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#2322. The short version is that this patch consolidates two pieces of code that call the back-end munmap and ensures that (if dlsym is used) the corresponding dlsym is only invoked once and that the variable holding the result is volatile. This commit was SVN r22863. The following Trac tickets were found above: Ticket 2104 --> https://svn.open-mpi.org/trac/ompi/ticket/2104