MDEV-21910 Deadlock between BF abort and manual KILL commandbb-10.5-MDEV-21910

When high priority replication slave applier encounters lock conflict in innodb,
it will force the conflicting lock holder transaction (victim) to rollback.
This is a must in multi-master sychronous replication model to avoid cluster lock-up.
This high priority victim abort (aka "brute force" (BF) abort), is started
from innodb lock manager while holding the victim's transaction's (trx) mutex.
Depending on the execution state of the victim transaction, it may happen that the
BF abort will call for THD::awake() to wake up the victim transaction for the rollback.
Now, if BF abort requires THD::awake() to be called, then the applier thread executed
locking protocol of: victim trx mutex -> victim THD::LOCK_thd_data

If, at the same time another DBMS super user issues KILL command to abort the same victim,
it will execute locking protocol of: victim THD::LOCK_thd_data  -> victim trx mutex.
These two locking protocol acquire mutexes in opposite order, hence unresolvable mutex locking
deadlock may occur.

The fix in this commit adds THD::wsrep_aborter flag to synchronize who can kill the victim
This flag is set both when BF is called for from innodb and by KILL command.
Either path of victim killing will bail out if victim's wsrep_killed is already
set to avoid mutex conflicts with the other aborter execution. THD::wsrep_aborter
records the aborter THD's ID. This is needed to preserve the right to kill
the victim from different locations for the same aborter thread.
It is also good error logging, to see who is reponsible for the abort.

A new test case was added in galera.galera_bf_kill_debug.test for scenario where
wsrep applier thread and manual KILL command try to kill same idle victim

1 files changed, 152 insertions, 143 deletions

diff --git a/mysql-test/suite/perfschema/r/nesting.result b/mysql-test/suite/perfschema/r/nesting.result
index e3137d634a6..ba655d3c329 100644
--- a/mysql-test/suite/perfschema/r/nesting.result
+++ b/mysql-test/suite/perfschema/r/nesting.result
@@ -114,152 +114,161 @@ and (end_event_id <= @marker_end)
 ) all_events
 order by relative_event_id asc;
 relative_event_id	relative_end_event_id	event_name	comment	nesting_event_type	relative_nesting_event_id
-0	20	statement/sql/select	select "MARKER_BEGIN" as marker	NULL	NULL
-1	4	stage/sql/starting	(stage)	STATEMENT	0
+0	21	statement/sql/select	select "MARKER_BEGIN" as marker	NULL	NULL
+1	5	stage/sql/starting	(stage)	STATEMENT	0
 2	2	wait/io/socket/sql/client_connection	recv	STAGE	1
 3	3	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	1
-4	4	wait/io/file/sql/query_log	write	STAGE	1
-5	5	stage/sql/checking permissions	(stage)	STATEMENT	0
-6	6	stage/sql/Opening tables	(stage)	STATEMENT	0
-7	7	stage/sql/After opening tables	(stage)	STATEMENT	0
-8	8	stage/sql/init	(stage)	STATEMENT	0
-9	9	stage/sql/Optimizing	(stage)	STATEMENT	0
-10	10	stage/sql/Executing	(stage)	STATEMENT	0
-11	11	stage/sql/End of update loop	(stage)	STATEMENT	0
-12	12	stage/sql/Query end	(stage)	STATEMENT	0
-13	13	stage/sql/Commit	(stage)	STATEMENT	0
-14	14	stage/sql/closing tables	(stage)	STATEMENT	0
-15	15	stage/sql/Starting cleanup	(stage)	STATEMENT	0
-16	16	stage/sql/Freeing items	(stage)	STATEMENT	0
-17	17	wait/io/socket/sql/client_connection	send	STATEMENT	0
-18	18	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	0
-19	20	stage/sql/Reset for next command	(stage)	STATEMENT	0
-20	20	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	19
-21	21	idle	idle	NULL	NULL
-22	42	statement/sql/select	select "This is simple statement one" as payload	NULL	NULL
-23	26	stage/sql/starting	(stage)	STATEMENT	22
-24	24	wait/io/socket/sql/client_connection	recv	STAGE	23
-25	25	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	23
-26	26	wait/io/file/sql/query_log	write	STAGE	23
