Crash on DROP TABLE if the data file is corrupted

diff --git a/mysql-test/suite/innodb/t/ibuf_not_empty.test b/mysql-test/suite/innodb/t/ibuf_not_empty.test

index 8b16d197e03..a5093892b35 100644

--- a/mysql-test/suite/innodb/t/ibuf_not_empty.test

+++ b/mysql-test/suite/innodb/t/ibuf_not_empty.test

@@ -73,8 +73,32 @@ EOF

 --replace_regex /contains \d+ entries/contains #### entries/

 check table t1;

+--source include/shutdown_mysqld.inc

+

+# Truncate the file to 5 pages, as if it were empty

+perl;

+do "$ENV{MTR_SUITE_DIR}/include/crc32.pl";

+my $file = "$ENV{MYSQLD_DATADIR}/test/t1.ibd";

+open(FILE, "+<$file") || die "Unable to open $file";

+binmode FILE;

+my $ps= $ENV{PAGE_SIZE};

+my $pages=5;

+my $page;

+die "Unable to read $file" unless sysread(FILE, $page, $ps) == $ps;

+substr($page,46,4)=pack("N", $pages);

+my $polynomial = 0x82f63b78; # CRC-32C

+my $ck= pack("N",mycrc32(substr($page, 4, 22), 0, $polynomial) ^

+		 mycrc32(substr($page, 38, $ps - 38 - 8), 0, $polynomial));

+substr($page,0,4)=$ck;

+substr($page,$ps-8,4)=$ck;

+sysseek(FILE, 0, 0) || die "Unable to rewind $file\n";

+syswrite(FILE, $page, $ps)==$ps || die "Unable to write $file\n";

+truncate(FILE, $ps * $pages);

+close(FILE) || die "Unable to close $file";

+EOF

+

 --let $restart_parameters=

---source include/restart_mysqld.inc

+--source include/start_mysqld.inc

 SET GLOBAL innodb_fast_shutdown=0;

 --source include/restart_mysqld.inc

CURRENT_TEST: innodb.ibuf_not_empty

mysqltest: At line 106: query 'DROP TABLE t1' failed: 2013: Lost connection to MySQL server during query

…

Version: '10.2.30-MariaDB-debug-log'  socket: '/mariadb/10.2/build/mysql-test/var/tmp/mysqld.1.sock'  port: 16000  Source distribution

mysqld: /mariadb/10.2/storage/innobase/fsp/fsp0fsp.cc:204: ulint xdes_mtr_get_bit(const xdes_t *, ulint, ulint, mtr_t *): Assertion `(mtr)->memo_contains_page_flagged((descr), (MTR_MEMO_PAGE_SX_FIX))' failed.

…

#7  0x0000562e4329d129 in fseg_free_page_low (seg_inode=<optimized out>, space=<optimized out>, offset=17, page_size=..., ahi=<optimized out>, mtr=0x7fec0564ca38) at /mariadb/10.2/storage/innobase/fsp/fsp0fsp.cc:3098

#8  0x0000562e4329e7d2 in fseg_free_step_func (header=0x7fec05e3804a "", ahi=true, mtr=0x7fec0564ca38) at /mariadb/10.2/storage/innobase/fsp/fsp0fsp.cc:3330

#9  0x0000562e43190c7b in btr_free_but_not_root (block=0x7fec0592be90, log_mode=MTR_LOG_ALL) at /mariadb/10.2/storage/innobase/btr/btr0btr.cc:1256

#10 0x0000562e4319090c in btr_free_if_exists (page_id=..., page_size=..., index_id=21, mtr=0x7fec0564d548) at /mariadb/10.2/storage/innobase/btr/btr0btr.cc:1305

#11 0x0000562e43228408 in dict_drop_index_tree (rec=<optimized out>, pcur=<optimized out>, mtr=0x7fec0564d548) at /mariadb/10.2/storage/innobase/dict/dict0crea.cc:1019

#12 0x0000562e43112b36 in row_upd_clust_step (node=0x7febb40417a8, thr=0x7febb4043608) at /mariadb/10.2/storage/innobase/row/row0upd.cc:3125

#13 row_upd (node=0x7febb40417a8, thr=<optimized out>) at /mariadb/10.2/storage/innobase/row/row0upd.cc:3291

#14 0x0000562e431123f3 in row_upd_step (thr=0x7febb4043608) at /mariadb/10.2/storage/innobase/row/row0upd.cc:3437

#15 0x0000562e4307c256 in que_thr_step (thr=<optimized out>) at /mariadb/10.2/storage/innobase/que/que0que.cc:1022

#16 que_run_threads_low (thr=0x7febb4043608) at /mariadb/10.2/storage/innobase/que/que0que.cc:1102

#17 que_run_threads (thr=0x7febb4043608) at /mariadb/10.2/storage/innobase/que/que0que.cc:1142

#18 0x0000562e4307cd13 in que_eval_sql (info=0x7febb4047a48, sql=0x562e435eadb7 "PROCEDURE DROP_TABLE_PROC () IS\ntid CHAR;\niid CHAR;\nDECLARE CURSOR cur_idx IS\nSELECT ID FROM SYS_INDEXES\nWHERE TABLE_ID = tid FOR UPDATE;\nBEGIN\nSELECT ID INTO tid FROM SYS_TABLES\nWHERE NAME = :name FO"..., reserve_dict_mutex=0, trx=0x7fec0623c268) at /mariadb/10.2/storage/innobase/que/que0que.cc:1219

#19 0x0000562e430c65bc in row_drop_table_for_mysql (name=<optimized out>, trx=0x7fec0623c268, sqlcom=SQLCOM_DROP_TABLE, create_failed=96, nonatomic=<optimized out>) at /mariadb/10.2/storage/innobase/row/row0mysql.cc:3632

#20 0x0000562e42fb9805 in ha_innobase::delete_table (this=<optimized out>, name=0x7fec0564fff0 "./test/t1", sqlcom=SQLCOM_DROP_TABLE) at /mariadb/10.2/storage/innobase/handler/ha_innodb.cc:13392