MDEV-25503 InnoDB hangs on startup during recovery

InnoDB startup hangs if a DDL transaction needs to be
rolled back and a recovered transaction on statistics
tables exists. In that case, InnoDB should rollback
the transaction which holds locks on innodb_table_stats
or innodb_index_stats during trx_rollback_or_clean_recovered().

mysql-test/suite/innodb/r/innodb-alter-tempfile.result

@@ -50,3 +50,18 @@ Warnings:
 Warning	1082	InnoDB: Table test/t1 contains 1 indexes inside InnoDB, which is different from the number of indexes 2 defined in the MariaDB 
 Warning	1082	InnoDB: Table test/t1 contains 1 indexes inside InnoDB, which is different from the number of indexes 2 defined in the MariaDB 
 DROP TABLE t1;
+#
+# MDEV-25503 InnoDB hangs on startup during recovery
+#
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB STATS_PERSISTENT=1;
+connect  con1,localhost,root,,;
+BEGIN;
+DELETE FROM mysql.innodb_table_stats;
+connect  con2,localhost,root,,;
+SET DEBUG_SYNC='inplace_after_index_build SIGNAL blocked WAIT_FOR ever';
+ALTER TABLE t1 FORCE;
+connection default;
+SET DEBUG_SYNC='now WAIT_FOR blocked';
+SELECT * FROM t1;
+a
+DROP TABLE t1;

mysql-test/suite/innodb/t/innodb-alter-tempfile.test

@@ -12,6 +12,8 @@
 
 --source include/innodb_page_size.inc
 
+--source include/have_debug_sync.inc
+
 call mtr.add_suppression("Cannot find index f2 in InnoDB index dictionary.");
 call mtr.add_suppression("InnoDB indexes are inconsistent with what defined in .frm for table .*");
 call mtr.add_suppression("Table test/t1 contains 1 indexes inside InnoDB, which is different from the number of indexes 2 defined in the MariaDB  .*");
@@ -69,3 +71,23 @@ disconnect con1;
 SHOW KEYS FROM t1;
 DROP TABLE t1;
 remove_files_wildcard $datadir/test #sql-*.frm;
+
+--echo #
+--echo # MDEV-25503 InnoDB hangs on startup during recovery
+--echo #
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB STATS_PERSISTENT=1;
+connect (con1,localhost,root,,);
+BEGIN;
+DELETE FROM mysql.innodb_table_stats;
+
+connect (con2,localhost,root,,);
+SET DEBUG_SYNC='inplace_after_index_build SIGNAL blocked WAIT_FOR ever';
+send ALTER TABLE t1 FORCE;
+
+connection default;
+SET DEBUG_SYNC='now WAIT_FOR blocked';
+--let $shutdown_timeout=0
+--source include/restart_mysqld.inc
+SELECT * FROM t1;
+DROP TABLE t1;
+remove_files_wildcard $datadir/test #sql-*.frm;

storage/innobase/dict/dict0dict.cc

@@ -6719,3 +6719,9 @@ dict_table_t::get_overflow_field_local_len() const
 	/* new-format table: do not store any BLOB prefix locally */
 	return BTR_EXTERN_FIELD_REF_SIZE;
 }
+
+bool dict_table_t::is_stats_table() const
+{
+  return !strcmp(name.m_name, TABLE_STATS_NAME) ||
+         !strcmp(name.m_name, INDEX_STATS_NAME);
+}

storage/innobase/include/dict0mem.h

@@ -1935,6 +1935,11 @@ struct dict_table_t {
         return true;
     return false;
   }
+
+  /** Check whether the table name is same as mysql/innodb_stats_table
+  or mysql/innodb_index_stats.
+  @return true if the table name is same as stats table */
+  bool is_stats_table() const;
 };
 
 inline bool table_name_t::is_temporary() const

storage/innobase/include/trx0trx.h

@@ -1191,6 +1191,10 @@ struct trx_t {
     ut_ad(old_n_ref > 0);
   }
 
+  /** @return whether the table has lock on
+  mysql.innodb_table_stats and mysql.innodb_index_stats */
+  bool has_stats_table_lock() const;
+
   /** Free the memory to trx_pools */
   inline void free();
 

storage/innobase/trx/trx0roll.cc

@@ -677,7 +677,8 @@ ibool
 trx_rollback_resurrected(
 /*=====================*/
 	trx_t*	trx,	/*!< in: transaction to rollback or clean */
-	ibool*	all)	/*!< in/out: FALSE=roll back dictionary transactions;
+	ibool*	all)	/*!< in/out: FALSE=roll back dictionary and
+			statistics table transactions;
 			TRUE=roll back all non-PREPARED transactions */
 {
 	ut_ad(trx_sys_mutex_own());
@@ -713,7 +714,8 @@ trx_rollback_resurrected(
 		}
 		trx_mutex_exit(trx);
 
-		if (*all || trx_get_dict_operation(trx) != TRX_DICT_OP_NONE) {
+		if (*all || trx_get_dict_operation(trx) != TRX_DICT_OP_NONE
+		    || trx->has_stats_table_lock()) {
 			trx_sys_mutex_exit();
 			trx_rollback_active(trx);
 			if (trx->error_state != DB_SUCCESS) {

storage/innobase/trx/trx0trx.cc

@@ -3072,3 +3072,16 @@ trx_set_rw_mode(
 
 	mutex_exit(&trx_sys->mutex);
 }
+
+bool trx_t::has_stats_table_lock() const
+{
+  for (lock_list::const_iterator it= lock.table_locks.begin(),
+       end= lock.table_locks.end(); it != end; ++it)
+  {
+     const lock_t *lock= *it;
+     if (lock && lock->un_member.tab_lock.table->is_stats_table())
+       return true;
+  }
+
+  return false;
+}