-27	27	stage/sql/checking permissions	(stage)	STATEMENT	22
-28	28	stage/sql/Opening tables	(stage)	STATEMENT	22
-29	29	stage/sql/After opening tables	(stage)	STATEMENT	22
-30	30	stage/sql/init	(stage)	STATEMENT	22
-31	31	stage/sql/Optimizing	(stage)	STATEMENT	22
-32	32	stage/sql/Executing	(stage)	STATEMENT	22
-33	33	stage/sql/End of update loop	(stage)	STATEMENT	22
-34	34	stage/sql/Query end	(stage)	STATEMENT	22
-35	35	stage/sql/Commit	(stage)	STATEMENT	22
-36	36	stage/sql/closing tables	(stage)	STATEMENT	22
-37	37	stage/sql/Starting cleanup	(stage)	STATEMENT	22
-38	38	stage/sql/Freeing items	(stage)	STATEMENT	22
-39	39	wait/io/socket/sql/client_connection	send	STATEMENT	22
-40	40	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	22
-41	42	stage/sql/Reset for next command	(stage)	STATEMENT	22
-42	42	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	41
-43	43	idle	idle	NULL	NULL
-44	64	statement/sql/select	select "This is simple statement two" as payload	NULL	NULL
-45	48	stage/sql/starting	(stage)	STATEMENT	44
-46	46	wait/io/socket/sql/client_connection	recv	STAGE	45
-47	47	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	45
-48	48	wait/io/file/sql/query_log	write	STAGE	45
-49	49	stage/sql/checking permissions	(stage)	STATEMENT	44
-50	50	stage/sql/Opening tables	(stage)	STATEMENT	44
-51	51	stage/sql/After opening tables	(stage)	STATEMENT	44
-52	52	stage/sql/init	(stage)	STATEMENT	44
-53	53	stage/sql/Optimizing	(stage)	STATEMENT	44
-54	54	stage/sql/Executing	(stage)	STATEMENT	44
-55	55	stage/sql/End of update loop	(stage)	STATEMENT	44
-56	56	stage/sql/Query end	(stage)	STATEMENT	44
-57	57	stage/sql/Commit	(stage)	STATEMENT	44
-58	58	stage/sql/closing tables	(stage)	STATEMENT	44
-59	59	stage/sql/Starting cleanup	(stage)	STATEMENT	44
-60	60	stage/sql/Freeing items	(stage)	STATEMENT	44
-61	61	wait/io/socket/sql/client_connection	send	STATEMENT	44
-62	62	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	44
-63	64	stage/sql/Reset for next command	(stage)	STATEMENT	44
-64	64	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	63
-65	65	idle	idle	NULL	NULL
-66	85	statement/sql/select	select "This is the first part of a multi query" as payload;
+4	4	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	1
+5	5	wait/io/file/sql/query_log	write	STAGE	1
+6	6	stage/sql/checking permissions	(stage)	STATEMENT	0
+7	7	stage/sql/Opening tables	(stage)	STATEMENT	0
+8	8	stage/sql/After opening tables	(stage)	STATEMENT	0
+9	9	stage/sql/init	(stage)	STATEMENT	0
+10	10	stage/sql/Optimizing	(stage)	STATEMENT	0
+11	11	stage/sql/Executing	(stage)	STATEMENT	0
+12	12	stage/sql/End of update loop	(stage)	STATEMENT	0
+13	13	stage/sql/Query end	(stage)	STATEMENT	0
+14	14	stage/sql/Commit	(stage)	STATEMENT	0
+15	15	stage/sql/closing tables	(stage)	STATEMENT	0
+16	16	stage/sql/Starting cleanup	(stage)	STATEMENT	0
+17	17	stage/sql/Freeing items	(stage)	STATEMENT	0
+18	18	wait/io/socket/sql/client_connection	send	STATEMENT	0
+19	19	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	0
+20	21	stage/sql/Reset for next command	(stage)	STATEMENT	0
+21	21	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	20
+22	22	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STATEMENT	0
+23	23	idle	idle	NULL	NULL
+24	45	statement/sql/select	select "This is simple statement one" as payload	NULL	NULL
+25	29	stage/sql/starting	(stage)	STATEMENT	24
+26	26	wait/io/socket/sql/client_connection	recv	STAGE	25
+27	27	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	25
+28	28	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	25
+29	29	wait/io/file/sql/query_log	write	STAGE	25
+30	30	stage/sql/checking permissions	(stage)	STATEMENT	24
+31	31	stage/sql/Opening tables	(stage)	STATEMENT	24
+32	32	stage/sql/After opening tables	(stage)	STATEMENT	24
+33	33	stage/sql/init	(stage)	STATEMENT	24
