MDEV-17470 Orphan temporary files after interrupted ALTER cause InnoDB: Operating system error number 17 and eventual fatal error 71

Orphan #sql* tables may remain after ALTER TABLE
was interrupted by timeout or KILL or client disconnect.

This is a regression caused by MDEV-16515.

Similar to temporary tables (MDEV-16647), we had better ignore the
KILL when dropping the original table in the final part of ALTER TABLE.

Closes #1020

Author: kevgs

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

@@ -68,3 +68,24 @@ SET DEBUG_SYNC = 'now SIGNAL S2';
 ERROR 23000: Duplicate entry '1' for key 'a'
 SET DEBUG_SYNC='RESET';
 DROP TABLE t1;
+#
+# MDEV-17470 Orphan temporary files after interrupted ALTER
+# cause InnoDB: Operating system error number 17 and eventual
+# fatal error 71
+#
+CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY, i INT) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (NULL,1),(NULL,2),(NULL,3),(NULL,4),(NULL,5),(NULL,6),(NULL,7),(NULL,8);
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+LOCK TABLE t1 READ;
+SET max_statement_time= 1;
+ALTER TABLE t1 FORCE, ALGORITHM=COPY;
+ERROR 70100: Query execution was interrupted (max_statement_time exceeded)
+SET DEBUG_SYNC = 'now SIGNAL stop_waining';
+SET DEBUG_SYNC = 'now WAIT_FOR stop_waining';
+UNLOCK TABLES;
+DROP TABLE t1;
+SET DEBUG_SYNC = 'RESET';

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

@@ -100,3 +100,31 @@ DROP TABLE t1;
 
 # Wait till all disconnects are completed
 --source include/wait_until_count_sessions.inc
+
+--echo #
+--echo # MDEV-17470 Orphan temporary files after interrupted ALTER
+--echo # cause InnoDB: Operating system error number 17 and eventual
+--echo # fatal error 71
+--echo #
+CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY, i INT) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (NULL,1),(NULL,2),(NULL,3),(NULL,4),(NULL,5),(NULL,6),(NULL,7),(NULL,8);
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+INSERT INTO t1 SELECT NULL, i FROM t1;
+
+LOCK TABLE t1 READ;
+
+--connect (con1,localhost,root,,test)
+SET max_statement_time= 1;
+--error ER_STATEMENT_TIMEOUT
+ALTER TABLE t1 FORCE, ALGORITHM=COPY;
+SET DEBUG_SYNC = 'now SIGNAL stop_waining';
+--disconnect con1
+
+--connection default
+SET DEBUG_SYNC = 'now WAIT_FOR stop_waining';
+UNLOCK TABLES;
+DROP TABLE t1;
+SET DEBUG_SYNC = 'RESET';

storage/innobase/row/row0mysql.cc

@@ -4224,9 +4224,10 @@ row_drop_table_for_mysql(
 		calling btr_search_drop_page_hash_index() while we
 		hold the InnoDB dictionary lock, we will drop any
 		adaptive hash index entries upfront. */
+		const bool is_temp = dict_table_is_temporary(table)
+			|| strstr(tablename_minus_db, tmp_file_prefix);
 		while (buf_LRU_drop_page_hash_for_tablespace(table)) {
-			if ((!dict_table_is_temporary(table)
-			     && trx_is_interrupted(trx))
+			if ((!is_temp && trx_is_interrupted(trx))
 			    || srv_shutdown_state != SRV_SHUTDOWN_NONE) {
 				err = DB_INTERRUPTED;
 				goto funct_exit;

storage/xtradb/row/row0mysql.cc

@@ -4234,9 +4234,10 @@ row_drop_table_for_mysql(
 		calling btr_search_drop_page_hash_index() while we
 		hold the InnoDB dictionary lock, we will drop any
 		adaptive hash index entries upfront. */
+		const bool is_temp = dict_table_is_temporary(table)
+			|| strstr(tablename_minus_db, tmp_file_prefix);
 		while (buf_LRU_drop_page_hash_for_tablespace(table)) {
-			if ((!dict_table_is_temporary(table)
-			     && trx_is_interrupted(trx))
+			if ((!is_temp && trx_is_interrupted(trx))
 			    || srv_shutdown_state != SRV_SHUTDOWN_NONE) {
 				err = DB_INTERRUPTED;
 				goto funct_exit;