ASAN errors in my_compress_buffer / Item_func_compress::val_str

--source include/have_sequence.inc

CREATE TABLE t (id INT, a VARCHAR(1024) AS (id));

INSERT INTO t (id) SELECT seq FROM seq_1_to_10000;

ALTER TABLE t ADD b VARCHAR(32);

SELECT COMPRESS(a) AS f FROM t GROUP BY f WITH ROLLUP;

# Cleanup

DROP TABLE t;

==990757==ERROR: AddressSanitizer: use-after-poison on address 0x61d0002278d0 at pc 0x7ff69f84814b bp 0x7ff69623dd40 sp 0x7ff69623d4f0

READ of size 48830 at 0x61d0002278d0 thread T5

    #0 0x7ff69f84814a in __interceptor_memcpy ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827

    #1 0x7ff69feefb81  (/lib/x86_64-linux-gnu/libz.so.1+0x4b81)

    #2 0x7ff69fef1067  (/lib/x86_64-linux-gnu/libz.so.1+0x6067)

    #3 0x7ff69fef209b in deflate (/lib/x86_64-linux-gnu/libz.so.1+0x709b)

    #4 0x5633d0bea497 in my_compress_buffer /data/bld/10.4-asan/mysys/my_compress.c:119

    #5 0x5633cfa1eb60 in Item_func_compress::val_str(String*) /data/bld/10.4-asan/sql/item_strfunc.cc:4313

    #6 0x5633cf8d20a9 in Cached_item_str::cmp() /data/bld/10.4-asan/sql/item_buff.cc:84

    #7 0x5633cf1d8eb2 in test_if_group_changed(List<Cached_item>&) /data/bld/10.4-asan/sql/sql_select.cc:25605

    #8 0x5633cf1c0ac3 in end_send_group(JOIN*, st_join_table*, bool) /data/bld/10.4-asan/sql/sql_select.cc:22248

    #9 0x5633cf1b7e10 in evaluate_join_record /data/bld/10.4-asan/sql/sql_select.cc:21160

    #10 0x5633cf1b6d65 in sub_select(JOIN*, st_join_table*, bool) /data/bld/10.4-asan/sql/sql_select.cc:20972

    #11 0x5633cf1b4550 in do_select /data/bld/10.4-asan/sql/sql_select.cc:20454

    #12 0x5633cf1433a0 in JOIN::exec_inner() /data/bld/10.4-asan/sql/sql_select.cc:4629

    #13 0x5633cf1409ab in JOIN::exec() /data/bld/10.4-asan/sql/sql_select.cc:4411

    #14 0x5633cf144a39 in mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /data/bld/10.4-asan/sql/sql_select.cc:4850

    #15 0x5633cf1150ca in handle_select(THD*, LEX*, select_result*, unsigned long) /data/bld/10.4-asan/sql/sql_select.cc:442

    #16 0x5633cf07f984 in execute_sqlcom_select /data/bld/10.4-asan/sql/sql_parse.cc:6549

    #17 0x5633cf06c90f in mysql_execute_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:3980

    #18 0x5633cf088c74 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:8088

    #19 0x5633cf05e893 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:1857

    #20 0x5633cf05b402 in do_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:1378

    #21 0x5633cf46291c in do_handle_one_connection(CONNECT*) /data/bld/10.4-asan/sql/sql_connect.cc:1419

    #22 0x5633cf462233 in handle_one_connection /data/bld/10.4-asan/sql/sql_connect.cc:1323

    #23 0x5633d00c8775 in pfs_spawn_thread /data/bld/10.4-asan/storage/perfschema/pfs.cc:1869

    #24 0x7ff69f2a8043 in start_thread nptl/pthread_create.c:442

    #25 0x7ff69f32861b in clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

0x61d000227d08 is located 0 bytes to the right of 2184-byte region [0x61d000227480,0x61d000227d08)

allocated by thread T5 here:

