SIGSEGV in replace_routine_table on GRANT

SET sql_mode='';

SET log_bin_trust_function_creators=1;

RENAME TABLE mysql.procs_priv TO mysql.procs_priv_bak;

USE mysql;

CREATE TABLE procs_priv (dummy INT);

CREATE FUNCTION f() RETURNS INT RETURN (SELECT 1 t);

GRANT EXECUTE ON FUNCTION f TO a@b;

Core was generated by `/test/MD140222-mariadb-10.9.0-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x00005557948dca2c in replace_routine_table (thd=thd@entry=0x154830000db8, 

    grant_name=grant_name@entry=0x5557975e5518, table=0x15483007b148, 

    combo=..., db=<optimized out>, db@entry=0x154830014648 "mysql", 

    routine_name=routine_name@entry=0x154830013ec8 "f", sph=

    0x555795f49688 <sp_handler_function>, rights=EXECUTE_ACL, 

    revoke_grant=false) at /test/10.9_dbg/sql/sql_acl.cc:5957

5957	  table->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);

[Current thread is 1 (Thread 0x15488c1e9700 (LWP 2861119))]

(gdb) bt

#0  0x00005557948dca2c in replace_routine_table (thd=thd@entry=0x154830000db8, grant_name=grant_name@entry=0x5557975e5518, table=0x15483007b148, combo=@0x154830013f28: {<AUTHID> = {user = {str = 0x154830013f18 "a", length = 1}, host = {str = 0x154830013f20 "b", length = 1}}, auth = 0x555795ff29a0 <auth_no_password>}, db=<optimized out>, db@entry=0x154830014648 "mysql", routine_name=routine_name@entry=0x154830013ec8 "f", sph=0x555795f49688 <sp_handler_function>, rights=EXECUTE_ACL, revoke_grant=false) at /test/10.9_dbg/sql/sql_acl.cc:5957

#1  0x00005557948fc7c0 in mysql_routine_grant (thd=thd@entry=0x154830000db8, table_list=0x154830013f68, sph=0x555795f49688 <sp_handler_function>, user_list=@0x154830006060: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x154830013f50, last = 0x154830013f50, elements = 1}, <No data fields>}, rights=rights@entry=EXECUTE_ACL, revoke_grant=false, write_to_binlog=true) at /test/10.9_dbg/sql/sql_acl.cc:7327

#2  0x00005557948fcfbc in Sql_cmd_grant_sp::execute (this=0x154830014650, thd=0x154830000db8) at /test/10.9_dbg/sql/sql_acl.h:317

#3  0x00005557949ae80e in mysql_execute_command (thd=thd@entry=0x154830000db8, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /test/10.9_dbg/sql/sql_parse.cc:5988

#4  0x0000555794995315 in mysql_parse (thd=thd@entry=0x154830000db8, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x15488c1e8400) at /test/10.9_dbg/sql/sql_parse.cc:8027

#5  0x00005557949a3fb1 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x154830000db8, packet=packet@entry=0x15483000b889 "GRANT EXECUTE ON FUNCTION f TO a@b", packet_length=packet_length@entry=34, blocking=blocking@entry=true) at /test/10.9_dbg/sql/sql_class.h:1362

#6  0x00005557949a73f8 in do_command (thd=0x154830000db8, blocking=blocking@entry=true) at /test/10.9_dbg/sql/sql_parse.cc:1402

#7  0x0000555794b21fc4 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x5557975d4048, put_in_cache=put_in_cache@entry=true) at /test/10.9_dbg/sql/sql_connect.cc:1418

#8  0x0000555794b225c9 in handle_one_connection (arg=arg@entry=0x5557975d4048) at /test/10.9_dbg/sql/sql_connect.cc:1312

#9  0x0000555794fa8d67 in pfs_spawn_thread (arg=0x5557974e7268) at /test/10.9_dbg/storage/perfschema/pfs.cc:2201

#10 0x00001548b0d95609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#11 0x00001548b0983293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95