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it looks like disabling the lazy_open flag for sharedfp components
revealead a bug that lead to a crash in file_close in some tests. Make
sure the SHAREDFP_IS_SET flag is correctly set (and not overwritten again),
and we use that to avoid a double-free of the communicator.

Signed-off-by: Edgar Gabriel <egabriel@central.uh.edu>
when a file is opened a second time for shared file pointer operations,
avoid setting the create and exclusive flag.

Signed-off-by: Edgar Gabriel <egabriel@central.uh.edu>
@edgargabriel edgargabriel merged commit 4e06b96 into open-mpi:master Jan 25, 2017
@edgargabriel edgargabriel deleted the pr/sharedfp-append-fix branch July 17, 2017 14:10
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