Unexpected ER_NOT_KEYFILE or MSAN errors in heap_check_heap

--source include/have_sequence.inc

SET max_heap_table_size= 1024*1024*1024;

CREATE TABLE t1 (a INT, b BLOB) ENGINE=MEMORY;

--connect (con1,localhost,root,,)

SET max_heap_table_size= 1024*1024*1024;

--send INSERT INTO t1 SELECT seq, REPEAT('x',100) FROM seq_1_to_2000000

--connection default

let $wait_condition=

  SELECT COUNT(*) FROM information_schema.PROCESSLIST

   WHERE COMMAND = 'Query' AND INFO LIKE 'INSERT INTO t1 SELECT%'

     AND STATE = 'Sending data';

--source include/wait_condition.inc

SET lock_wait_timeout=1;

let $i= 10;

while ($i)

{

  --error 0,ER_LOCK_WAIT_TIMEOUT

  INSERT INTO t1 VALUES (1, REPEAT('y',100));

  dec $i;

}

--connection con1

--error 0,ER_RECORD_FILE_FULL,ER_NOT_KEYFILE,126

--reap

--disconnect con1

--connection default

--error 0,ER_NOT_KEYFILE,126

CHECK TABLE t1;

DROP TABLE t1;

==3070126==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x557b16626947 in heap_check_heap /data/bld/testing/bb-blob-main-monty-msan/storage/heap/_check.c:121:9

    #1 0x557b1660e191 in ha_heap::external_lock(THD*, int) /data/bld/testing/bb-blob-main-monty-msan/storage/heap/ha_heap.cc:539:36

    #2 0x557b15aebaf3 in handler::ha_external_lock(THD*, int) /data/bld/testing/bb-blob-main-monty-msan/sql/handler.cc:8030:3

    #3 0x557b15f8268e in handler::ha_external_unlock(THD*) /data/bld/testing/bb-blob-main-monty-msan/sql/handler.h:3772:45

    #4 0x557b15f8268e in unlock_external(THD*, TABLE**, unsigned int) /data/bld/testing/bb-blob-main-monty-msan/sql/lock.cc:791:11

    #5 0x557b15f8268e in mysql_lock_tables(THD*, st_mysql_lock*, unsigned int) /data/bld/testing/bb-blob-main-monty-msan/sql/lock.cc:404:12

    #6 0x557b15f80e59 in mysql_lock_tables(THD*, TABLE**, unsigned int, unsigned int) /data/bld/testing/bb-blob-main-monty-msan/sql/lock.cc:351:7

    #7 0x557b14f2e760 in lock_tables(THD*, TABLE_LIST*, unsigned int, unsigned int) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_base.cc:6080:23

    #8 0x557b14f303b8 in open_and_lock_tables(THD*, DDL_options_st const&, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_base.cc:5802:7

    #9 0x557b14ff90d6 in open_and_lock_tables(THD*, TABLE_LIST*, bool, unsigned int) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_base.h:545:10

    #10 0x557b14ff90d6 in mysql_insert(THD*, TABLE_LIST*, List<Item>&, List<List<Item>>&, List<Item>&, List<Item>&, enum_duplicates, bool, select_result*) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_insert.cc:812:9

    #11 0x557b1510c480 in mysql_execute_command(THD*, bool) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_parse.cc:4502:10

    #12 0x557b150f1089 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_parse.cc:7945:18

    #13 0x557b150ea314 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_parse.cc:1903:7

    #14 0x557b150f20ec in do_command(THD*, bool) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_parse.cc:1437:17

    #15 0x557b155aeccc in do_handle_one_connection(CONNECT*, bool) /data/bld/testing/bb-blob-main-monty-msan/sql/sql_connect.cc:1503:11

    #16 0x557b155ae7a6 in handle_one_connection /data/bld/testing/bb-blob-main-monty-msan/sql/sql_connect.cc:1415:5

    #17 0x557b16420e17 in pfs_spawn_thread /data/bld/testing/bb-blob-main-monty-msan/storage/perfschema/pfs.cc:2198:3

    #18 0x7f47835a71f4 in start_thread nptl/pthread_create.c:442:8

    #19 0x7f47836278eb in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

  Memory was marked as uninitialized

    #0 0x557b14c7930d in __msan_allocated_memory (/share8t/bld/testing/bb-blob-main-monty-msan/sql/mariadbd+0x99c30d) (BuildId: 278fd5847d1b9376af8666aa771ee93ef4db7ba7)

    #1 0x557b170424c4 in my_malloc /data/bld/testing/bb-blob-main-monty-msan/mysys/my_malloc.c:117:7

SUMMARY: MemorySanitizer: use-of-uninitialized-value /data/bld/testing/bb-blob-main-monty-msan/storage/heap/_check.c:121:9 in heap_check_heap

mysqltest: At line 27: query 'INSERT INTO t1 VALUES (1, REPEAT('y',100))' failed with wrong errno ER_NOT_KEYFILE (1034): 'Index for table 't1' is corrupt; try to repair it', instead of  (0)...