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romio: Fix wrong communicator use in ADIOI_GEN_OpenColl #6884

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romio: Fix wrong communicator use in ADIOI_GEN_OpenColl #6884

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Commits on Jun 19, 2024

  1. romio: Fix wrong communicator use in ADIOI_GEN_OpenColl 

    When ADIOI_GEN_OpenColl is called in ADIO_CREAT mode,
file creation is done by calling ADIOI_xxx_Open with
MPI_COMM_SELF by rank == fd->hints->ranklist[0].
If successful, the file is closed with ADIOI_xxx_Close,
and later the file will be opened by all without creation flag.

The problem is that the communicator of ADIOI_GEN_OpenColl
is passed to ADIOI_xxx_Close instead of MPI_COMM_SELF.
If a collective call is made using this communicator
in ADIOI_xxx_Close, it may hang.
    @range3 @roblatham00
    range3 authored and roblatham00 committed Jun 19, 2024
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