MDEV-25487 Assertion failed in lock_rec_move

row_ins_clust_index_entry_low(): Do not enable bulk insert if
any record locks exist on the table. Bulk insert is assumed to
be covered only by an exclusive table lock, with no row-level
locking or undo logging.

mysql-test/suite/innodb/r/insert_into_empty.result

@@ -137,3 +137,25 @@ c
 SELECT * FROM t2;
 c
 DROP TABLE t1,t2;
+#
+# MDEV-25487 Assertion failed in lock_rec_move
+#
+CREATE TABLE t1 (a INT KEY) ENGINE=InnoDB;
+SET @save_limit = @@GLOBAL.innodb_limit_optimistic_insert_debug;
+SET GLOBAL innodb_limit_optimistic_insert_debug = 2;
+BEGIN;
+SELECT * FROM t1 LOCK IN SHARE MODE;
+a
+INSERT INTO t1 VALUES (0),(1),(2);
+INSERT INTO t1 VALUES (0,1);
+ERROR 21S01: Column count doesn't match value count at row 1
+INSERT INTO t1 VALUES (2);
+ERROR 23000: Duplicate entry '2' for key 'PRIMARY'
+COMMIT;
+SET GLOBAL innodb_limit_optimistic_insert_debug = @save_limit;
+SELECT * FROM t1;
+a
+0
+1
+2
+DROP TABLE t1;

mysql-test/suite/innodb/t/insert_into_empty.test

 --source include/have_innodb.inc
 --source include/have_sequence.inc
+--source include/maybe_debug.inc
 
 # Enable MDEV-515 table-level undo logging for insert into empty table
 SET foreign_key_checks=0, unique_checks=0;
@@ -139,3 +140,30 @@ COMMIT;
 SELECT * FROM t1;
 SELECT * FROM t2;
 DROP TABLE t1,t2;
+
+--echo #
+--echo # MDEV-25487 Assertion failed in lock_rec_move
+--echo #
+
+CREATE TABLE t1 (a INT KEY) ENGINE=InnoDB;
+
+--error 0,1193
+SET @save_limit = @@GLOBAL.innodb_limit_optimistic_insert_debug;
+--error 0,1193
+SET GLOBAL innodb_limit_optimistic_insert_debug = 2;
+
+BEGIN;
+SELECT * FROM t1 LOCK IN SHARE MODE;
+INSERT INTO t1 VALUES (0),(1),(2);
+--error ER_WRONG_VALUE_COUNT_ON_ROW
+INSERT INTO t1 VALUES (0,1);
+--error ER_DUP_ENTRY
+INSERT INTO t1 VALUES (2);
+COMMIT;
+
+--error 0,ER_UNKNOWN_SYSTEM_VARIABLE
+SET GLOBAL innodb_limit_optimistic_insert_debug = @save_limit;
+
+SELECT * FROM t1;
+
+DROP TABLE t1;

storage/innobase/row/row0ins.cc

@@ -2669,6 +2669,7 @@ row_ins_clust_index_entry_low(
 	    && !trx->ddl && !trx->internal
 	    && block->page.id().page_no() == index->page
 	    && !index->table->skip_alter_undo
+	    && !index->table->n_rec_locks
 	    && !trx->is_wsrep() /* FIXME: MDEV-24623 */
 	    && !thd_is_slave(trx->mysql_thd) /* FIXME: MDEV-24622 */) {
 		DEBUG_SYNC_C("empty_root_page_insert");
@@ -2681,6 +2682,10 @@ row_ins_clust_index_entry_low(
 				goto commit_exit;
 			}
 
+			if (index->table->n_rec_locks) {
+				goto skip_bulk_insert;
+			}
+
 #ifdef BTR_CUR_HASH_ADAPT
 			if (btr_search_enabled) {
 				btr_search_x_lock_all();
@@ -2697,9 +2702,7 @@ row_ins_clust_index_entry_low(
 		trx->bulk_insert = true;
 	}
 
-#ifndef DBUG_OFF
 skip_bulk_insert:
-#endif
 	if (UNIV_UNLIKELY(entry->info_bits != 0)) {
 		ut_ad(entry->is_metadata());
 		ut_ad(flags == BTR_NO_LOCKING_FLAG);