--- old/usr/src/uts/common/fs/zfs/vdev_root.c	Mon Apr  7 00:45:28 2008
+++ new/usr/src/uts/common/fs/zfs/vdev_root.c	Mon Apr  7 00:45:28 2008
@@ -125,6 +125,7 @@
 	NULL,			/* io_start - not applicable to the root */
 	NULL,			/* io_done - not applicable to the root */
 	vdev_root_state_change,
+	NULL,
 	VDEV_TYPE_ROOT,		/* name of this vdev type */
 	B_FALSE			/* not a leaf vdev */
 };