diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sa.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sa.c
index 9bb5cbc0173..894bbc3d0de 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sa.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sa.c
@@ -578,7 +578,7 @@ sa_find_sizes(sa_os_t *sa, sa_bulk_attr_t *attr_desc, int attr_count,
 	for (i = 0; i != attr_count; i++) {
 		boolean_t is_var_sz;
 
-		*total += attr_desc[i].sa_length;
+		*total += P2ROUNDUP(attr_desc[i].sa_length, 8);
 		if (done)
 			goto next;
 
@@ -713,6 +713,8 @@ sa_build_layouts(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc, int attr_count,
 		length = SA_REGISTERED_LEN(sa, attrs[i]);
 		if (length == 0)
 			length = attr_desc[i].sa_length;
+		else
+			VERIFY(length == attr_desc[i].sa_length);
 
 		if (buf_space < length) {  /* switch to spill buffer */
 			VERIFY(bonustype == DMU_OT_SA);
@@ -742,6 +744,7 @@ sa_build_layouts(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc, int attr_count,
 		if (sa->sa_attr_table[attrs[i]].sa_length == 0) {
 			sahdr->sa_lengths[len_idx++] = length;
 		}
+		VERIFY((uintptr_t)data_start % 8 == 0);
 		data_start = (void *)P2ROUNDUP(((uintptr_t)data_start +
 		    length), 8);
 		buf_space -= P2ROUNDUP(length, 8);