VARCHAR(1) COMPRESSED crashes the server

CREATE TABLE t1(a VARCHAR(1) COMPRESSED);

SET column_compression_threshold=0;

INSERT INTO t1 VALUES('a');

DROP TABLE t1;

==22237==ERROR: AddressSanitizer: unknown-crash on address 0x61900009cf0c at pc 0x7f86e12b9904 bp 0x7f86d4224f90 sp 0x7f86d4224738

WRITE of size 3 at 0x61900009cf0c thread T5

    #0 0x7f86e12b9903 in __asan_memcpy (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x8c903)

    #1 0x7f86e0a01dac  (/lib/x86_64-linux-gnu/libz.so.1+0x3dac)

    #2 0x7f86e0a02906 in deflate (/lib/x86_64-linux-gnu/libz.so.1+0x4906)

    #3 0x560d73b323e3 in compress_zlib /home/svoj/devel/maria/mariadb/sql/field_comp.cc:51

    #4 0x560d73afb945 in Field_longstr::compress(char*, unsigned int*, char const*, unsigned int, charset_info_st const*) /home/svoj/devel/maria/mariadb/sql/field.cc:8027

    #5 0x560d73afc4bd in Field_varstring_compressed::store(char const*, unsigned long, charset_info_st const*) /home/svoj/devel/maria/mariadb/sql/field.cc:8092

    #6 0x560d73b8127d in Item::save_str_value_in_field(Field*, String*) /home/svoj/devel/maria/mariadb/sql/item.cc:499

    #7 0x560d73bb29ee in Item_string::save_in_field(Field*, bool) /home/svoj/devel/maria/mariadb/sql/item.cc:7006

    #8 0x560d73367d59 in fill_record(THD*, TABLE*, Field**, List<Item>&, bool, bool) /home/svoj/devel/maria/mariadb/sql/sql_base.cc:8457

    #9 0x560d733681a2 in fill_record_n_invoke_before_triggers(THD*, TABLE*, Field**, List<Item>&, bool, trg_event_type) /home/svoj/devel/maria/mariadb/sql/sql_base.cc:8510

    #10 0x560d733fff83 in mysql_insert(THD*, TABLE_LIST*, List<Item>&, List<List<Item> >&, List<Item>&, List<Item>&, enum_duplicates, bool) /home/svoj/devel/maria/mariadb/sql/sql_insert.cc:1011

    #11 0x560d7348fa95 in mysql_execute_command(THD*) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:4724

    #12 0x560d734a4c5d in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:8013

    #13 0x560d7347f997 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:1842

    #14 0x560d7347c9be in do_command(THD*) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:1387

    #15 0x560d737ca5f5 in do_handle_one_connection(CONNECT*) /home/svoj/devel/maria/mariadb/sql/sql_connect.cc:1402

    #16 0x560d737c9f5b in handle_one_connection /home/svoj/devel/maria/mariadb/sql/sql_connect.cc:1308

    #17 0x560d74058ac2 in pfs_spawn_thread /home/svoj/devel/maria/mariadb/storage/perfschema/pfs.cc:1862

    #18 0x7f86df9ba6b9 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76b9)

    #19 0x7f86dee4f41c in clone (/lib/x86_64-linux-gnu/libc.so.6+0x10741c)

0x61900009cf0c is located 140 bytes inside of 1100-byte region [0x61900009ce80,0x61900009d2cc)

allocated by thread T5 here:

    #0 0x7f86e12c5602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)

    #1 0x560d74c1e496 in sf_malloc /home/svoj/devel/maria/mariadb/mysys/safemalloc.c:118

    #2 0x560d74bee916 in my_malloc /home/svoj/devel/maria/mariadb/mysys/my_malloc.c:101

    #3 0x560d74bcf0d9 in alloc_root /home/svoj/devel/maria/mariadb/mysys/my_alloc.c:249

    #4 0x560d73717bc3 in open_table_from_share(THD*, TABLE_SHARE*, st_mysql_const_lex_string const*, unsigned int, unsigned int, unsigned int, TABLE*, bool, List<String>*) /home/svoj/devel/maria/mariadb/sql/table.cc:3211