+34	34	stage/sql/Optimizing	(stage)	STATEMENT	24
+35	35	stage/sql/Executing	(stage)	STATEMENT	24
+36	36	stage/sql/End of update loop	(stage)	STATEMENT	24
+37	37	stage/sql/Query end	(stage)	STATEMENT	24
+38	38	stage/sql/Commit	(stage)	STATEMENT	24
+39	39	stage/sql/closing tables	(stage)	STATEMENT	24
+40	40	stage/sql/Starting cleanup	(stage)	STATEMENT	24
+41	41	stage/sql/Freeing items	(stage)	STATEMENT	24
+42	42	wait/io/socket/sql/client_connection	send	STATEMENT	24
+43	43	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	24
+44	45	stage/sql/Reset for next command	(stage)	STATEMENT	24
+45	45	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	44
+46	46	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STATEMENT	24
+47	47	idle	idle	NULL	NULL
+48	69	statement/sql/select	select "This is simple statement two" as payload	NULL	NULL
+49	53	stage/sql/starting	(stage)	STATEMENT	48
+50	50	wait/io/socket/sql/client_connection	recv	STAGE	49
+51	51	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	49
+52	52	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	49
+53	53	wait/io/file/sql/query_log	write	STAGE	49
+54	54	stage/sql/checking permissions	(stage)	STATEMENT	48
+55	55	stage/sql/Opening tables	(stage)	STATEMENT	48
+56	56	stage/sql/After opening tables	(stage)	STATEMENT	48
+57	57	stage/sql/init	(stage)	STATEMENT	48
+58	58	stage/sql/Optimizing	(stage)	STATEMENT	48
+59	59	stage/sql/Executing	(stage)	STATEMENT	48
+60	60	stage/sql/End of update loop	(stage)	STATEMENT	48
+61	61	stage/sql/Query end	(stage)	STATEMENT	48
+62	62	stage/sql/Commit	(stage)	STATEMENT	48
+63	63	stage/sql/closing tables	(stage)	STATEMENT	48
+64	64	stage/sql/Starting cleanup	(stage)	STATEMENT	48
+65	65	stage/sql/Freeing items	(stage)	STATEMENT	48
+66	66	wait/io/socket/sql/client_connection	send	STATEMENT	48
+67	67	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	48
+68	69	stage/sql/Reset for next command	(stage)	STATEMENT	48
+69	69	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	68
+70	70	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STATEMENT	48
+71	71	idle	idle	NULL	NULL
+72	92	statement/sql/select	select "This is the first part of a multi query" as payload;
 select "And this is the second part of a multi query" as payload;
 select "With a third part to make things complete" as payload	NULL	NULL
-67	71	stage/sql/starting	(stage)	STATEMENT	66
-68	68	wait/io/socket/sql/client_connection	recv	STAGE	67
-69	69	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	67
-70	70	wait/io/file/sql/query_log	write	STAGE	67
-71	71	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	67
-72	72	stage/sql/checking permissions	(stage)	STATEMENT	66
-73	73	stage/sql/Opening tables	(stage)	STATEMENT	66
-74	74	stage/sql/After opening tables	(stage)	STATEMENT	66
-75	75	stage/sql/init	(stage)	STATEMENT	66
-76	76	stage/sql/Optimizing	(stage)	STATEMENT	66
-77	77	stage/sql/Executing	(stage)	STATEMENT	66
-78	78	stage/sql/End of update loop	(stage)	STATEMENT	66
-79	79	stage/sql/Query end	(stage)	STATEMENT	66
-80	80	stage/sql/Commit	(stage)	STATEMENT	66
-81	81	stage/sql/closing tables	(stage)	STATEMENT	66
-82	82	stage/sql/Starting cleanup	(stage)	STATEMENT	66
-83	85	stage/sql/Freeing items	(stage)	STATEMENT	66
-84	84	wait/io/socket/sql/client_connection	send	STAGE	83
-85	85	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STAGE	83
-86	103	statement/sql/select	select "And this is the second part of a multi query" as payload;
+73	78	stage/sql/starting	(stage)	STATEMENT	72
+74	74	wait/io/socket/sql/client_connection	recv	STAGE	73
+75	75	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	73
+76	76	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	73
+77	77	wait/io/file/sql/query_log	write	STAGE	73
+78	78	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	73
+79	79	stage/sql/checking permissions	(stage)	STATEMENT	72
