ASAN errors or unexpected ER_TRUNCATED_WRONG_VALUE_FOR_FIELD upon adding key on virtual column

--source include/have_innodb.inc

CREATE TABLE t (a INT, b VARCHAR(8), f INT AS (a), PRIMARY KEY(b)) ENGINE=InnoDB;

INSERT INTO t (a,b) VALUES (1,'10');

ALTER TABLE t MODIFY f INT AS (b);

ALTER TABLE t ADD KEY(f);

# Cleanup

DROP TABLE t;

==4037630==ERROR: AddressSanitizer: use-after-poison on address 0x6290002a829a at pc 0x559890b7c724 bp 0x7f73fbd97f50 sp 0x7f73fbd97f48

READ of size 1 at 0x6290002a829a thread T27

    #0 0x559890b7c723 in my_mb_wc_latin1 /data/bld/10.4-asan/strings/ctype-latin1.c:372

    #1 0x559890bf6918 in my_convert_using_func /data/bld/10.4-asan/strings/ctype.c:1019

    #2 0x559890bf6f31 in my_convert /data/bld/10.4-asan/strings/ctype.c:1127

    #3 0x55988ec8f31d in copy_and_convert(char*, unsigned long, charset_info_st const*, char const*, unsigned long, charset_info_st const*, unsigned int*) /data/bld/10.4-asan/sql/sql_string.h:44

    #4 0x55988ee85195 in err_conv(char*, unsigned int, char const*, unsigned int, charset_info_st const*) /data/bld/10.4-asan/sql/sql_error.cc:909

    #5 0x55988ecb3bb1 in ErrBuff::set_str(char const*, unsigned long, charset_info_st const*) const /data/bld/10.4-asan/sql/sql_error.h:861

    #6 0x55988ecb4030 in ErrConvString::ptr() const /data/bld/10.4-asan/sql/sql_error.h:893

    #7 0x55988f6676d5 in Field_num::check_edom_and_important_data_truncation(char const*, bool, charset_info_st const*, char const*, unsigned long, char const*) /data/bld/10.4-asan/sql/field.cc:1609

    #8 0x55988f66783b in Field_num::check_edom_and_truncation(char const*, bool, charset_info_st const*, char const*, unsigned long, char const*) /data/bld/10.4-asan/sql/field.cc:1627

    #9 0x55988f6c8aa4 in Field_num::check_int(charset_info_st const*, char const*, unsigned long, char const*, int) (/mnt8t/bld/10.4-asan/sql/mysqld+0x1ab3aa4)

    #10 0x55988f667c6f in Field_num::get_int(charset_info_st const*, char const*, unsigned long, long long*, unsigned long long, long long, long long) /data/bld/10.4-asan/sql/field.cc:1692

    #11 0x55988f67bdb9 in Field_long::store(char const*, unsigned long, charset_info_st const*) /data/bld/10.4-asan/sql/field.cc:4207

    #12 0x55988f6c5c38 in Field::save_in_field_str(Field*) /data/bld/10.4-asan/sql/field.h:622

    #13 0x55988f6c8f44 in Field_str::save_in_field(Field*) /data/bld/10.4-asan/sql/field.h:1901

    #14 0x55988f6c608c in Field::store_field(Field*) /data/bld/10.4-asan/sql/field.h:786

    #15 0x55988f6e0655 in field_conv_incompatible /data/bld/10.4-asan/sql/field_conv.cc:900

    #16 0x55988f6e06f2 in field_conv(Field*, Field*) /data/bld/10.4-asan/sql/field_conv.cc:913

    #17 0x55988f77af7b in save_field_in_field /data/bld/10.4-asan/sql/item.cc:6577

    #18 0x55988f77b6c0 in Item_field::save_in_field(Field*, bool) /data/bld/10.4-asan/sql/item.cc:6628

    #19 0x55988f29a580 in TABLE::update_virtual_field(Field*, bool) /data/bld/10.4-asan/sql/table.cc:8642

    #20 0x5598900ee20b in innobase_get_computed_value(dtuple_t*, dict_v_col_t const*, dict_index_t const*, mem_block_info_t**, mem_block_info_t*, dict_field_t const*, THD*, TABLE*, unsigned char*, dict_table_t const*, upd_t const*, bool) /data/bld/10.4-asan/storage/innobase/handler/ha_innodb.cc:20882

