SET DEBUG_SYNC= 'RESET';
#
# Bug#42438: Crash ha_partition::change_table_ptr
# Test when remove partitioning is done while drop table is waiting
# for the table.
# After MDL was introduced, there is no longer any race, so test is done
# by adding a small sleep to verify that the delete waits. This happens
# only until ALTER tries to upgrade its MDL lock, which ends up in MDL
# deadlock which is correctly reported.
connect con1, localhost, root,,;
SET DEBUG_SYNC= 'RESET';
CREATE TABLE t1
(a INTEGER,
b INTEGER NOT NULL,
KEY (b))
ENGINE = MYISAM
/*!50100  PARTITION BY RANGE (a)
(PARTITION p0 VALUES LESS THAN (2),
PARTITION p1 VALUES LESS THAN (20),
PARTITION p2 VALUES LESS THAN (100),
PARTITION p3 VALUES LESS THAN MAXVALUE ) */;
SET DEBUG_SYNC= 'alter_table_before_create_table_no_lock SIGNAL removing_partitioning WAIT_FOR waiting_for_alter';
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL waiting_for_upgrade';
ALTER TABLE t1 REMOVE PARTITIONING;
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR removing_partitioning';
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL waiting_for_alter';
SET DEBUG_SYNC= 'rm_table_no_locks_before_delete_table WAIT_FOR waiting_for_upgrade';
DROP TABLE IF EXISTS t1;
connection con1;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
connection default;
SET DEBUG_SYNC= 'RESET';
connection con1;
SET DEBUG_SYNC= 'RESET';
#
# Bug#42438: Crash ha_partition::change_table_ptr
# Test when remove partitioning is failing due to drop table is already
# in progress.
# After MDL was introduced, there is no longer any race, so test is done
# by adding a small sleep to verify that the alter waits.
CREATE TABLE t2
(a INTEGER,
b INTEGER NOT NULL,
KEY (b))
ENGINE = MYISAM
PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (2),
PARTITION p1 VALUES LESS THAN (20),
PARTITION p2 VALUES LESS THAN (100),
PARTITION p3 VALUES LESS THAN MAXVALUE);
SET DEBUG_SYNC= 'alter_table_before_open_tables SIGNAL removing_partitions WAIT_FOR waiting_for_alter';
SET DEBUG_SYNC= 'alter_table_before_rename_result_table WAIT_FOR delete_done';
ALTER TABLE t2 REMOVE PARTITIONING;
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR removing_partitions';
SET DEBUG_SYNC= 'rm_table_no_locks_before_delete_table SIGNAL waiting_for_alter WAIT_FOR mtr_continue';
SET DEBUG_SYNC= 'rm_table_no_locks_before_binlog SIGNAL delete_done';
DROP TABLE IF EXISTS t2;
# Create a new connection thread to orchestrate the ALTER and DROP
# threads' DEBUG_SYNC points to avoid lost signals
connect con2,localhost,root,,;
SET DEBUG_SYNC= 'now SIGNAL mtr_continue';
connection default;
connection con1;
ERROR 42S02: Table 'test.t2' doesn't exist
SET DEBUG_SYNC= 'RESET';
disconnect con1;
connection default;
SET DEBUG_SYNC= 'RESET';
End of 5.1 tests