+80	80	stage/sql/Opening tables	(stage)	STATEMENT	72
+81	81	stage/sql/After opening tables	(stage)	STATEMENT	72
+82	82	stage/sql/init	(stage)	STATEMENT	72
+83	83	stage/sql/Optimizing	(stage)	STATEMENT	72
+84	84	stage/sql/Executing	(stage)	STATEMENT	72
+85	85	stage/sql/End of update loop	(stage)	STATEMENT	72
+86	86	stage/sql/Query end	(stage)	STATEMENT	72
+87	87	stage/sql/Commit	(stage)	STATEMENT	72
+88	88	stage/sql/closing tables	(stage)	STATEMENT	72
+89	89	stage/sql/Starting cleanup	(stage)	STATEMENT	72
+90	92	stage/sql/Freeing items	(stage)	STATEMENT	72
+91	91	wait/io/socket/sql/client_connection	send	STAGE	90
+92	92	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STAGE	90
+93	110	statement/sql/select	select "And this is the second part of a multi query" as payload;
 select "With a third part to make things complete" as payload	NULL	NULL
-87	89	stage/sql/starting	(stage)	STATEMENT	86
-88	88	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	87
-89	89	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	87
-90	90	stage/sql/checking permissions	(stage)	STATEMENT	86
-91	91	stage/sql/Opening tables	(stage)	STATEMENT	86
-92	92	stage/sql/After opening tables	(stage)	STATEMENT	86
-93	93	stage/sql/init	(stage)	STATEMENT	86
-94	94	stage/sql/Optimizing	(stage)	STATEMENT	86
-95	95	stage/sql/Executing	(stage)	STATEMENT	86
-96	96	stage/sql/End of update loop	(stage)	STATEMENT	86
-97	97	stage/sql/Query end	(stage)	STATEMENT	86
-98	98	stage/sql/Commit	(stage)	STATEMENT	86
-99	99	stage/sql/closing tables	(stage)	STATEMENT	86
-100	100	stage/sql/Starting cleanup	(stage)	STATEMENT	86
-101	103	stage/sql/Freeing items	(stage)	STATEMENT	86
-102	102	wait/io/socket/sql/client_connection	send	STAGE	101
-103	103	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STAGE	101
-104	122	statement/sql/select	select "With a third part to make things complete" as payload	NULL	NULL
-105	106	stage/sql/starting	(stage)	STATEMENT	104
-106	106	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	105
-107	107	stage/sql/checking permissions	(stage)	STATEMENT	104
-108	108	stage/sql/Opening tables	(stage)	STATEMENT	104
-109	109	stage/sql/After opening tables	(stage)	STATEMENT	104
-110	110	stage/sql/init	(stage)	STATEMENT	104
-111	111	stage/sql/Optimizing	(stage)	STATEMENT	104
-112	112	stage/sql/Executing	(stage)	STATEMENT	104
-113	113	stage/sql/End of update loop	(stage)	STATEMENT	104
-114	114	stage/sql/Query end	(stage)	STATEMENT	104
-115	115	stage/sql/Commit	(stage)	STATEMENT	104
-116	116	stage/sql/closing tables	(stage)	STATEMENT	104
-117	117	stage/sql/Starting cleanup	(stage)	STATEMENT	104
-118	118	stage/sql/Freeing items	(stage)	STATEMENT	104
-119	119	wait/io/socket/sql/client_connection	send	STATEMENT	104
-120	120	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	104
-121	122	stage/sql/Reset for next command	(stage)	STATEMENT	104
-122	122	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	121
-123	123	idle	idle	NULL	NULL
-124	144	statement/sql/select	select "MARKER_END" as marker	NULL	NULL
-125	128	stage/sql/starting	(stage)	STATEMENT	124
-126	126	wait/io/socket/sql/client_connection	recv	STAGE	125
-127	127	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	125
-128	128	wait/io/file/sql/query_log	write	STAGE	125
-129	129	stage/sql/checking permissions	(stage)	STATEMENT	124
-130	130	stage/sql/Opening tables	(stage)	STATEMENT	124
-131	131	stage/sql/After opening tables	(stage)	STATEMENT	124
-132	132	stage/sql/init	(stage)	STATEMENT	124
-133	133	stage/sql/Optimizing	(stage)	STATEMENT	124
-134	134	stage/sql/Executing	(stage)	STATEMENT	124
-135	135	stage/sql/End of update loop	(stage)	STATEMENT	124
-136	136	stage/sql/Query end	(stage)	STATEMENT	124
-137	137	stage/sql/Commit	(stage)	STATEMENT	124
-138	138	stage/sql/closing tables	(stage)	STATEMENT	124
