Test innodb.buf_pool_resize_pcur_restore is flaky

                      innodb.buf_pool_resize_pcur_restore      w55 [ fail ]

        Test ended at 2026-10-23 02:24:19

CURRENT_TEST: innodb.buf_pool_resize_pcur_restore

mysqltest: At line 156: query 'call read_into_first_new_block('t2')' failed: ER_SIGNAL_EXCEPTION (1644): Wrong placement

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

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

@@ -90,6 +90,7 @@ begin

       select pk into @n from t3 where pk= p;

       set p= p + 1;

     end while;

+    do sleep(1.5);

     execute read_tbl;

     select block_id into blk from information_schema.innodb_buffer_page

     where table_name = concat('`test`.`', tbl, '`');

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

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

@@ -101,6 +101,15 @@ delimiter ;|

 # Purge resets DB_TRX_ID in the inserted records. Let it finish, so that it

 # reads no pages into the free blocks that the procedure counts.

 set global innodb_max_purge_lag_wait= 0;

+# Stop purge. While history exists, the purge coordinator runs once per

+# second. It reads undo log pages and the header page of each rollback

+# segment, and these reads can take the free blocks that the procedure

+# counts. A read view does not stop these reads. FLUSH TABLES ... FOR

+# EXPORT stops the purge coordinator.

+create table t5 (a int) engine=innodb;

+connect (stop_purge,localhost,root);

+flush tables t5 for export;

+connection default;

 set @old_size= @@global.innodb_buffer_pool_size;

 set @new_size= 12582912;

@@ -133,9 +142,6 @@ connection con1;

 --reap

 connection default;

 set global innodb_buffer_pool_size= @old_size;

-# Purge was blocked by the read view of the paused read. Let it finish, so

-# that it reads no pages into the new blocks of the next case.

-set global innodb_max_purge_lag_wait= 0;

 --echo #

 --echo # An UPDATE that continues from a stale position

@@ -165,9 +171,13 @@ connection default;

 select group_concat(pk) from t2 where val = 'b';

 set debug_sync= 'reset';

+connection stop_purge;

+unlock tables;

+disconnect stop_purge;

+connection default;

 drop procedure read_into_first_new_block;

 drop function hold;

-drop table t1, t2, t3, t4;

+drop table t1, t2, t3, t4, t5;

 set global innodb_buffer_pool_size= @old_size;

 set global innodb_lru_scan_depth= @save_scan_depth;

 --source include/wait_until_count_sessions.inc