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The redistribution routines computed buffer sizes and local memory offsets in Int. With the default 32-bit Int these overflow as soon as one process holds more than 2^31 elements, e.g. when an N x N matrix with N > 46340 is gathered onto a single process, or when the local column offset times LDA exceeds 2^31 (buff2block segfaults).
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The redistribution routines compute buffer sizes and local memory offsets in Int. With 32-bit Int these overflow once one process holds more than 2^31 elements, e.g. when an N × N matrix with N > 46340 is gathered onto a single process: memoryblocksize() goes negative (xxmr2d:out of memory), hi[h].lstart * mb->lda wraps (SIGSEGV in buff2block), and a single message above 2 GiB aborts the run without any message. Same pattern as #16 fixed in PBLAS.