    #5 0x560d73344f99 in open_table(THD*, TABLE_LIST*, Open_table_context*) /home/svoj/devel/maria/mariadb/sql/sql_base.cc:1924

    #6 0x560d7334bd4f in open_and_process_table /home/svoj/devel/maria/mariadb/sql/sql_base.cc:3512

    #7 0x560d7334e667 in open_tables(THD*, DDL_options_st const&, TABLE_LIST**, unsigned int*, unsigned int, Prelocking_strategy*) /home/svoj/devel/maria/mariadb/sql/sql_base.cc:4032

    #8 0x560d73352c56 in open_and_lock_tables(THD*, DDL_options_st const&, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*) /home/svoj/devel/maria/mariadb/sql/sql_base.cc:4907

    #9 0x560d732cc539 in open_and_lock_tables(THD*, TABLE_LIST*, bool, unsigned int) /home/svoj/devel/maria/mariadb/sql/sql_base.h:489

    #10 0x560d733fe766 in mysql_insert(THD*, TABLE_LIST*, List<Item>&, List<List<Item> >&, List<Item>&, List<Item>&, enum_duplicates, bool) /home/svoj/devel/maria/mariadb/sql/sql_insert.cc:766

    #11 0x560d7348fa95 in mysql_execute_command(THD*) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:4724

    #12 0x560d734a4c5d in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:8013

    #13 0x560d7347f997 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:1842

    #14 0x560d7347c9be in do_command(THD*) /home/svoj/devel/maria/mariadb/sql/sql_parse.cc:1387

    #15 0x560d737ca5f5 in do_handle_one_connection(CONNECT*) /home/svoj/devel/maria/mariadb/sql/sql_connect.cc:1402

    #16 0x560d737c9f5b in handle_one_connection /home/svoj/devel/maria/mariadb/sql/sql_connect.cc:1308

    #17 0x560d74058ac2 in pfs_spawn_thread /home/svoj/devel/maria/mariadb/storage/perfschema/pfs.cc:1862

    #18 0x7f86df9ba6b9 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76b9)

Thread T5 created by T0 here:

    #0 0x7f86e1263253 in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x36253)

    #1 0x560d74058eaf in spawn_thread_v1 /home/svoj/devel/maria/mariadb/storage/perfschema/pfs.cc:1912

    #2 0x560d732094ae in inline_mysql_thread_create /home/svoj/devel/maria/mariadb/include/mysql/psi/mysql_thread.h:1268

    #3 0x560d7321e6cf in create_thread_to_handle_connection(CONNECT*) /home/svoj/devel/maria/mariadb/sql/mysqld.cc:6534

    #4 0x560d7321edcf in create_new_thread /home/svoj/devel/maria/mariadb/sql/mysqld.cc:6604

    #5 0x560d7321fe0c in handle_connections_sockets() /home/svoj/devel/maria/mariadb/sql/mysqld.cc:6879

    #6 0x560d7321db8a in mysqld_main(int, char**) /home/svoj/devel/maria/mariadb/sql/mysqld.cc:6156

    #7 0x560d732078bf in main /home/svoj/devel/maria/mariadb/sql/main.cc:25

    #8 0x7f86ded6882f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)

SUMMARY: AddressSanitizer: unknown-crash ??:0 __asan_memcpy

Shadow bytes around the buggy address:

  0x0c328000b990: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c328000b9a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c328000b9b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c328000b9c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c328000b9d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

=>0x0c328000b9e0: 00[04]04 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c328000b9f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c328000ba00: 00 00 00 00 00 00 00 00 00 00 f7 f7 f7 f7 f7 f7

  0x0c328000ba10: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c328000ba20: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c328000ba30: 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

  Heap right redzone:      fb

  Freed heap region:       fd

  Stack left redzone:      f1

  Stack mid redzone:       f2

  Stack right redzone:     f3

  Stack partial redzone:   f4

  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

==22237==ABORTING