In case of error dump some more informations just to make it more clear.

This commit was SVN r3045.

src/mca/ptl/tcp/src/ptl_tcp_sendfrag.c

@@ -165,6 +165,10 @@ bool mca_ptl_tcp_send_frag_handler(mca_ptl_tcp_send_frag_t* frag, int sd)
             case EWOULDBLOCK:
                 /* ompi_output(0, "mca_ptl_tcp_send_frag_handler: EWOULDBLOCK\n"); */
                 return false;
+	    case EFAULT:
+                ompi_output( 0, "mca_ptl_tcp_send_frag_handler: writev error (%p, %d)\n\t%s(%d)\n",
+                             frag->frag_vec_ptr[0].iov_base, frag->frag_vec_ptr[0].iov_len,
+                             strerror(errno), frag->frag_vec_cnt );
             default:
                 {
                 ompi_output(0, "mca_ptl_tcp_send_frag_handler: writev failed with errno=%d", errno);