Index: cddl/contrib/opensolaris/cmd/ztest/ztest.c
===================================================================
--- cddl/contrib/opensolaris/cmd/ztest/ztest.c
+++ cddl/contrib/opensolaris/cmd/ztest/ztest.c
@@ -4206,7 +4206,7 @@
 		 * assign an arcbuf to a dbuf.
 		 */
 		for (j = 0; j < s; j++) {
-			if (i != 5) {
+			if (i != 5 || chunksize < (SPA_MINBLOCKSIZE * 2)) {
 				bigbuf_arcbufs[j] =
 				    dmu_request_arcbuf(bonus_db, chunksize);
 			} else {
@@ -4230,7 +4230,8 @@
 			umem_free(packbuf, packsize);
 			umem_free(bigbuf, bigsize);
 			for (j = 0; j < s; j++) {
-				if (i != 5) {
+				if (i != 5 ||
+				    chunksize < (SPA_MINBLOCKSIZE * 2)) {
 					dmu_return_arcbuf(bigbuf_arcbufs[j]);
 				} else {
 					dmu_return_arcbuf(
@@ -4274,7 +4275,7 @@
 		}
 		for (off = bigoff, j = 0; j < s; j++, off += chunksize) {
 			dmu_buf_t *dbt;
-			if (i != 5) {
+			if (i != 5 || chunksize < (SPA_MINBLOCKSIZE * 2)) {
 				bcopy((caddr_t)bigbuf + (off - bigoff),
 				    bigbuf_arcbufs[j]->b_data, chunksize);
 			} else {
@@ -4291,7 +4292,7 @@
 				VERIFY(dmu_buf_hold(os, bigobj, off,
 				    FTAG, &dbt, DMU_READ_NO_PREFETCH) == 0);
 			}
-			if (i != 5) {
+			if (i != 5 || chunksize < (SPA_MINBLOCKSIZE * 2)) {
 				dmu_assign_arcbuf(bonus_db, off,
 				    bigbuf_arcbufs[j], tx);
 			} else {