    #21 0x5598903f1f4b in row_merge_buf_add /data/bld/10.4-asan/storage/innobase/row/row0merge.cc:579

    #22 0x5598903ff8c4 in row_merge_read_clustered_index /data/bld/10.4-asan/storage/innobase/row/row0merge.cc:2323

    #23 0x55989040eff5 in row_merge_build_indexes(trx_t*, dict_table_t*, dict_table_t*, bool, dict_index_t**, unsigned long const*, unsigned long, TABLE*, dtuple_t const*, unsigned long const*, unsigned long, ib_sequence_t&, bool, ut_stage_alter_t*, dict_add_v_col_t const*, TABLE*, bool) /data/bld/10.4-asan/storage/innobase/row/row0merge.cc:4670

    #24 0x5598901653ee in ha_innobase::inplace_alter_table(TABLE*, Alter_inplace_info*) /data/bld/10.4-asan/storage/innobase/handler/handler0alter.cc:8745

    #25 0x55988f1e5f75 in handler::ha_inplace_alter_table(TABLE*, Alter_inplace_info*) /data/bld/10.4-asan/sql/handler.h:4355

    #26 0x55988f1c6868 in mysql_inplace_alter_table /data/bld/10.4-asan/sql/sql_table.cc:8012

    #27 0x55988f1d98e5 in mysql_alter_table(THD*, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*, HA_CREATE_INFO*, TABLE_LIST*, Recreate_info*, Alter_info*, unsigned int, st_order*, bool) /data/bld/10.4-asan/sql/sql_table.cc:10582

    #28 0x55988f360ab6 in Sql_cmd_alter_table::execute(THD*) /data/bld/10.4-asan/sql/sql_alter.cc:535

    #29 0x55988ef62c2a in mysql_execute_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:6292

    #30 0x55988ef6e57e in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:8088

    #31 0x55988ef4419d in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:1857

    #32 0x55988ef40d0c in do_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:1378

    #33 0x55988f347dc6 in do_handle_one_connection(CONNECT*) /data/bld/10.4-asan/sql/sql_connect.cc:1419

    #34 0x55988f3476dd in handle_one_connection /data/bld/10.4-asan/sql/sql_connect.cc:1323

    #35 0x55988ffad53b in pfs_spawn_thread /data/bld/10.4-asan/storage/perfschema/pfs.cc:1869

    #36 0x7f7411dc9043 in start_thread nptl/pthread_create.c:442

    #37 0x7f7411e4961b in clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

0x6290002a829a is located 154 bytes inside of 16512-byte region [0x6290002a8200,0x6290002ac280)

allocated by thread T27 here:

    #0 0x7f74124b89cf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69

    #1 0x5598902a808d in mem_heap_create_block_func(mem_block_info_t*, unsigned long, char const*, unsigned int, unsigned long) /data/bld/10.4-asan/storage/innobase/mem/mem0mem.cc:277

    #2 0x55989008da68 in mem_heap_create_func /data/bld/10.4-asan/storage/innobase/include/mem0mem.inl:375

    #3 0x5598900ec906 in innobase_allocate_row_for_vcol(THD*, dict_index_t*, mem_block_info_t**, TABLE**, VCOL_STORAGE*) /data/bld/10.4-asan/storage/innobase/handler/ha_innodb.cc:20713

    #4 0x5598903f1e41 in row_merge_buf_add /data/bld/10.4-asan/storage/innobase/row/row0merge.cc:571

    #5 0x5598903ff8c4 in row_merge_read_clustered_index /data/bld/10.4-asan/storage/innobase/row/row0merge.cc:2323

    #6 0x55989040eff5 in row_merge_build_indexes(trx_t*, dict_table_t*, dict_table_t*, bool, dict_index_t**, unsigned long const*, unsigned long, TABLE*, dtuple_t const*, unsigned long const*, unsigned long, ib_sequence_t&, bool, ut_stage_alter_t*, dict_add_v_col_t const*, TABLE*, bool) /data/bld/10.4-asan/storage/innobase/row/row0merge.cc:4670

    #7 0x5598901653ee in ha_innobase::inplace_alter_table(TABLE*, Alter_inplace_info*) /data/bld/10.4-asan/storage/innobase/handler/handler0alter.cc:8745