-139	139	stage/sql/Starting cleanup	(stage)	STATEMENT	124
-140	140	stage/sql/Freeing items	(stage)	STATEMENT	124
-141	141	wait/io/socket/sql/client_connection	send	STATEMENT	124
-142	142	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	124
-143	144	stage/sql/Reset for next command	(stage)	STATEMENT	124
-144	144	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	143
+94	96	stage/sql/starting	(stage)	STATEMENT	93
+95	95	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	94
+96	96	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	94
+97	97	stage/sql/checking permissions	(stage)	STATEMENT	93
+98	98	stage/sql/Opening tables	(stage)	STATEMENT	93
+99	99	stage/sql/After opening tables	(stage)	STATEMENT	93
+100	100	stage/sql/init	(stage)	STATEMENT	93
+101	101	stage/sql/Optimizing	(stage)	STATEMENT	93
+102	102	stage/sql/Executing	(stage)	STATEMENT	93
+103	103	stage/sql/End of update loop	(stage)	STATEMENT	93
+104	104	stage/sql/Query end	(stage)	STATEMENT	93
+105	105	stage/sql/Commit	(stage)	STATEMENT	93
+106	106	stage/sql/closing tables	(stage)	STATEMENT	93
+107	107	stage/sql/Starting cleanup	(stage)	STATEMENT	93
+108	110	stage/sql/Freeing items	(stage)	STATEMENT	93
+109	109	wait/io/socket/sql/client_connection	send	STAGE	108
+110	110	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STAGE	108
+111	129	statement/sql/select	select "With a third part to make things complete" as payload	NULL	NULL
+112	113	stage/sql/starting	(stage)	STATEMENT	111
+113	113	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	112
+114	114	stage/sql/checking permissions	(stage)	STATEMENT	111
+115	115	stage/sql/Opening tables	(stage)	STATEMENT	111
+116	116	stage/sql/After opening tables	(stage)	STATEMENT	111
+117	117	stage/sql/init	(stage)	STATEMENT	111
+118	118	stage/sql/Optimizing	(stage)	STATEMENT	111
+119	119	stage/sql/Executing	(stage)	STATEMENT	111
+120	120	stage/sql/End of update loop	(stage)	STATEMENT	111
+121	121	stage/sql/Query end	(stage)	STATEMENT	111
+122	122	stage/sql/Commit	(stage)	STATEMENT	111
+123	123	stage/sql/closing tables	(stage)	STATEMENT	111
+124	124	stage/sql/Starting cleanup	(stage)	STATEMENT	111
+125	125	stage/sql/Freeing items	(stage)	STATEMENT	111
+126	126	wait/io/socket/sql/client_connection	send	STATEMENT	111
+127	127	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	111
+128	129	stage/sql/Reset for next command	(stage)	STATEMENT	111
+129	129	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	128
+130	130	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STATEMENT	111
+131	131	idle	idle	NULL	NULL
+132	153	statement/sql/select	select "MARKER_END" as marker	NULL	NULL
+133	137	stage/sql/starting	(stage)	STATEMENT	132
+134	134	wait/io/socket/sql/client_connection	recv	STAGE	133
+135	135	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	133
+136	136	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	133
+137	137	wait/io/file/sql/query_log	write	STAGE	133
+138	138	stage/sql/checking permissions	(stage)	STATEMENT	132
+139	139	stage/sql/Opening tables	(stage)	STATEMENT	132
+140	140	stage/sql/After opening tables	(stage)	STATEMENT	132
+141	141	stage/sql/init	(stage)	STATEMENT	132
+142	142	stage/sql/Optimizing	(stage)	STATEMENT	132
+143	143	stage/sql/Executing	(stage)	STATEMENT	132
+144	144	stage/sql/End of update loop	(stage)	STATEMENT	132
+145	145	stage/sql/Query end	(stage)	STATEMENT	132
+146	146	stage/sql/Commit	(stage)	STATEMENT	132
+147	147	stage/sql/closing tables	(stage)	STATEMENT	132
+148	148	stage/sql/Starting cleanup	(stage)	STATEMENT	132
+149	149	stage/sql/Freeing items	(stage)	STATEMENT	132
+150	150	wait/io/socket/sql/client_connection	send	STATEMENT	132
+151	151	wait/synch/mutex/sql/THD::LOCK_thd_kill	lock	STATEMENT	132
+152	153	stage/sql/Reset for next command	(stage)	STATEMENT	132
+153	153	wait/synch/mutex/sql/THD::LOCK_thd_data	lock	STAGE	152
 disconnect con1;