rp->mp_pad = mp->mp_pad;
DPRINTF(("new right sibling: page %"Z"u", rp->mp_pgno));
+ /* Usually when splitting the root page, the cursor
+ * height is 1. But when called from mdb_update_key,
+ * the cursor height may be greater because it walks
+ * up the stack while finding the branch slot to update.
+ */
if (mc->mc_top < 1) {
if ((rc = mdb_page_new(mc, P_BRANCH, 1, &pp)))
goto done;