MSAN use-of-unitialized-value errors in Query_log_event::do_apply_event

rpl.rpl_mdev10863 'innodb,mix'           w28 [ fail ]

        Test ended at 2022-08-15 04:42:51

CURRENT_TEST: rpl.rpl_mdev10863

mysqltest: At line 51: failed in 'select master_pos_wait('master-bin.000001', 64175, 300, '')': 2013: Lost connection to server during query

==120613==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x564375a3d782 in THD::reset_for_next_command(bool) /buildbot/amd64-ubuntu-2004-msan/build/sql/sql_parse.cc:7586:7

    #1 0x564375a37100 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /buildbot/amd64-ubuntu-2004-msan/build/sql/sql_parse.cc:7976:8

    #2 0x564376cc749e in Query_log_event::do_apply_event(rpl_group_info*, char const*, unsigned int) /buildbot/amd64-ubuntu-2004-msan/build/sql/log_event_server.cc:1919:9

    #3 0x5643756a07ec in Log_event::apply_event(rpl_group_info*) /buildbot/amd64-ubuntu-2004-msan/build/sql/log_event.h:1499:10

    #4 0x56437567a62d in apply_event_and_update_pos_apply(Log_event*, THD*, rpl_group_info*, int) /buildbot/amd64-ubuntu-2004-msan/build/sql/slave.cc:3881:19

    #5 0x56437626ff93 in rpt_handle_event(rpl_parallel_thread::queued_event*, rpl_parallel_thread*) /buildbot/amd64-ubuntu-2004-msan/build/sql/rpl_parallel.cc:62:8

    #6 0x5643762640f6 in handle_rpl_parallel_thread /buildbot/amd64-ubuntu-2004-msan/build/sql/rpl_parallel.cc:1378:18

    #7 0x56437749de5a in pfs_spawn_thread /buildbot/amd64-ubuntu-2004-msan/build/storage/perfschema/pfs.cc:2201:3

    #8 0x7ff914d21608 in start_thread /build/glibc-eX1tMB/glibc-2.31/nptl/pthread_create.c:477:8

    #9 0x7ff9148d7292 in clone /build/glibc-eX1tMB/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  Uninitialized value was stored to memory at

    #0 0x564376cc84ef in Query_log_event::do_apply_event(rpl_group_info*, char const*, unsigned int) /buildbot/amd64-ubuntu-2004-msan/build/sql/log_event_server.cc:1732:35

  Uninitialized value was created by a heap deallocation

    #0 0x564375520da9 in free (/buildbot/amd64-ubuntu-2004-msan/build/sql/mariadbd+0x7f5da9)

    #1 0x5643786fe710 in my_free /buildbot/amd64-ubuntu-2004-msan/build/mysys/my_malloc.c:211:3

SUMMARY: MemorySanitizer: use-of-uninitialized-value /buildbot/amd64-ubuntu-2004-msan/build/sql/sql_parse.cc:7586:7 in THD::reset_for_next_command(bool)