Assertion `page_is_leaf(block->frame)' failed in lock_rec_validate_page

mysqld: /data/src/bb-10.4-MDEV-17520/storage/innobase/lock/lock0lock.cc:5083: ulint lock_rec_validate_page(const buf_block_t*): Assertion `page_is_leaf(block->frame)' failed.

181204 14:21:55 [ERROR] mysqld got signal 6 ;

#7  0x00007f96c8d7dee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x0000558f0add41fd in lock_rec_validate_page (block=0x7f96a3a4ee68) at /data/src/bb-10.4-MDEV-17520/storage/innobase/lock/lock0lock.cc:5083

#9  0x0000558f0add492e in lock_rec_block_validate (space_id=9, page_no=3) at /data/src/bb-10.4-MDEV-17520/storage/innobase/lock/lock0lock.cc:5215

#10 0x0000558f0add4cfb in lock_validate () at /data/src/bb-10.4-MDEV-17520/storage/innobase/lock/lock0lock.cc:5289

#11 0x0000558f0add2c88 in lock_print_info_all_transactions (file=0x558f0c9786c0) at /data/src/bb-10.4-MDEV-17520/storage/innobase/lock/lock0lock.cc:4786

#12 0x0000558f0af07241 in srv_printf_innodb_monitor (file=0x558f0c9786c0, nowait=0, trx_start_pos=0x7f96c818dbe0, trx_end=0x7f96c818dbe8) at /data/src/bb-10.4-MDEV-17520/storage/innobase/srv/srv0srv.cc:1258

#13 0x0000558f0ad4e249 in innodb_show_status (hton=0x558f0c9319c0, thd=0x7f965c000b00, stat_print=0x558f0aa1d369 <stat_print(THD*, char const*, size_t, char const*, size_t, char const*, size_t)>) at /data/src/bb-10.4-MDEV-17520/storage/innobase/handler/ha_innodb.cc:15669

#14 0x0000558f0ad4ecb6 in innobase_show_status (hton=0x558f0c9319c0, thd=0x7f965c000b00, stat_print=0x558f0aa1d369 <stat_print(THD*, char const*, size_t, char const*, size_t, char const*, size_t)>, stat_type=HA_ENGINE_STATUS) at /data/src/bb-10.4-MDEV-17520/storage/innobase/handler/ha_innodb.cc:16087

#15 0x0000558f0aa1d703 in ha_show_status (thd=0x7f965c000b00, db_type=0x558f0c9319c0, stat=HA_ENGINE_STATUS) at /data/src/bb-10.4-MDEV-17520/sql/handler.cc:5897

#16 0x0000558f0a705068 in mysql_execute_command (thd=0x7f965c000b00) at /data/src/bb-10.4-MDEV-17520/sql/sql_parse.cc:4013

#17 0x0000558f0a711dee in mysql_parse (thd=0x7f965c000b00, rawbuf=0x7f965c015b58 "SHOW ENGINE INNODB STATUS /* QNO 85 CON_ID 12 */", length=48, parser_state=0x7f96c818e650, is_com_multi=false, is_next_command=false) at /data/src/bb-10.4-MDEV-17520/sql/sql_parse.cc:8092

#18 0x0000558f0a6ff0dc in dispatch_command (command=COM_QUERY, thd=0x7f965c000b00, packet=0x7f965c421311 "", packet_length=49, is_com_multi=false, is_next_command=false) at /data/src/bb-10.4-MDEV-17520/sql/sql_parse.cc:1851

#19 0x0000558f0a6fdb00 in do_command (thd=0x7f965c000b00) at /data/src/bb-10.4-MDEV-17520/sql/sql_parse.cc:1396

#20 0x0000558f0a8691ce in do_handle_one_connection (connect=0x558f0d44c530) at /data/src/bb-10.4-MDEV-17520/sql/sql_connect.cc:1402

#21 0x0000558f0a868f52 in handle_one_connection (arg=0x558f0d44c530) at /data/src/bb-10.4-MDEV-17520/sql/sql_connect.cc:1308

#22 0x00007f96ca839494 in start_thread (arg=0x7f96c818f700) at pthread_create.c:333

#23 0x00007f96c8e3a93f in clone () from /lib/x86_64-linux-gnu/libc.so.6

thread2_init:

  CREATE TABLE `t1` (

    `t1` TEXT,

    `v1` VARCHAR(1),

    `t2` TEXT,

    `v2` VARCHAR(1),

    UNIQUE (`v2`),

    UNIQUE (`t2`(255))

  ) ENGINE=InnoDB ROW_FORMAT=DYNAMIC

  ; CREATE TABLE `t2` LIKE `t1`

  ; CREATE TABLE `t3` LIKE `t1`

  ; CREATE TABLE `t4` LIKE `t1`

  ; INSERT IGNORE INTO `t1` VALUES vals,vals,vals,vals,vals,vals,vals,vals,vals,vals 

  ; INSERT IGNORE INTO `t2` VALUES vals,vals,vals,vals,vals,vals,vals,vals,vals,vals 

  ; INSERT IGNORE INTO `t3` VALUES vals,vals,vals,vals,vals,vals,vals,vals,vals,vals 

  ; INSERT IGNORE INTO `t4` VALUES vals,vals,vals,vals,vals,vals,vals,vals,vals,vals 

  ; SELECT * FROM `t1` INTO OUTFILE 'load.data.t1'

  ; SELECT * FROM `t2` INTO OUTFILE 'load.data.t2'

  ; SELECT * FROM `t3` INTO OUTFILE 'load.data.t3'

  ; SELECT * FROM `t4` INTO OUTFILE 'load.data.t4'

;

vals:

  (_char(1024),_char(1),_char(1024),_char(1));

thread1:

  SHOW ENGINE INNODB STATUS;

query:

  DELETE FROM my_table LIMIT _digit |

  LOAD DATA INFILE { "'load.data.t".$prng->int(1,4)."'" } REPLACE INTO TABLE my_table

;

my_table:

  t1 | t2 | t3 | t4 ;

perl ./runall-new.pl  --basedir=/data/bld/10.2 --vardir=/dev/shm/vardir --duration=300 --threads=2 --grammar=mdev14409.yy --skip-gendata