added asserts to warn developers that ob1/csum match fragments do not support more than 2 segments

This commit was SVN r25514.

ompi/mca/pml/csum/pml_csum_recvfrag.c

@@ -147,6 +147,9 @@ void mca_pml_csum_recv_frag_callback_match(mca_btl_base_module_t* btl,
     size_t bytes_received = 0;
     uint16_t csum_received, csum=0;
     uint32_t csum_data;
+
+    /* NTH: FIXME -- we will clobber the stack if num_segments > 2 (see lines 260, 276-281) */
+    assert(num_segments < 3);
     
     if( OPAL_UNLIKELY(segments->seg_len < OMPI_PML_CSUM_MATCH_HDR_LEN) ) {
         return;

ompi/mca/pml/ob1/pml_ob1_recvfrag.c

@@ -111,6 +111,9 @@ void mca_pml_ob1_recv_frag_callback_match(mca_btl_base_module_t* btl,
     mca_pml_ob1_comm_proc_t *proc;
     size_t num_segments = des->des_dst_cnt;
     size_t bytes_received = 0;
+
+    /* NTH: FIXME -- we will clobber the stack if num_segments > 2 (see lines 199, 215-220) */
+    assert(num_segments < 3);
     
     if( OPAL_UNLIKELY(segments->seg_len < OMPI_PML_OB1_MATCH_HDR_LEN) ) {
         return;