Server crash in fields_in_hash_keyinfo after unsuccessful attempt to drop BLOB with long index

CREATE TABLE t1 (f INT, x BLOB, UNIQUE (x));

INSERT INTO t1 VALUES (1,'foo');

--error ER_ALTER_OPERATION_NOT_SUPPORTED,ER_ALTER_OPERATION_NOT_SUPPORTED_REASON

ALTER TABLE t1 DROP x, ALGORITHM=INPLACE;

UPDATE t1 SET x = 'bar';

# Cleanup

DROP TABLE t1;

#3  <signal handler called>

#4  0x000055d1c2109863 in fields_in_hash_keyinfo (keyinfo=0x7f71a813cc88) at /data/src/10.4/sql/table.cc:8971

#5  0x000055d1c232c00d in check_duplicate_long_entries_update (table=0x7f71a812e020, h=0x7f71a813c4e8, new_rec=0x7f71a80428b0 "\370\001") at /data/src/10.4/sql/handler.cc:6624

#6  0x000055d1c232c6e1 in handler::ha_update_row (this=0x7f71a813c4e8, old_data=0x7f71a80428c8 "\370\001", new_data=0x7f71a80428b0 "\370\001") at /data/src/10.4/sql/handler.cc:6706

#7  0x000055d1c20e061d in mysql_update (thd=0x7f71a8000b00, table_list=0x7f71a8015580, fields=..., values=..., conds=0x0, order_num=0, order=0x0, limit=18446744073709551615, handle_duplicates=DUP_ERROR, ignore=false, found_return=0x7f71bf057840, updated_return=0x7f71bf057900) at /data/src/10.4/sql/sql_update.cc:1017

#8  0x000055d1c1fdc159 in mysql_execute_command (thd=0x7f71a8000b00) at /data/src/10.4/sql/sql_parse.cc:4647

#9  0x000055d1c1fe8636 in mysql_parse (thd=0x7f71a8000b00, rawbuf=0x7f71a80154a8 "UPDATE t1 SET x = 'bar'", length=23, parser_state=0x7f71bf058180, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:8157

#10 0x000055d1c1fd3d24 in dispatch_command (command=COM_QUERY, thd=0x7f71a8000b00, packet=0x7f71a800a761 "UPDATE t1 SET x = 'bar'", packet_length=23, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1829

#11 0x000055d1c1fd24f8 in do_command (thd=0x7f71a8000b00) at /data/src/10.4/sql/sql_parse.cc:1358

#12 0x000055d1c214c003 in do_handle_one_connection (connect=0x55d1c4cffbb0) at /data/src/10.4/sql/sql_connect.cc:1399

#13 0x000055d1c214bd74 in handle_one_connection (arg=0x55d1c4cffbb0) at /data/src/10.4/sql/sql_connect.cc:1302

#14 0x000055d1c2642d17 in pfs_spawn_thread (arg=0x55d1c4df2220) at /data/src/10.4/storage/perfschema/pfs.cc:1862

#15 0x00007f71cabf4494 in start_thread (arg=0x7f71bf059700) at pthread_create.c:333

#16 0x00007f71c8fda93f in clone () from /lib/x86_64-linux-gnu/libc.so.6

==27000==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000010 (pc 0x5575459b12f0 sp 0x7f9195fb5170 bp 0x7f9195fb5190 T5)

    #0 0x5575459b12ef in fields_in_hash_keyinfo(st_key*) /data/src/10.4/sql/table.cc:8971

    #1 0x557545e835e3 in check_duplicate_long_entries_update /data/src/10.4/sql/handler.cc:6624

    #2 0x557545e848e6 in handler::ha_update_row(unsigned char const*, unsigned char const*) /data/src/10.4/sql/handler.cc:6706

    #3 0x557545947270 in mysql_update(THD*, TABLE_LIST*, List<Item>&, List<Item>&, Item*, unsigned int, st_order*, unsigned long long, enum_duplicates, bool, unsigned long long*, unsigned long long*) /data/src/10.4/sql/sql_update.cc:1017

    #4 0x5575456c8f3a in mysql_execute_command(THD*) /data/src/10.4/sql/sql_parse.cc:4647

    #5 0x5575456e0996 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.4/sql/sql_parse.cc:8157

    #6 0x5575456b8b9f in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.4/sql/sql_parse.cc:1829

    #7 0x5575456b59a0 in do_command(THD*) /data/src/10.4/sql/sql_parse.cc:1358

    #8 0x557545a490d3 in do_handle_one_connection(CONNECT*) /data/src/10.4/sql/sql_connect.cc:1399

    #9 0x557545a48acc in handle_one_connection /data/src/10.4/sql/sql_connect.cc:1302

    #10 0x557546612dae in pfs_spawn_thread /data/src/10.4/storage/perfschema/pfs.cc:1862

    #11 0x7f91a1336493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

    #12 0x7f919f71c93e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)

AddressSanitizer can not provide additional info.

SUMMARY: AddressSanitizer: SEGV /data/src/10.4/sql/table.cc:8971 fields_in_hash_keyinfo(st_key*)

Thread T5 created by T0 here:

    #0 0x7f91a156fbba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)

    #1 0x557546613376 in spawn_thread_v1 /data/src/10.4/storage/perfschema/pfs.cc:1912

    #2 0x5575454034a6 in inline_mysql_thread_create /data/src/10.4/include/mysql/psi/mysql_thread.h:1268

    #3 0x5575454185b2 in create_thread_to_handle_connection(CONNECT*) /data/src/10.4/sql/mysqld.cc:6133

    #4 0x557545418cb7 in create_new_thread(CONNECT*) /data/src/10.4/sql/mysqld.cc:6203

    #5 0x557545419047 in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /data/src/10.4/sql/mysqld.cc:6301

    #6 0x557545419c93 in handle_connections_sockets() /data/src/10.4/sql/mysqld.cc:6459

    #7 0x557545417ded in mysqld_main(int, char**) /data/src/10.4/sql/mysqld.cc:5791

    #8 0x55754540132f in main /data/src/10.4/sql/main.cc:25

    #9 0x7f919f6542b0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202b0)

==27000==ABORTING