On Apr 18, 2013, at 9:43 PM CDT, Richard Muddle <[email protected]> wrote:

In src/mpi/comm/intercomm_create.c from lines 58, the calculation of maxi seems to be incorrect when maxlpid is a multiple of 32.

/* Compute the max index and zero the pids array */ maxi = (maxlpid + 31) / 32;

if (maxi >= MAX_LPID32_ARRAY) { MPIU_CHKLMEM_MALLOC(lpidmask,int32_t*,maxi*sizeof(int32_t), mpi_errno,"lpidmask"); }

Hi Richard, Thanks for letting us know. I believe I already fixed this bug a few years ago: http://trac.mpich.org/projects/mpich/ticket/1574 http://git.mpich.org/mpich.git/commitdiff/40d88ed0 http://git.mpich.org/mpich.git/commitdiff/7159a5f9 Looks like those fixes were released in MPICH2 1.5b2: ----8<---- % git describe --contains 7159a5f9 v1.5b2~192 ----8<---- -Dave