MDEV-33341 innodb.undo_space_dblwr test case fails with Unknown Storage Engine InnoDB

Reason:
======
undo_space_dblwr test case fails if the first page of undo
tablespace is not flushed before restart the server. While
restarting the server, InnoDB fails to detect the first
page of undo tablespace from doublewrite buffer.

Fix:
===
Use "ib_log_checkpoint_avoid_hard" debug sync point
to avoid checkpoint and make sure to flush the
dirtied page before killing the server.

innodb_make_page_dirty(): Fails to set
srv_fil_make_page_dirty_debug variable.

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

@@ -4,16 +4,14 @@ Variable_name	Value
 innodb_doublewrite	ON
 create table t1(f1 int not null, f2 int not null)engine=innodb;
 insert into t1 values (1, 1);
-SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
-InnoDB		0 transactions not purged
-set GLOBAL innodb_log_checkpoint_now=1;
+SET GLOBAL innodb_fast_shutdown = 0;
+# restart: --debug_dbug=+d,ib_log_checkpoint_avoid_hard --innodb_flush_sync=0
 # Make the first page dirty for undo tablespace
 set global innodb_saved_page_number_debug = 0;
 set global innodb_fil_make_page_dirty_debug = 1;
-SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.0;
-SET GLOBAL innodb_max_dirty_pages_pct=0.0;
+SET GLOBAL innodb_buf_flush_list_now = 1;
 # Kill the server
-# restart
+# restart: --debug_dbug=+d,ib_log_checkpoint_avoid_hard --innodb_flush_sync=0
 FOUND 1 /Checksum mismatch in the first page of file/ in mysqld.1.err
 check table t1;
 Table	Op	Msg_type	Msg_text

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

@@ -9,20 +9,19 @@ show variables like 'innodb_doublewrite';
 create table t1(f1 int not null, f2 int not null)engine=innodb;
 insert into t1 values (1, 1);
 
-SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
---source include/wait_all_purged.inc
+# Slow shutdown and restart to make sure ibuf merge is finished
+SET GLOBAL innodb_fast_shutdown = 0;
+let $shutdown_timeout=;
+let $restart_parameters="--debug_dbug=+d,ib_log_checkpoint_avoid_hard --innodb_flush_sync=0";
+--source include/restart_mysqld.inc
 
-set GLOBAL innodb_log_checkpoint_now=1;
 --source ../include/no_checkpoint_start.inc
-
 --echo # Make the first page dirty for undo tablespace
 set global innodb_saved_page_number_debug = 0;
 set global innodb_fil_make_page_dirty_debug = 1;
 
-SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.0;
-SET GLOBAL innodb_max_dirty_pages_pct=0.0;
+SET GLOBAL innodb_buf_flush_list_now = 1;
 
-sleep 1;
 --let CLEANUP_IF_CHECKPOINT=drop table t1;
 --source ../include/no_checkpoint_end.inc
 

mysql-test/suite/sys_vars/r/innodb_fil_make_page_dirty_debug_basic.result

@@ -22,7 +22,4 @@ Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be
 set global innodb_saved_page_number_debug = 0;
 set global innodb_fil_make_page_dirty_debug = @space_id;
 drop table t1;
-# Must always be 0.
-SELECT @@global.innodb_fil_make_page_dirty_debug;
-@@global.innodb_fil_make_page_dirty_debug
-0
+set global innodb_fil_make_page_dirty_debug = 0;

mysql-test/suite/sys_vars/t/innodb_fil_make_page_dirty_debug_basic.test

@@ -29,6 +29,4 @@ set global innodb_saved_page_number_debug = 0;
 set global innodb_fil_make_page_dirty_debug = @space_id;
 drop table t1;
 
---echo # Must always be 0.
-SELECT @@global.innodb_fil_make_page_dirty_debug;
-
+set global innodb_fil_make_page_dirty_debug = 0;

storage/innobase/handler/ha_innodb.cc

@@ -17553,6 +17553,7 @@ innodb_make_page_dirty(THD*, st_mysql_sys_var*, void*, const void* save)
 {
 	mtr_t		mtr;
 	uint		space_id = *static_cast<const uint*>(save);
+	srv_fil_make_page_dirty_debug= space_id;
 	mysql_mutex_unlock(&LOCK_global_system_variables);
 	fil_space_t*	space = fil_space_t::get(space_id);
 
@@ -18310,13 +18311,15 @@ buf_flush_list_now_set(THD*, st_mysql_sys_var*, void*, const void* save)
     return;
   const uint s= srv_fil_make_page_dirty_debug;
   mysql_mutex_unlock(&LOCK_global_system_variables);
-  if (s)
-    buf_flush_sync();
-  else
+  if (s == 0 || srv_is_undo_tablespace(s))
   {
-    while (buf_flush_list_space(fil_system.sys_space, nullptr));
+    fil_space_t *space= fil_system.sys_space;
+    if (s) { space= fil_space_get(s); }
+    while (buf_flush_list_space(space, nullptr));
     os_aio_wait_until_no_pending_writes();
   }
+  else
+    buf_flush_sync();
   mysql_mutex_lock(&LOCK_global_system_variables);
 }