    #0 0x7ff69f8b89cf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69

    #1 0x5633d0c049c3 in my_malloc /data/bld/10.4-asan/mysys/my_malloc.c:101

    #2 0x5633d0be1a8e in alloc_root /data/bld/10.4-asan/mysys/my_alloc.c:246

    #3 0x5633cf38ff01 in open_table_from_share(THD*, TABLE_SHARE*, st_mysql_const_lex_string const*, unsigned int, unsigned int, unsigned int, TABLE*, bool, List<String>*) /data/bld/10.4-asan/sql/table.cc:3845

    #4 0x5633ceed62af in open_table(THD*, TABLE_LIST*, Open_table_context*) /data/bld/10.4-asan/sql/sql_base.cc:2116

    #5 0x5633ceedf987 in open_and_process_table /data/bld/10.4-asan/sql/sql_base.cc:3919

    #6 0x5633ceee2443 in open_tables(THD*, DDL_options_st const&, TABLE_LIST**, unsigned int*, unsigned int, Prelocking_strategy*) /data/bld/10.4-asan/sql/sql_base.cc:4401

    #7 0x5633ceee755e in open_and_lock_tables(THD*, DDL_options_st const&, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*) /data/bld/10.4-asan/sql/sql_base.cc:5348

    #8 0x5633cee406c1 in open_and_lock_tables(THD*, TABLE_LIST*, bool, unsigned int) /data/bld/10.4-asan/sql/sql_base.h:504

    #9 0x5633cf07ef04 in execute_sqlcom_select /data/bld/10.4-asan/sql/sql_parse.cc:6470

    #10 0x5633cf06c90f in mysql_execute_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:3980

    #11 0x5633cf088c74 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:8088

    #12 0x5633cf05e893 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/bld/10.4-asan/sql/sql_parse.cc:1857

    #13 0x5633cf05b402 in do_command(THD*) /data/bld/10.4-asan/sql/sql_parse.cc:1378

    #14 0x5633cf46291c in do_handle_one_connection(CONNECT*) /data/bld/10.4-asan/sql/sql_connect.cc:1419

    #15 0x5633cf462233 in handle_one_connection /data/bld/10.4-asan/sql/sql_connect.cc:1323

    #16 0x5633d00c8775 in pfs_spawn_thread /data/bld/10.4-asan/storage/perfschema/pfs.cc:1869

    #17 0x7ff69f2a8043 in start_thread nptl/pthread_create.c:442

Thread T5 created by T0 here:

    #0 0x7ff69f849726 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:207

    #1 0x5633d00c8b62 in spawn_thread_v1 /data/bld/10.4-asan/storage/perfschema/pfs.cc:1919

    #2 0x5633ced6121c in inline_mysql_thread_create /data/bld/10.4-asan/include/mysql/psi/mysql_thread.h:1275

    #3 0x5633ced789fb in create_thread_to_handle_connection(CONNECT*) /data/bld/10.4-asan/sql/mysqld.cc:6311

    #4 0x5633ced79146 in create_new_thread(CONNECT*) /data/bld/10.4-asan/sql/mysqld.cc:6381

    #5 0x5633ced79614 in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /data/bld/10.4-asan/sql/mysqld.cc:6479

    #6 0x5633ced7a4c0 in handle_connections_sockets() /data/bld/10.4-asan/sql/mysqld.cc:6637

    #7 0x5633ced7815e in mysqld_main(int, char**) /data/bld/10.4-asan/sql/mysqld.cc:5969

    #8 0x5633ced5f0a8 in main /data/bld/10.4-asan/sql/main.cc:25

    #9 0x7ff69f2461c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: use-after-poison ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy

Shadow bytes around the buggy address:

  0x0c3a8003cec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003ced0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

=>0x0c3a8003cf10: 00 00 00 00 00 00 00 00 00 00[f7]00 00 00 00 00

  0x0c3a8003cf20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cf30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cf40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cf50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c3a8003cf60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

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

==990757==ABORTING