ASAN use-after-poison in Item_func_collect::add

SELECT    st_collect('');

Version: '12.2.2-MariaDB-asan-debug-log'  d640758b9478f4da9ac0023b1ac389ffc23aa9bb

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==1308714==ERROR: AddressSanitizer: use-after-poison on address 0x52d0001729c8 at pc 0x63094af2168d bp 0x74201e9f4320 sp 0x74201e9f4310

READ of size 4 at 0x52d0001729c8 thread T11

    #0 0x63094af2168c in Item_func_collect::add() /12.2/src/sql/item_sum.cc:4648

    #1 0x63094af23fab in Aggregator_simple::add() /12.2/src/sql/item_sum.h:736

    #2 0x630949e40d13 in Item_sum::aggregator_add() /12.2/src/sql/item_sum.h:569

    #3 0x630949e40b63 in Item_sum::reset_and_add() /12.2/src/sql/item_sum.h:451

    #4 0x63094a38ee8b in init_sum_functions /12.2/src/sql/sql_select.cc:30151

    #5 0x63094a371cfa in end_send_group(JOIN*, st_join_table*, bool) /12.2/src/sql/sql_select.cc:26160

    #6 0x63094a361a50 in do_select /12.2/src/sql/sql_select.cc:23998

    #7 0x63094a2d884e in JOIN::exec_inner() /12.2/src/sql/sql_select.cc:5130

    #8 0x63094a2d5d5f in JOIN::exec() /12.2/src/sql/sql_select.cc:4918

    #9 0x63094a2da3e6 in mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /12.2/src/sql/sql_select.cc:5444

    #10 0x63094a2a7039 in handle_select(THD*, LEX*, select_result*, unsigned long long) /12.2/src/sql/sql_select.cc:636

    #11 0x63094a1bf6b1 in execute_sqlcom_select /12.2/src/sql/sql_parse.cc:6210

    #12 0x63094a1aed2e in mysql_execute_command(THD*, bool) /12.2/src/sql/sql_parse.cc:3967

    #13 0x63094a1ca7c8 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /12.2/src/sql/sql_parse.cc:7932

    #14 0x63094a1a06e4 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /12.2/src/sql/sql_parse.cc:1896

    #15 0x63094a19d374 in do_command(THD*, bool) /12.2/src/sql/sql_parse.cc:1432

    #16 0x63094a6c6ecd in do_handle_one_connection(CONNECT*, bool) /12.2/src/sql/sql_connect.cc:1503

    #17 0x63094a6c6a20 in handle_one_connection /12.2/src/sql/sql_connect.cc:1415

    #18 0x63094b4a8f6b in pfs_spawn_thread /12.2/src/storage/perfschema/pfs.cc:2198

    #19 0x74203765ea41 in asan_thread_start ../../../../src/libsanitizer/asan/asan_interceptors.cpp:234

    #20 0x74203669caa3 in start_thread nptl/pthread_create.c:447

    #21 0x742036729c6b in clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

0x52d0001729c8 is located 1480 bytes inside of 32760-byte region [0x52d000172400,0x52d00017a3f8)

allocated by thread T11 here:

    #0 0x7420376fd9c7 in malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69

    #1 0x63094c2fde7c in my_malloc /12.2/src/mysys/my_malloc.c:93

    #2 0x63094c2cedae in root_alloc /12.2/src/mysys/my_alloc.c:66

    #3 0x63094c2cfdcb in reset_root_defaults /12.2/src/mysys/my_alloc.c:247

    #4 0x63094a02dbe8 in THD::init_for_queries() /12.2/src/sql/sql_class.cc:1552

    #5 0x63094a6c62c1 in prepare_new_connection_state(THD*) /12.2/src/sql/sql_connect.cc:1341

    #6 0x63094a6c6aa5 in thd_prepare_connection(THD*) /12.2/src/sql/sql_connect.cc:1436

    #7 0x63094a6c6e91 in do_handle_one_connection(CONNECT*, bool) /12.2/src/sql/sql_connect.cc:1493

    #8 0x63094a6c6a20 in handle_one_connection /12.2/src/sql/sql_connect.cc:1415

    #9 0x63094b4a8f6b in pfs_spawn_thread /12.2/src/storage/perfschema/pfs.cc:2198

    #10 0x74203765ea41 in asan_thread_start ../../../../src/libsanitizer/asan/asan_interceptors.cpp:234

    #11 0x74203669caa3 in start_thread nptl/pthread_create.c:447

Thread T11 created by T0 here:

    #0 0x7420376f51f9 in pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:245

    #1 0x63094b4a4b8f in my_thread_create /12.2/src/storage/perfschema/my_thread.h:38

    #2 0x63094b4a935e in pfs_spawn_thread_v1 /12.2/src/storage/perfschema/pfs.cc:2249

    #3 0x630949d675bb in inline_mysql_thread_create /12.2/src/include/mysql/psi/mysql_thread.h:1139

    #4 0x630949d815c4 in create_thread_to_handle_connection(CONNECT*) /12.2/src/sql/mysqld.cc:6280

    #5 0x630949d81c2f in create_new_thread(CONNECT*) /12.2/src/sql/mysqld.cc:6342

    #6 0x630949d81f5c in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /12.2/src/sql/mysqld.cc:6404

    #7 0x630949d82c6d in handle_connections_sockets() /12.2/src/sql/mysqld.cc:6516

    #8 0x630949d7f5e2 in run_main_loop /12.2/src/sql/mysqld.cc:5758

    #9 0x630949d80dfa in mysqld_main(int, char**) /12.2/src/sql/mysqld.cc:6181

    #10 0x630949d6685c in main /12.2/src/sql/main.cc:34

    #11 0x74203662a1c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

    #12 0x74203662a28a in __libc_start_main_impl ../csu/libc-start.c:360

    #13 0x630949d66774 in _start (/12.2-bld/sql/mariadbd+0x1c8d774) (BuildId: 17dcae8c926cfc9fa93d9997184236ecff620c76)

SUMMARY: AddressSanitizer: use-after-poison /12.2/src/sql/item_sum.cc:4648 in Item_func_collect::add()

Shadow bytes around the buggy address:

  0x52d000172700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x52d000172780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x52d000172800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x52d000172880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x52d000172900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

=>0x52d000172980: 00 00 00 00 00 f7 00 00 f7[01]f7 00 00 00 00 00

  0x52d000172a00: 00 00 00 00 00 00 00 00 00 00 00 f7 00 00 00 00

  0x52d000172a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x52d000172b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x52d000172b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f7 00

  0x52d000172c00: 00 f7 00 00 00 00 00 03 f7 00 00 f7 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

==1308714==ABORTING