1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
#
# Code coverage testing of TRUNCATE TABLE.
#
# Ingo Struewing, 2009-07-20
#
--source include/have_debug_sync.inc
SET DEBUG_SYNC='RESET';
--let $MYSQLD_DATADIR= `SELECT @@datadir`
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
--echo #
--echo # Bug#20667 - Truncate table fails for a write locked table
--echo #
########
# Attack wait_while_table_is_used(). Kill query while trying to
# upgrade MDL.
#
CREATE TABLE t1 (c1 INT);
INSERT INTO t1 VALUES (1);
#
# Acquire a shared metadata lock on table by opening HANDLER for it and wait.
# TRUNCATE shall block on this metadata lock.
# We can't use normal DML as such statements would also block LOCK TABLES.
#
--echo #
--echo # connection con1
--connect (con1, localhost, root,,)
HANDLER t1 OPEN;
#
# Get connection id of default connection.
# Lock the table and start TRUNCATE, which will block on MDL upgrade.
#
--echo #
--echo # connection default
--connection default
let $ID= `SELECT @id := CONNECTION_ID()`;
LOCK TABLE t1 WRITE;
SET DEBUG_SYNC='mdl_upgrade_shared_lock_to_exclusive SIGNAL waiting';
send TRUNCATE TABLE t1;
#
# Get the default connection ID into a variable in an invisible statement.
# Kill the TRUNCATE query. This shall result in an error return
# from wait_while_table_is_used().
#
--echo #
--echo # connection con2
--connect (con2, localhost, root,,)
SET DEBUG_SYNC='now WAIT_FOR waiting';
let $invisible_assignment_in_select = `SELECT @id := $ID`;
KILL QUERY @id;
--disconnect con2
--echo #
--echo # connection con1
--connection con1
--echo # Release shared metadata lock by closing HANDLER.
HANDLER t1 CLOSE;
--disconnect con1
--echo #
--echo # connection default
--connection default
--error ER_QUERY_INTERRUPTED
reap;
UNLOCK TABLES;
DROP TABLE t1;
SET DEBUG_SYNC='RESET';
########
# Attack reopen_tables(). Remove form file.
#
CREATE TABLE t1 (c1 INT);
INSERT INTO t1 VALUES (1);
#
# Acquire a shared metadata lock on table by opening HANDLER for it and wait.
# TRUNCATE shall block on this metadata lock.
# We can't use normal DML as such statements would also block LOCK TABLES.
#
--echo #
--echo # connection con1
--connect (con1, localhost, root,,)
HANDLER t1 OPEN;
#
# Lock the table and start TRUNCATE, which will block on MDL upgrade.
#
--echo #
--echo # connection default
--connection default
LOCK TABLE t1 WRITE;
SET DEBUG_SYNC='mdl_upgrade_shared_lock_to_exclusive SIGNAL waiting';
send TRUNCATE TABLE t1;
#
# Remove datafile.
# Commit to let TRUNCATE continue.
#
--echo #
--echo # connection con2
--connect (con2, localhost, root,,)
SET DEBUG_SYNC='now WAIT_FOR waiting';
--remove_file $MYSQLD_DATADIR/test/t1.frm
--disconnect con2
--echo #
--echo # connection con1
--connection con1
HANDLER t1 CLOSE;
--disconnect con1
--echo #
--echo # connection default
--connection default
--error ER_NO_SUCH_TABLE
reap;
UNLOCK TABLES;
--error ER_BAD_TABLE_ERROR
DROP TABLE t1;
SET DEBUG_SYNC='RESET';
########
# Attack acquire_exclusive_locks(). Hold a global read lock.
# Non-LOCK TABLE case.
#
CREATE TABLE t1 (c1 INT);
INSERT INTO t1 VALUES (1);
#
# Start a transaction and execute a DML in it. Since 5.4.4 this leaves
# a shared meta data lock (MDL) behind. TRUNCATE shall block on it.
#
--echo #
--echo # connection con1
--connect (con1, localhost, root,,)
START TRANSACTION;
INSERT INTO t1 VALUES (2);
#
# Get connection id of default connection.
# Start TRUNCATE, which will block on acquire_exclusive_locks().
#
--echo #
--echo # connection default
--connection default
let $ID= `SELECT @id := CONNECTION_ID()`;
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL waiting';
send TRUNCATE TABLE t1;
#
# Get the default connection ID into a variable in an invisible statement.
# Kill the TRUNCATE query. This shall result in an error return
# from wait_while_table_is_used().
#
--echo #
--echo # connection con1
--connection con1
SET DEBUG_SYNC='now WAIT_FOR waiting';
let $invisible_assignment_in_select = `SELECT @id := $ID`;
KILL QUERY @id;
COMMIT;
--disconnect con1
--echo #
--echo # connection default
--connection default
--error ER_QUERY_INTERRUPTED
reap;
UNLOCK TABLES;
DROP TABLE t1;
SET DEBUG_SYNC='RESET';
|
