UBSAN: null pointer passed as argument 1, which is declared to never be null in my_strnncoll_binary on SELECT ... COUNT or GROUP_CONCAT

CREATE TABLE t (c BLOB NOT NULL) ENGINE=InnoDB;

INSERT IGNORE INTO t VALUES (0);

SELECT COUNT(*) FROM t WHERE EXTRACTVALUE(c,'a')='a';

/test/10.9_opt_san/strings/ctype-bin.c:89:12: runtime error: null pointer passed as argument 1, which is declared to never be null

    #0 0x5633c2674f25 in my_strnncoll_binary /test/10.9_opt_san/strings/ctype-bin.c:89

    #1 0x5633c2674f25 in my_strnncollsp_binary /test/10.9_opt_san/strings/ctype-bin.c:128

    #2 0x5633c493f6fb in Arg_comparator::compare() /test/10.9_opt_san/sql/item_cmpfunc.h:103

    #3 0x5633c493f6fb in Item_func_eq::val_int() /test/10.9_opt_san/sql/item_cmpfunc.cc:1762

    #4 0x5633c340c414 in evaluate_join_record /test/10.9_opt_san/sql/sql_select.cc:21193

    #5 0x5633c3459933 in sub_select(JOIN*, st_join_table*, bool) /test/10.9_opt_san/sql/sql_select.cc:21095

    #6 0x5633c3605123 in do_select /test/10.9_opt_san/sql/sql_select.cc:20640

    #7 0x5633c3605123 in JOIN::exec_inner() /test/10.9_opt_san/sql/sql_select.cc:4749

    #8 0x5633c36099f9 in JOIN::exec() /test/10.9_opt_san/sql/sql_select.cc:4527

    #9 0x5633c35f7b61 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/10.9_opt_san/sql/sql_select.cc:5007

    #10 0x5633c35fba73 in handle_select(THD*, LEX*, select_result*, unsigned long) /test/10.9_opt_san/sql/sql_select.cc:543

    #11 0x5633c3212cdf in execute_sqlcom_select /test/10.9_opt_san/sql/sql_parse.cc:6268

    #12 0x5633c325288b in mysql_execute_command(THD*, bool) /test/10.9_opt_san/sql/sql_parse.cc:3959

    #13 0x5633c31e20a8 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/10.9_opt_san/sql/sql_parse.cc:8043

    #14 0x5633c3238439 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/10.9_opt_san/sql/sql_parse.cc:1910

    #15 0x5633c3243c92 in do_command(THD*, bool) /test/10.9_opt_san/sql/sql_parse.cc:1407

    #16 0x5633c3b2ed3d in do_handle_one_connection(CONNECT*, bool) /test/10.9_opt_san/sql/sql_connect.cc:1418

    #17 0x5633c3b31834 in handle_one_connection /test/10.9_opt_san/sql/sql_connect.cc:1312

    #18 0x5633c5c2f1f9 in pfs_spawn_thread /test/10.9_opt_san/storage/perfschema/pfs.cc:2201

    #19 0x14edd0d6b608 in start_thread /build/glibc-sMfBJT/glibc-2.31/nptl/pthread_create.c:477

    #20 0x14edcffe0162 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x11f162)

/test/10.9_dbg_san/strings/ctype-bin.c:89:12: runtime error: null pointer passed as argument 1, which is declared to never be null

    #0 0x55f42cc16597 in my_strnncoll_binary /test/10.9_dbg_san/strings/ctype-bin.c:89

    #1 0x55f42cc165dd in my_strnncollsp_binary /test/10.9_dbg_san/strings/ctype-bin.c:128

    #2 0x55f428a406c5 in charset_info_st::strnncollsp(char const*, unsigned long, char const*, unsigned long) const /test/10.9_dbg_san/include/m_ctype.h:864

    #3 0x55f428a406c5 in sortcmp(Binary_string const*, Binary_string const*, charset_info_st const*) /test/10.9_dbg_san/sql/sql_string.cc:853

    #4 0x55f429f237bf in Arg_comparator::compare_string() /test/10.9_dbg_san/sql/item_cmpfunc.cc:765

    #5 0x55f429f040f3 in Arg_comparator::compare() /test/10.9_dbg_san/sql/item_cmpfunc.h:103

    #6 0x55f429f040f3 in Item_func_eq::val_int() /test/10.9_dbg_san/sql/item_cmpfunc.cc:1762

    #7 0x55f4285b7d23 in evaluate_join_record /test/10.9_dbg_san/sql/sql_select.cc:21193

    #8 0x55f42865bffe in sub_select(JOIN*, st_join_table*, bool) /test/10.9_dbg_san/sql/sql_select.cc:21095

    #9 0x55f42882e362 in do_select /test/10.9_dbg_san/sql/sql_select.cc:20640

    #10 0x55f42882e362 in JOIN::exec_inner() /test/10.9_dbg_san/sql/sql_select.cc:4749

    #11 0x55f42882fc94 in JOIN::exec() /test/10.9_dbg_san/sql/sql_select.cc:4527

    #12 0x55f42881f58b 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/10.9_dbg_san/sql/sql_select.cc:5007

    #13 0x55f428820ef0 in handle_select(THD*, LEX*, select_result*, unsigned long) /test/10.9_dbg_san/sql/sql_select.cc:543

    #14 0x55f42838dfc2 in execute_sqlcom_select /test/10.9_dbg_san/sql/sql_parse.cc:6268

    #15 0x55f4283f3216 in mysql_execute_command(THD*, bool) /test/10.9_dbg_san/sql/sql_parse.cc:3959

    #16 0x55f428355728 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/10.9_dbg_san/sql/sql_parse.cc:8043

    #17 0x55f4283cb44e in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/10.9_dbg_san/sql/sql_parse.cc:1910

    #18 0x55f4283e1fa9 in do_command(THD*, bool) /test/10.9_dbg_san/sql/sql_parse.cc:1407

    #19 0x55f428eaec4b in do_handle_one_connection(CONNECT*, bool) /test/10.9_dbg_san/sql/sql_connect.cc:1418

    #20 0x55f428eb1ae5 in handle_one_connection /test/10.9_dbg_san/sql/sql_connect.cc:1312

    #21 0x55f42b40ac62 in pfs_spawn_thread /test/10.9_dbg_san/storage/perfschema/pfs.cc:2201

    #22 0x15066de74608 in start_thread /build/glibc-sMfBJT/glibc-2.31/nptl/pthread_create.c:477

    #23 0x15066d0e9162 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x11f162)

Compiled with GCC >=7.5.0 (I use GCC 9.4.0) 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