As reported by the mpi4py community (Bennet Fauber, Lisandro Dalcin,

Jonathan Dursi), fix a bug in the parameter verification of
MPI_ALLGATHERV: ensure to use the ''remote'' group size when checking
the recvcounts array.

This commit was SVN r26488.

ompi/mpi/c/allgatherv.c

@@ -10,6 +10,7 @@
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
  * Copyright (c) 2010      University of Houston.  All rights reserved.
+ * Copyright (c) 2012 Cisco Systems, Inc.  All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -93,7 +94,12 @@ int MPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
         }
         OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
 
-        size = ompi_comm_size(comm);
+      /* We always define the remote group to be the same as the local
+         group in the case of an intracommunicator, so it's safe to
+         get the size of the remote group here for both intra- and
+         intercommunicators */
+
+        size = ompi_comm_remote_size(comm);
         for (i = 0; i < size; ++i) {
           if (recvcounts[i] < 0) {
             return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_COUNT, FUNC_NAME);