diff --git a/module/zfs/spa.c b/module/zfs/spa.c
index 9d798ebac4..71744139e7 100644
--- a/module/zfs/spa.c
+++ b/module/zfs/spa.c
@@ -6842,6 +6842,18 @@ spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
 		dmu_tx_abort(tx);
 	for (c = 0; c < children; c++) {
 		if (vml[c] != NULL) {
+			vdev_t *tvd = vml[c]->vdev_top;
+
+			/*
+			 * Need to be sure the detachable VDEV is not
+			 * on any *other* txg's DTL list to prevent it
+			 * from being accessed after it's freed.
+			 */
+			for (int t = 0; t < TXG_SIZE; t++) {
+				(void) txg_list_remove_this(
+				    &tvd->vdev_dtl_list, vml[c], t);
+			}
+
 			vdev_split(vml[c]);
 			if (error == 0)
 				spa_history_log_internal(spa, "detach", tx,