set local sql_mode="";
set global sql_mode="";
CREATE FUNCTION MY_KILL(tid INT) RETURNS INT
BEGIN
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION BEGIN END;
KILL tid;
RETURN (SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE ID = tid);
END|
connect con1, localhost, root;
connect con2, localhost, root;
connection con1;
connection con2;
connection con1;
SET DEBUG_SYNC= 'thread_end SIGNAL con1_end';
SET DEBUG_SYNC= 'before_do_command_net_read SIGNAL con1_read';
connection con2;
SET DEBUG_SYNC='now WAIT_FOR con1_read';
SET DEBUG_SYNC= 'now WAIT_FOR con1_end';
SET DEBUG_SYNC = 'RESET';
connection con1;
SELECT 1;
Got one of the listed errors
SELECT 1;
1
1
SELECT @id != CONNECTION_ID();
@id != CONNECTION_ID()
1
connection con2;
SELECT 4;
4
4
connection default;
KILL (SELECT COUNT(*) FROM mysql.user);
ERROR 42000: KILL does not support subqueries or stored functions
connection con1;
connection con2;
connection con1;
SET DEBUG_SYNC= 'thread_end SIGNAL con1_end';
SET DEBUG_SYNC= 'before_do_command_net_read SIGNAL con1_read WAIT_FOR kill';
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR con1_read';
SET DEBUG_SYNC= 'now WAIT_FOR con1_end';
SET DEBUG_SYNC = 'RESET';
connection con1;
SELECT 1;
Got one of the listed errors
SELECT 1;
1
1
SELECT @id != CONNECTION_ID();
@id != CONNECTION_ID()
1
connection con2;
SELECT 4;
4
4
connection default;
CREATE TABLE t1 (id INT PRIMARY KEY AUTO_INCREMENT);
CREATE TABLE t2 (id INT UNSIGNED NOT NULL);
INSERT INTO t1 VALUES
(0),(0),(0),(0),(0),(0),(0),(0), (0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0), (0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0), (0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0), (0),(0),(0),(0),(0),(0),(0),(0);
INSERT t1 SELECT 0 FROM t1 AS a1, t1 AS a2 LIMIT 4032;
INSERT INTO t2 SELECT id FROM t1;
connection con1;
connection con2;
connection con1;
SET DEBUG_SYNC= 'thread_end SIGNAL con1_end';
SET DEBUG_SYNC= 'before_acos_function SIGNAL in_sync';
SELECT id FROM t1 WHERE id IN
(SELECT DISTINCT a.id FROM t2 a, t2 b, t2 c, t2 d
GROUP BY ACOS(1/a.id), b.id, c.id, d.id
HAVING a.id BETWEEN 10 AND 20);
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL @id;
SET DEBUG_SYNC= 'now WAIT_FOR con1_end';
connection con1;
Got one of the listed errors
SELECT 1;
1
1
connection default;
SET DEBUG_SYNC = 'RESET';
DROP TABLE t1, t2;
connection con1;
connection con2;
connection con1;
SET DEBUG_SYNC= 'before_acos_function SIGNAL in_sync WAIT_FOR kill';
SELECT ACOS(0);
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL QUERY @id;
connection con1;
ACOS(0)
1.5707963267948966
SELECT 1;
1
1
SELECT @id = CONNECTION_ID();
@id = CONNECTION_ID()
1
connection default;
SET DEBUG_SYNC = 'RESET';
CREATE TABLE t1 (f1 INT);
CREATE FUNCTION bug27563() RETURNS INT(11)
DETERMINISTIC
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '70100' SET @a:= 'killed';
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET @a:= 'exception';
SET DEBUG_SYNC= 'now SIGNAL in_sync WAIT_FOR kill';
RETURN 1;
END|
connection con1;
connection con2;
connection con1;
INSERT INTO t1 VALUES (bug27563());
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL QUERY @id;
connection con1;
ERROR 70100: Query execution was interrupted
SELECT * FROM t1;
f1
connection default;
SET DEBUG_SYNC = 'RESET';
INSERT INTO t1 VALUES(0);
connection con1;
UPDATE t1 SET f1= bug27563();
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL QUERY @id;
connection con1;
ERROR 70100: Query execution was interrupted
SELECT * FROM t1;
f1
0
connection default;
SET DEBUG_SYNC = 'RESET';
INSERT INTO t1 VALUES(1);
connection con1;
DELETE FROM t1 WHERE bug27563() IS NULL;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL QUERY @id;
connection con1;
ERROR 70100: Query execution was interrupted
SELECT * FROM t1;
f1
0
1
connection default;
SET DEBUG_SYNC = 'RESET';
connection con1;
SELECT * FROM t1 WHERE f1= bug27563();
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL QUERY @id;
connection con1;
ERROR 70100: Query execution was interrupted
SELECT * FROM t1;
f1
0
1
connection default;
SET DEBUG_SYNC = 'RESET';
DROP FUNCTION bug27563;
CREATE TABLE t2 (f2 INT);
CREATE TRIGGER trg27563 BEFORE INSERT ON t1 FOR EACH ROW
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '70100' SET @a:= 'killed';
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET @a:= 'exception';
INSERT INTO t2 VALUES(0);
SET DEBUG_SYNC= 'now SIGNAL in_sync WAIT_FOR kill';
INSERT INTO t2 VALUES(1);
END|
connection con1;
INSERT INTO t1 VALUES(2),(3);
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR in_sync';
KILL QUERY @id;
connection con1;
ERROR 70100: Query execution was interrupted
SELECT * FROM t1;
f1
0
1
SELECT * FROM t2;
f2
0
connection default;
SET DEBUG_SYNC = 'RESET';
DROP TABLE t1, t2;
#
# Bug#19723: kill of active connection yields different error code
# depending on platform.
#
connection con1;
SET DEBUG_SYNC= 'thread_end SIGNAL con1_end';
KILL @id;
ERROR 70100: Connection was killed
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR con1_end';
connection con1;
# ER_SERVER_SHUTDOWN, CR_SERVER_GONE_ERROR, CR_SERVER_LOST,
# depending on the timing of close of the connection socket
SELECT 1;
Got one of the listed errors
SELECT 1;
1
1
SELECT @id != CONNECTION_ID();
@id != CONNECTION_ID()
1
connection default;
SET DEBUG_SYNC = 'RESET';
DROP FUNCTION MY_KILL;
set global sql_mode=default;
disconnect con1;
disconnect con2;
#
# MDEV-29368 Assertion `trx->mysql_thd == thd' failed in innobase_kill_query from process_timers/timer_handler and use-after-poison in innobase_kill_query
#
connect foo,localhost,root;
create table t1 (a int) engine=innodb;
insert t1 values (1);
set debug_sync='THD_cleanup_after_set_killed SIGNAL go0 WAIT_FOR go1';
set debug_sync='innobase_connection_closed SIGNAL go2 WAIT_FOR go3';
disconnect foo;
connection default;
set debug_sync='now WAIT_FOR go0';
set debug_sync='found_killee SIGNAL go1 WAIT_FOR go2';
kill $id;
select variable_value into @threads_cached from information_schema.global_status where variable_name='threads_cached';
set debug_sync='now SIGNAL go3';
drop table t1;
set debug_sync='reset';