diff -ur pvfs-1.6.3-pre1/lib/iodcomm.c pvfs-1.6.3-pre1-fixed/lib/iodcomm.c
--- pvfs-1.6.3-pre1/lib/iodcomm.c	2004-07-16 11:04:11.000000000 -0500
+++ pvfs-1.6.3-pre1-fixed/lib/iodcomm.c	2004-07-16 11:09:02.000000000 -0500
@@ -312,8 +312,8 @@
 			errno = ENOMEM;
 			return -1;
 		}
+		memset(pfds[fd], 0, sizeof(fdesc));
 		pfds[fd]->fs = FS_RESV;
-		pfds[fd]->part_p = NULL;
 		pfds[fd]->fd.ref = -1;
 	}
 	return(iodinfo[slot].fd);
@@ -337,7 +337,25 @@
 				ERR1("fd %d was not reserved?!?\n", fd);
 				return(-1);
 			}
-			free(pfds[fd]);
+
+			/* The following two cases should never happen.  Getting here
+				indicates memory corruption or the fdesc semantics being
+				broken */
+			if (pfds[fd]->part_p != NULL)
+			{
+				ERR1("Reserved fd %d had a part_p?!?\n", fd);
+				free(pfds[fd]->part_p);
+				pfds[fd]->part_p = NULL;
+			}
+
+			if (pfds[fd]->fn_p != NULL)
+			{
+				ERR1("Reserved fd %d had a fn_p?!?\n", fd);
+				free(pfds[fd]->fn_p);
+				pfds[fd]->fn_p = NULL;
+			}
+
+  			free(pfds[fd]);
 			pfds[fd] = NULL;
 			return 0;
 		}
@@ -366,6 +384,24 @@
 				ERR1("fd %d was not reserved?!?\n", fd);
 				continue;
 			}
+
+			/* The following two cases should never happen.  Getting here
+				indicates memory corruption or the fdesc semantics being
+				broken */
+			if (pfds[fd]->part_p != NULL)
+			{
+				ERR1("Reserved fd %d had a part_p?!?\n", fd);
+				free(pfds[fd]->part_p);
+				pfds[fd]->part_p = NULL;
+			}
+
+			if (pfds[fd]->fn_p != NULL)
+			{
+				ERR1("Reserved fd %d had a fn_p?!?\n", fd);
+				free(pfds[fd]->fn_p);
+				pfds[fd]->fn_p = NULL;
+			}
+
 			free(pfds[fd]);
 			pfds[fd] = NULL;
 			iodinfo[i].fd = -1;
diff -ur pvfs-1.6.3-pre1/lib/mgrcomm.c pvfs-1.6.3-pre1-fixed/lib/mgrcomm.c
--- pvfs-1.6.3-pre1/lib/mgrcomm.c	2004-04-21 15:57:45.000000000 -0500
+++ pvfs-1.6.3-pre1-fixed/lib/mgrcomm.c	2004-07-16 11:13:08.000000000 -0500
@@ -265,8 +265,8 @@
 		ERR1("fd %d already in use?!?\n", fd);
 	}
 	pfds[fd] = (fdesc_p)malloc(sizeof(fdesc));
+	memset(pfds[fd], 0, sizeof(fdesc));
 	pfds[fd]->fs = FS_RESV;
-	pfds[fd]->part_p = NULL;
 	pfds[fd]->fd.ref = -1;
 	return(0);
 }
@@ -305,6 +305,24 @@
 		ERR1("fd %d was not reserved?!?\n", fd);
 		return(-1);
 	}
+
+	/* The following two cases should never happen.  Getting here
+		indicates memory corruption or the fdesc semantics being
+		broken */
+	if (pfds[fd]->part_p != NULL)
+		{
+			ERR1("Reserved fd %d had a part_p?!?\n", fd);
+			free(pfds[fd]->part_p);
+			pfds[fd]->part_p = NULL;
+		}
+	
+	if (pfds[fd]->fn_p != NULL)
+		{
+			ERR1("Reserved fd %d had a fn_p?!?\n", fd);
+			free(pfds[fd]->fn_p);
+			pfds[fd]->fn_p = NULL;
+		}
+	
 	free(pfds[fd]);
 	pfds[fd] = NULL;
 	return(0);