oshmem/shmem: Fix sshmem start address and warn if inside data region #12764
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On some platforms, the end of the data region is above our shared memory region. We end-up erroneously adding the UCX segment a second time as a static segment, causing corruption.
Possible workaround option:
-mca sshmem_base_start_address 0xbaaaab2c0000
Internal: 3995436