LSAN: 32 bytes leaked in 1 allocation in mariadb_dyncol_json

CREATE TABLE t (c INT,INDEX (c)) TRANSACTIONAL=1;

INSERT INTO t VALUES (1);

SELECT COLUMN_JSON(c) FROM t;

SHUTDOWN;

==577810==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 32 byte(s) in 1 object(s) allocated from:

    #0 0x55a3f7e85b17 in malloc (/test/UBASAN_MD120523-mariadb-11.0.2-linux-x86_64-opt/bin/mariadbd+0x7a1eb17)

    #1 0x55a3fc28f394 in my_malloc /test/11.0_opt_san/mysys/my_malloc.c:91

    #2 0x55a3fc29d025 in init_dynamic_string /test/11.0_opt_san/mysys/string.c:39

    #3 0x55a3fc2ed493 in mariadb_dyncol_json /test/11.0_opt_san/mysys/ma_dyncol.c:4266

    #4 0x55a3fa402903 in Item_func_dyncol_json::val_str(String*) /test/11.0_opt_san/sql/item_strfunc.cc:4964

    #5 0x55a3f9528646 in Type_handler::Item_send_str(Item*, Protocol*, st_value*) const /test/11.0_opt_san/sql/sql_type.cc:7446

    #6 0x55a3f8080c4c in Protocol::send_result_set_row(List<Item>*) /test/11.0_opt_san/sql/protocol.cc:1332

    #7 0x55a3f84046da in select_send::send_data(List<Item>&) /test/11.0_opt_san/sql/sql_class.cc:3102

    #8 0x55a3f8a5f413 in select_result_sink::send_data_with_check(List<Item>&, st_select_lex_unit*, unsigned long long) /test/11.0_opt_san/sql/sql_class.h:5748

    #9 0x55a3f8a5f413 in select_result_sink::send_data_with_check(List<Item>&, st_select_lex_unit*, unsigned long long) /test/11.0_opt_san/sql/sql_class.h:5738

    #10 0x55a3f8a5f413 in end_send /test/11.0_opt_san/sql/sql_select.cc:24518

    #11 0x55a3f88fc4b9 in evaluate_join_record /test/11.0_opt_san/sql/sql_select.cc:23485

    #12 0x55a3f898f956 in sub_select(JOIN*, st_join_table*, bool) /test/11.0_opt_san/sql/sql_select.cc:23252

    #13 0x55a3f8b712e3 in do_select /test/11.0_opt_san/sql/sql_select.cc:22780

    #14 0x55a3f8b712e3 in JOIN::exec_inner() /test/11.0_opt_san/sql/sql_select.cc:4900

    #15 0x55a3f8b76743 in JOIN::exec() /test/11.0_opt_san/sql/sql_select.cc:4677

    #16 0x55a3f8b641f0 in mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /test/11.0_opt_san/sql/sql_select.cc:5158

    #17 0x55a3f8b67d80 in handle_select(THD*, LEX*, select_result*, unsigned long long) /test/11.0_opt_san/sql/sql_select.cc:616

    #18 0x55a3f86e8b80 in execute_sqlcom_select /test/11.0_opt_san/sql/sql_parse.cc:6279

    #19 0x55a3f874e5f6 in mysql_execute_command(THD*, bool) /test/11.0_opt_san/sql/sql_parse.cc:3949

    #20 0x55a3f875f4d2 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/11.0_opt_san/sql/sql_parse.cc:8014

    #21 0x55a3f876cf5d in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/11.0_opt_san/sql/sql_parse.cc:1894

    #22 0x55a3f8776728 in do_command(THD*, bool) /test/11.0_opt_san/sql/sql_parse.cc:1407

    #23 0x55a3f908580c in do_handle_one_connection(CONNECT*, bool) /test/11.0_opt_san/sql/sql_connect.cc:1416

    #24 0x55a3f9087e0c in handle_one_connection /test/11.0_opt_san/sql/sql_connect.cc:1318

    #25 0x1539dd494b42 in start_thread nptl/pthread_create.c:442

SUMMARY: AddressSanitizer: 32 byte(s) leaked in 1 allocation(s).

