MDEV-32452 InnoDB system tablespace is not shrunk on slow shutdown

- During slow shutdown, shrink the system tablespace which
was done in commit f9003c73 (MDEV-14795)

mysql-test/suite/innodb/r/sys_truncate_shutdown.result

+SET GLOBAL innodb_fast_shutdown=0;
+# restart
+SET GLOBAL INNODB_FILE_PER_TABLE= 0;
+Warnings:
+Warning	1287	'@@innodb_file_per_table' is deprecated and will be removed in a future release
+SET UNIQUE_CHECKS=0, FOREIGN_KEY_CHECKS=0;
+CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL,
+f3 INT NOT NULL, INDEX(f1),
+INDEX(f2), INDEX(f3))ENGINE=InnoDB;
+BEGIN;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+COMMIT;
+DROP TABLE t1;
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+NAME	FILE_SIZE
+innodb_system	70254592
+SET GLOBAL innodb_fast_shutdown=0;
+# restart
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+NAME	FILE_SIZE
+innodb_system	3145728

mysql-test/suite/innodb/r/sys_truncate_shutdown_debug.result

+call mtr.add_suppression("InnoDB: Cannot shrink the system tablespace");
+call mtr.add_suppression("InnoDB: Plugin initialization aborted");
+call mtr.add_suppression("Plugin 'InnoDB' init function returned error");
+call mtr.add_suppression("Plugin 'InnoDB' registration as a STORAGE ENGINE failed");
+SET GLOBAL innodb_fast_shutdown=0;
+# restart
+SET GLOBAL INNODB_LIMIT_OPTIMISTIC_INSERT_DEBUG=2;
+SET GLOBAL INNODB_FILE_PER_TABLE= 0;
+Warnings:
+Warning	1287	'@@innodb_file_per_table' is deprecated and will be removed in a future release
+SET UNIQUE_CHECKS=0, FOREIGN_KEY_CHECKS=0;
+CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL,
+f3 INT NOT NULL, INDEX(f1),
+INDEX(f2), INDEX(f3))ENGINE=InnoDB;
+BEGIN;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+COMMIT;
+DROP TABLE t1;
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+NAME	FILE_SIZE
+innodb_system	540016640
+SET GLOBAL INNODB_FAST_SHUTDOWN=0;
+SET GLOBAL DEBUG_DBUG="+d,shrink_buffer_pool_full";
+# restart
+FOUND 1 /\[Warning\] InnoDB: Cannot shrink the system tablespace/ in mysqld.1.err
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+NAME	FILE_SIZE
+innodb_system	540016640
+SET GLOBAL INNODB_FAST_SHUTDOWN=0;
+SET GLOBAL DEBUG_DBUG="+d,mtr_log_max_size";
+# restart
+FOUND 1 /\[ERROR\] InnoDB: Cannot shrink the system tablespace/ in mysqld.1.err
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+NAME	FILE_SIZE
+innodb_system	540016640
+SET GLOBAL INNODB_FAST_SHUTDOWN=0;
+# restart: --debug_dbug=+d,crash_after_sys_truncate
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+NAME	FILE_SIZE
+innodb_system	3145728

mysql-test/suite/innodb/t/sys_truncate_shutdown.opt

+--innodb_data_file_path=ibdata1:1M:autoextend
+--innodb_sys_tablespaces
+--innodb_page_size=4k

mysql-test/suite/innodb/t/sys_truncate_shutdown.test

+--source include/have_innodb.inc
+--source include/have_sequence.inc
+SET GLOBAL innodb_fast_shutdown=0;
+--source include/restart_mysqld.inc
+SET GLOBAL INNODB_FILE_PER_TABLE= 0;
+SET UNIQUE_CHECKS=0, FOREIGN_KEY_CHECKS=0;
+CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL,
+                f3 INT NOT NULL, INDEX(f1),
+                INDEX(f2), INDEX(f3))ENGINE=InnoDB;
+BEGIN;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+COMMIT;
+DROP TABLE t1;
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+
+SET GLOBAL innodb_fast_shutdown=0;
+--source include/restart_mysqld.inc
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;

mysql-test/suite/innodb/t/sys_truncate_shutdown_debug.opt

+--innodb_data_file_path=ibdata1:1M:autoextend
+--innodb_sys_tablespaces
+--innodb_page_size=4k

mysql-test/suite/innodb/t/sys_truncate_shutdown_debug.test

+--source include/have_innodb.inc
+--source include/have_sequence.inc
+--source include/not_embedded.inc
+--source include/have_debug.inc
+
+call mtr.add_suppression("InnoDB: Cannot shrink the system tablespace");
+call mtr.add_suppression("InnoDB: Plugin initialization aborted");
+call mtr.add_suppression("Plugin 'InnoDB' init function returned error");
+call mtr.add_suppression("Plugin 'InnoDB' registration as a STORAGE ENGINE failed");
+
+SET GLOBAL innodb_fast_shutdown=0;
+--source include/restart_mysqld.inc
+SET GLOBAL INNODB_LIMIT_OPTIMISTIC_INSERT_DEBUG=2;
+SET GLOBAL INNODB_FILE_PER_TABLE= 0;
+SET UNIQUE_CHECKS=0, FOREIGN_KEY_CHECKS=0;
+CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL,
+                f3 INT NOT NULL, INDEX(f1),
+                INDEX(f2), INDEX(f3))ENGINE=InnoDB;
+BEGIN;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
+COMMIT;
+DROP TABLE t1;
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+
+SET GLOBAL INNODB_FAST_SHUTDOWN=0;
+SET GLOBAL DEBUG_DBUG="+d,shrink_buffer_pool_full";
+--source include/restart_mysqld.inc
+
+--let SEARCH_PATTERN= \\[Warning\\] InnoDB: Cannot shrink the system tablespace
+let SEARCH_FILE= $MYSQLTEST_VARDIR/log/mysqld.1.err;
+--source include/search_pattern_in_file.inc
+
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+
+SET GLOBAL INNODB_FAST_SHUTDOWN=0;
+SET GLOBAL DEBUG_DBUG="+d,mtr_log_max_size";
+--source include/restart_mysqld.inc
+
+--let SEARCH_PATTERN= \\[ERROR\\] InnoDB: Cannot shrink the system tablespace
+let SEARCH_FILE= $MYSQLTEST_VARDIR/log/mysqld.1.err;
+--source include/search_pattern_in_file.inc
+
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;
+
+SET GLOBAL INNODB_FAST_SHUTDOWN=0;
+# Crash after shrinking the system tablespace
+let $restart_parameters=--debug_dbug="+d,crash_after_sys_truncate";
+--source include/restart_mysqld.inc
+
+SELECT NAME, FILE_SIZE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 0;

storage/innobase/handler/ha_innodb.cc

@@ -4236,6 +4236,11 @@ innobase_end(handlerton*, ha_panic_function)
 		 	}
 		}
 
+		/* Do system tablespace truncation during slow shutdown */
+		if (!srv_fast_shutdown
+		    && srv_operation == SRV_OPERATION_NORMAL) {
+			fsp_system_tablespace_truncate();
+		}
 
 		innodb_shutdown();
 		mysql_mutex_destroy(&log_requests.mutex);