MSAN errors in find_type / find_set / Field_set::store upon LOAD DATA

CREATE DATABASE db DEFAULT CHARSET=utf16;

USE db;

CREATE TABLE t (

  a int(11) NOT NULL,

  b SET('Montana','Texas'),

  c INT NOT NULL DEFAULT 0,

  d INT

) ENGINE=MyISAM

;

INSERT INTO t (a) VALUES (1),(10);

SELECT * INTO OUTFILE 't.data' FROM t;

LOAD DATA INFILE 't.data' IGNORE INTO TABLE t;

# Cleanup

--let $datadir= `select @@datadir`

--remove_file $datadir/db/t.data

DROP DATABASE db;

==42004==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x5611b999ea29 in find_type(st_typelib const*, char const*, unsigned long, bool) /home/jenkins/10.5/sql/strfunc.cc

    #1 0x5611b999ea29 in find_set(st_typelib const*, char const*, unsigned long, charset_info_st const*, char**, unsigned int*, bool*) /home/jenkins/10.5/sql/strfunc.cc:83:23

    #2 0x5611ba0e1f59 in Field_set::store(char const*, unsigned long, charset_info_st const*) /home/jenkins/10.5/sql/field.cc:9365:18

    #3 0x5611ba0239b8 in Field::load_data_set_value(char const*, unsigned int, charset_info_st const*) /home/jenkins/10.5/sql/field.cc:1418:3

    #4 0x5611b91e8cd1 in Item_field::load_data_set_value(THD*, char const*, unsigned int, Load_data_param const*) /home/jenkins/10.5/sql/item.h:3437:12

    #5 0x5611b91e8cd1 in non-virtual thunk to Item_field::load_data_set_value(THD*, char const*, unsigned int, Load_data_param const*) /home/jenkins/10.5/sql/item.h

    #6 0x5611b94e3137 in read_sep_field(THD*, st_copy_info&, TABLE_LIST*, List<Item>&, List<Item>&, List<Item>&, READ_INFO&, String&, unsigned long, bool) /home/jenkins/10.5/sql/sql_load.cc:1127:18

    #7 0x5611b94e3137 in mysql_load(THD*, sql_exchange const*, TABLE_LIST*, List<Item>&, List<Item>&, List<Item>&, enum_duplicates, bool, bool) /home/jenkins/10.5/sql/sql_load.cc:677:14

    #8 0x5611b9535cbb in mysql_execute_command(THD*) /home/jenkins/10.5/sql/sql_parse.cc:5082:10

    #9 0x5611b9516938 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /home/jenkins/10.5/sql/sql_parse.cc:8100:18

    #10 0x5611b9509bfc in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /home/jenkins/10.5/sql/sql_parse.cc:1891:7

    #11 0x5611b95188ac in do_command(THD*) /home/jenkins/10.5/sql/sql_parse.cc:1370:17

    #12 0x5611b9b0c8d9 in do_handle_one_connection(CONNECT*, bool) /home/jenkins/10.5/sql/sql_connect.cc:1418:11

    #13 0x5611b9b0bff5 in handle_one_connection /home/jenkins/10.5/sql/sql_connect.cc:1312:5

    #14 0x5611baf0d8ea in pfs_spawn_thread /home/jenkins/10.5/storage/perfschema/pfs.cc:2201:3

    #15 0x7f56e260b608 in start_thread /build/glibc-eX1tMB/glibc-2.31/nptl/pthread_create.c:477:8

    #16 0x7f56e2310292 in clone /build/glibc-eX1tMB/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Uninitialized value was created by an allocation of 'wc' in the stack frame of function '_Z8find_setPK10st_typelibPKcmPK15charset_info_stPPcPjPb'

    #0 0x5611b999dc10 in find_set(st_typelib const*, char const*, unsigned long, charset_info_st const*, char**, unsigned int*, bool*) /home/jenkins/10.5/sql/strfunc.cc:52

SUMMARY: MemorySanitizer: use-of-uninitialized-value /home/jenkins/10.5/sql/strfunc.cc in find_type(st_typelib const*, char const*, unsigned long, bool)