230515 19:40:05 [ERROR] mysqld got signal 6 ;

==1050686==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 32 byte(s) in 1 object(s) allocated from:

    #0 0x562f3ac93337 in __interceptor_malloc (/test/UBASAN_MD120523-mariadb-11.0.2-linux-x86_64-dbg/bin/mariadbd+0x7964337)

    #1 0x562f3f3aa703 in my_malloc /test/11.0_dbg_san/mysys/my_malloc.c:91

    #2 0x562f3f3b79bb in init_dynamic_string /test/11.0_dbg_san/mysys/string.c:39

    #3 0x562f3f3f548b in mariadb_dyncol_json /test/11.0_dbg_san/mysys/ma_dyncol.c:4266

    #4 0x562f3d5e7343 in Item_func_dyncol_json::val_str(String*) /test/11.0_dbg_san/sql/item_strfunc.cc:4964

    #5 0x562f3c52c7af in Type_handler::Item_send_str(Item*, Protocol*, st_value*) const /test/11.0_dbg_san/sql/sql_type.cc:7446

    #6 0x562f3bf75cf2 in Type_handler_string_result::Item_send(Item*, Protocol*, st_value*) const /test/11.0_dbg_san/sql/sql_type.h:5455

    #7 0x562f3ad07888 in Item::send(Protocol*, st_value*) /test/11.0_dbg_san/sql/item.h:1235

    #8 0x562f3aec3e96 in Protocol::send_result_set_row(List<Item>*) /test/11.0_dbg_san/sql/protocol.cc:1332

    #9 0x562f3b28f4a8 in select_send::send_data(List<Item>&) /test/11.0_dbg_san/sql/sql_class.cc:3102

    #10 0x562f3b948c34 in select_result_sink::send_data_with_check(List<Item>&, st_select_lex_unit*, unsigned long long) /test/11.0_dbg_san/sql/sql_class.h:5748

    #11 0x562f3b948c34 in end_send /test/11.0_dbg_san/sql/sql_select.cc:24518

    #12 0x562f3b7a23ef in evaluate_join_record /test/11.0_dbg_san/sql/sql_select.cc:23485

    #13 0x562f3b869299 in sub_select(JOIN*, st_join_table*, bool) /test/11.0_dbg_san/sql/sql_select.cc:23252

    #14 0x562f3ba17164 in do_select /test/11.0_dbg_san/sql/sql_select.cc:22780

    #15 0x562f3ba17164 in JOIN::exec_inner() /test/11.0_dbg_san/sql/sql_select.cc:4900

    #16 0x562f3ba18916 in JOIN::exec() /test/11.0_dbg_san/sql/sql_select.cc:4677

    #17 0x562f3ba070c1 in mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /test/11.0_dbg_san/sql/sql_select.cc:5158

    #18 0x562f3ba0b51c in handle_select(THD*, LEX*, select_result*, unsigned long long) /test/11.0_dbg_san/sql/sql_select.cc:616

    #19 0x562f3b57da01 in execute_sqlcom_select /test/11.0_dbg_san/sql/sql_parse.cc:6279

    #20 0x562f3b5deef5 in mysql_execute_command(THD*, bool) /test/11.0_dbg_san/sql/sql_parse.cc:3949

    #21 0x562f3b60e973 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/11.0_dbg_san/sql/sql_parse.cc:8014

    #22 0x562f3b61e707 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/11.0_dbg_san/sql/sql_parse.cc:1894

    #23 0x562f3b62c542 in do_command(THD*, bool) /test/11.0_dbg_san/sql/sql_parse.cc:1407

    #24 0x562f3c0018b5 in do_handle_one_connection(CONNECT*, bool) /test/11.0_dbg_san/sql/sql_connect.cc:1416

    #25 0x562f3c002dd0 in handle_one_connection /test/11.0_dbg_san/sql/sql_connect.cc:1318

    #26 0x14ae4b094b42 in start_thread nptl/pthread_create.c:442

SUMMARY: AddressSanitizer: 32 byte(s) leaked in 1 allocation(s).

230515 19:44:15 [ERROR] mysqld got signal 6 ;

Compiled with GCC >=7.5.0 (I use GCC 11.3.0) and:

    -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_UBSAN=ON -DWITH_RAPID=OFF -DWSREP_LIB_WITH_ASAN=ON

Set before execution:

    export UBSAN_OPTIONS=print_stacktrace=1

11.0.2-dbg>SELECT COLUMN_JSON(c) FROM t;

ERROR 1919 (HY000): Encountered illegal format of dynamic column string