    #8 0x55988f1e5f75 in handler::ha_inplace_alter_table(TABLE*, Alter_inplace_info*) /data/bld/10.4-asan/sql/handler.h:4355

    #9 0x55988f1c6868 in mysql_inplace_alter_table /data/bld/10.4-asan/sql/sql_table.cc:8012

    #10 0x55988f1d98e5 in mysql_alter_table(THD*, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*, HA_CREATE_INFO*, TABLE_LIST*, Recreate_info*, Alter_info*, unsigned int, st_order*, bool) /data/bld/10.4-asan/sql/sql_table.cc:10582

    #11 0x55988f360ab6 in Sql_cmd_alter_table::execute(THD*) /data/bld/10.4-asan/sql/sql_alter.cc:535

    #12 0x55988ef62c2a in mysql_execute_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:6292

    #13 0x55988ef6e57e in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:8088

    #14 0x55988ef4419d in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:1857

    #15 0x55988ef40d0c in do_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:1378

    #16 0x55988f347dc6 in do_handle_one_connection(CONNECT*) /data/bld/10.4-asan/sql/sql_connect.cc:1419

    #17 0x55988f3476dd in handle_one_connection /data/bld/10.4-asan/sql/sql_connect.cc:1323

    #18 0x55988ffad53b in pfs_spawn_thread /data/bld/10.4-asan/storage/perfschema/pfs.cc:1869

    #19 0x7f7411dc9043 in start_thread nptl/pthread_create.c:442

Thread T27 created by T0 here:

    #0 0x7f7412449726 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:207

    #1 0x55988ffad928 in spawn_thread_v1 /data/bld/10.4-asan/storage/perfschema/pfs.cc:1919

    #2 0x55988ec46f79 in inline_mysql_thread_create /data/bld/10.4-asan/include/mysql/psi/mysql_thread.h:1275

    #3 0x55988ec5e704 in create_thread_to_handle_connection(CONNECT*) /data/bld/10.4-asan/sql/mysqld.cc:6296

    #4 0x55988ec5ee4f in create_new_thread(CONNECT*) /data/bld/10.4-asan/sql/mysqld.cc:6366

    #5 0x55988ec5f31d in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /data/bld/10.4-asan/sql/mysqld.cc:6464

    #6 0x55988ec601c9 in handle_connections_sockets() /data/bld/10.4-asan/sql/mysqld.cc:6622

    #7 0x55988ec5de67 in mysqld_main(int, char**) /data/bld/10.4-asan/sql/mysqld.cc:5954

    #8 0x55988ec450a8 in main /data/bld/10.4-asan/sql/main.cc:25

    #9 0x7f7411d671c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: use-after-poison /data/bld/10.4-asan/strings/ctype-latin1.c:372 in my_mb_wc_latin1

Shadow bytes around the buggy address:

  0x0c528004d000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c528004d010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c528004d020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c528004d030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c528004d040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

=>0x0c528004d050: f7 00 00[02]f7 f7 00 00 02 f7 f7 f7 f7 f7 f7 f7

  0x0c528004d060: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c528004d070: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c528004d080: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c528004d090: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c528004d0a0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

Shadow byte legend (one shadow byte represents 8 application bytes):

  Addressable:           00

  Partially addressable: 01 02 03 04 05 06 07 

  Heap left redzone:       fa

  Freed heap region:       fd

  Stack left redzone:      f1

  Stack mid redzone:       f2

  Stack right redzone:     f3

  Stack after return:      f5

  Stack use after scope:   f8

  Global redzone:          f9

  Global init order:       f6

  Poisoned by user:        f7

  Container overflow:      fc

  Array cookie:            ac

  Intra object redzone:    bb

  ASan internal:           fe

  Left alloca redzone:     ca

  Right alloca redzone:    cb

==4037630==ABORTING

mysqltest: At line 7: query 'ALTER TABLE t ADD KEY(f)' failed: 1366: Incorrect integer value: '' for column `test`.`t`.`f` at row 1

mysqltest: At line 7: query 'ALTER TABLE t ADD KEY(f)' failed: 1366: Incorrect integer value: '��������������������������������������������������������������...' for column `test`.`t`.`f` at row 1