ASAN heap-use-after-free in Explain_query::~Explain_query

CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;

EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";

# Cleanup

DROP TABLE t;

==2019086==ERROR: AddressSanitizer: heap-use-after-free on address 0x62b000034838 at pc 0x55df0bfc85dc bp 0x7fe9d0fe33f0 sp 0x7fe9d0fe33e8

READ of size 1 at 0x62b000034838 thread T5

    #0 0x55df0bfc85db in Explain_query::~Explain_query() /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_explain.cc:62

    #1 0x55df0bfd6570 in delete_explain_query(LEX*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_explain.cc:2432

    #2 0x55df0bb911a4 in log_slow_statement(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:2560

    #3 0x55df0bb9035d in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:2427

    #4 0x55df0bb8986b in do_command(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:1398

    #5 0x55df0bf4d159 in do_handle_one_connection(CONNECT*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_connect.cc:1403

    #6 0x55df0bf4ca55 in handle_one_connection /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_connect.cc:1308

    #7 0x55df0d4fa1ae in pfs_spawn_thread /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/storage/perfschema/pfs.cc:1869

    #8 0x7fe9dbd7aea6 in start_thread nptl/pthread_create.c:477

    #9 0x7fe9dbc9aaee in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xfcaee)

0x62b000034838 is located 13880 bytes inside of 24608-byte region [0x62b000031200,0x62b000037220)

freed by thread T5 here:

    #0 0x7fe9dc680b6f in __interceptor_free ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:123

    #1 0x55df0d60f036 in my_free /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/mysys/my_malloc.c:223

    #2 0x55df0d5ec411 in free_root /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/mysys/my_alloc.c:430

    #3 0x55df0bbfe4f1 in Prepared_statement::~Prepared_statement() /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_prepare.cc:4057

    #4 0x55df0bbfe5f3 in Prepared_statement::~Prepared_statement() /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_prepare.cc:4059

    #5 0x55df0bbf8335 in mysql_sql_stmt_execute_immediate(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_prepare.cc:2995

    #6 0x55df0bb99e56 in mysql_execute_command(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:3877

    #7 0x55df0bbb5665 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:7855

    #8 0x55df0bb8ccb3 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:1852

    #9 0x55df0bb8986b in do_command(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:1398

    #10 0x55df0bf4d159 in do_handle_one_connection(CONNECT*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_connect.cc:1403

    #11 0x55df0bf4ca55 in handle_one_connection /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_connect.cc:1308

    #12 0x55df0d4fa1ae in pfs_spawn_thread /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/storage/perfschema/pfs.cc:1869

    #13 0x7fe9dbd7aea6 in start_thread nptl/pthread_create.c:477

previously allocated by thread T5 here:

    #0 0x7fe9dc680e8f in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145

    #1 0x55df0d60e4ca in my_malloc /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/mysys/my_malloc.c:101

    #2 0x55df0d5ea249 in init_alloc_root /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/mysys/my_alloc.c:82

    #3 0x55df0beb80e0 in init_sql_alloc(st_mem_root*, char const*, unsigned int, unsigned int, unsigned long) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/thr_malloc.cc:65

    #4 0x55df0bbfdb53 in Prepared_statement::Prepared_statement(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_prepare.cc:3976

    #5 0x55df0bbf80c8 in mysql_sql_stmt_execute_immediate(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_prepare.cc:2963

    #6 0x55df0bb99e56 in mysql_execute_command(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:3877

    #7 0x55df0bbb5665 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:7855

    #8 0x55df0bb8ccb3 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:1852

    #9 0x55df0bb8986b in do_command(THD*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_parse.cc:1398

    #10 0x55df0bf4d159 in do_handle_one_connection(CONNECT*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_connect.cc:1403

    #11 0x55df0bf4ca55 in handle_one_connection /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_connect.cc:1308

    #12 0x55df0d4fa1ae in pfs_spawn_thread /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/storage/perfschema/pfs.cc:1869

    #13 0x7fe9dbd7aea6 in start_thread nptl/pthread_create.c:477

Thread T5 created by T0 here:

    #0 0x7fe9dc62c2a2 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:214

    #1 0x55df0d4fa59b in spawn_thread_v1 /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/storage/perfschema/pfs.cc:1919

    #2 0x55df0b8c1d86 in inline_mysql_thread_create /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/include/mysql/psi/mysql_thread.h:1275

    #3 0x55df0b8d9f63 in create_thread_to_handle_connection(CONNECT*) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/mysqld.cc:6677

    #4 0x55df0b8da6c3 in create_new_thread /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/mysqld.cc:6747

    #5 0x55df0b8db82d in handle_connections_sockets() /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/mysqld.cc:7005

    #6 0x55df0b8d92e3 in mysqld_main(int, char**) /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/mysqld.cc:6299

    #7 0x55df0b8c0614 in main /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/main.cc:25

    #8 0x7fe9dbbc1d09 in __libc_start_main ../csu/libc-start.c:308

SUMMARY: AddressSanitizer: heap-use-after-free /home/jenkins/workspace/sandbox-elenst/Nightly-Build-CS/src/sql/sql_explain.cc:62 in Explain_query::~Explain_query()

Shadow bytes around the buggy address:

  0x0c567fffe8b0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe8c0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe8d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe8e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe8f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

=>0x0c567fffe900: fd fd fd fd fd fd fd[fd]fd fd fd fd fd fd fd fd

  0x0c567fffe910: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe920: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe930: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe940: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c567fffe950: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

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

  Shadow gap:              cc

==2019086==ABORTING

commit bd9274faa469cc164099c7497c18a0e0a9b1184b

Author: Dmitry Shulga

Date:   Mon Oct 17 15:05:17 2022 +0700

    MDEV-16128: Server crash in Item_func::print_op on 2nd execution of PS

    For some queries that involve tables with different but convertible