Add debug lock checks to autoinc functions. Add lock guards around an

invocation of dict_table_autoinc_initialize().

dict/dict0dict.c

@@ -441,6 +441,8 @@ dict_table_autoinc_initialize(
 	dict_table_t*	table,	/* in: table */
 	ib_longlong	value)	/* in: next value to assign to a row */
 {
+	ut_ad(mutex_own(&table->autoinc_mutex));
+
 	table->autoinc_inited = TRUE;
 	table->autoinc = value;
 }
@@ -457,6 +459,8 @@ dict_table_autoinc_read(
 {
 	ib_longlong	value;
 
+	ut_ad(mutex_own(&table->autoinc_mutex));
+
 	if (!table->autoinc_inited) {
 
 		value = 0;

row/row0mysql.c

@@ -2895,7 +2895,9 @@ row_truncate_table_for_mysql(
 
 	/* MySQL calls ha_innobase::reset_auto_increment() which does
 	the same thing. */
+	dict_table_autoinc_lock(table);
 	dict_table_autoinc_initialize(table, 0);
+	dict_table_autoinc_unlock(table);
 	dict_update_statistics(table);
 
 	trx_commit_for_mysql(trx);