source include/have_innodb.inc;
source include/have_debug.inc;
source include/have_log_bin.inc;
source include/have_binlog_format_mixed.inc;

--echo *** MDEV-25611: RESET MASTER hangs waiting for InnoDB to flush its log
# Error injection to minimize extra log flushing inside innodb.
SET @old_dbug= @@global.DEBUG_DBUG;
SET GLOBAL debug_dbug="+d,ib_log_checkpoint_avoid";
# Couple other settings that reduce redo log flushing, thus potentially
# triggering the hang.
SET @old_flush= @@GLOBAL.innodb_flush_log_at_trx_commit;
SET GLOBAL innodb_flush_log_at_trx_commit= 0;
SET @old_flush_timeout= @@GLOBAL.innoDB_flush_log_at_timeout;
SET GLOBAL innoDB_flush_log_at_timeout=2700;

--connection default
CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=InnoDB STATS_PERSISTENT=0;
INSERT INTO t1 VALUES (1,1);
INSERT INTO t1 VALUES (2,1);
INSERT INTO t1 VALUES (3,1);

connect (stop_purge,localhost,root,,);
# This blocks purge due to old data being still visible.
START TRANSACTION WITH CONSISTENT SNAPSHOT;

--connection default
INSERT INTO t1 VALUES (4,2);
DELETE FROM t1 WHERE a in (1,2,3);

# Rotate the binlog and wait for everything to settle down and latest binlog
# checkpoint to be done. The small sleep helps trigger the bug more reliably
# before the fix.
FLUSH BINARY LOGS;
--sleep 0.1

# Now unblock the purge, and wait for some purge records to be written
# to the redo log so the LSN is incremented but will not be synced to
# disk until something else happens.
--connection stop_purge
ROLLBACK;
--connection default
--disconnect stop_purge

--sleep 0.1

# Now see if RESET MASTER will request and wait for a binlog checkpoint that is never reported.
RESET MASTER;

# Clean up.
--connection default
DROP TABLE t1;
SET GLOBAL debug_dbug= @old_dbug;
SET GLOBAL innodb_flush_log_at_trx_commit= @old_flush;
SET GLOBAL innoDB_flush_log_at_timeout= @old_flush_timeout;