[mpich-discuss] Destination value is being overwritten during MPI_Isend

[coolhead.pranay at gmail.com]

Hi,

I encountered a strange problem when trying to send a message using
MPI_ISend. The program exits with the following error message

*Fatal error in MPI_Isend: Invalid rank, error stack:
MPI_Isend(146): MPI_Isend(buf=0x6bbfc0, count=129, MPI_DOUBLE, dest=99,
tag=99, MPI_COMM_WORLD, request=0x6bd000) failed
MPI_Isend(96).: Invalid rank has value 99 but must be nonnegative and less
than 4
rank 1 in job 129  kratos_43452   caused collective abort of all ranks
  exit status of rank 1: return code 1 *

I am pretty sure that the value of destination is < nprocs. Another strange
error is that when I change the tag to 88 the error is almost the same
except dest=88, "Invalid rank has a value 88".

Can tell me possible reasons for this strange behavior ?
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