, "only arguments sendbuf, sendcount,
sendtype, root, and comm are significant" on non-root processes in
MPI_Gather. However, in routine "ompi_coll_tuned_gather_intra_binomial"
the value of "rdtype" ("recvtype" of MPI_Gather) is used. This leads to
crash if an uninitialized value is used.

The problem exists in version 1.4.1.