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7e36c4bdb0
There are two threads. In one thread, dml operation is going on
involving cascaded update operation. In another thread, alter
table add foreign key constraint is happening. Under these
circumstances, it is possible for the dml thread to access a
dict_foreign_t object that has been freed by the ddl thread.
The debug sync test case provides the sequence of operations.
Without fix, the test case will crash the server (because of
newly added assert). With fix, the alter table stmt will return
an error message.
Backporting the fix from MySQL 5.5 to 5.1
rb:961
rb:947
45 lines
1.6 KiB
Text
45 lines
1.6 KiB
Text
SET DEBUG_SYNC='reset';
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create table t1 (f1 integer, key k1 (f1)) engine=innodb;
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create table t2 (f1 int, f2 int, key(f1), key(f2)) engine=innodb;
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create table t3 (f2 int, key(f2)) engine=innodb;
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insert into t1 values (10);
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insert into t2 values (10, 20);
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insert into t3 values (20);
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alter table t2 add constraint c1 foreign key (f1)
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references t1(f1) on update cascade;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`f1` int(11) DEFAULT NULL,
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KEY `k1` (`f1`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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show create table t2;
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Table Create Table
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t2 CREATE TABLE `t2` (
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`f1` int(11) DEFAULT NULL,
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`f2` int(11) DEFAULT NULL,
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KEY `f1` (`f1`),
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KEY `f2` (`f2`),
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CONSTRAINT `c1` FOREIGN KEY (`f1`) REFERENCES `t1` (`f1`) ON UPDATE CASCADE
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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show create table t3;
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Table Create Table
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t3 CREATE TABLE `t3` (
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`f2` int(11) DEFAULT NULL,
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KEY `f2` (`f2`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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SET DEBUG_SYNC='innodb_rename_table_ready SIGNAL update_can_proceed
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WAIT_FOR dict_unfreeze';
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alter table t2 add constraint z1 foreign key (f2)
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references t3(f2) on update cascade;
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SET DEBUG_SYNC='innodb_row_update_for_mysql_begin
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WAIT_FOR update_can_proceed';
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SET DEBUG_SYNC='innodb_dml_cascade_dict_unfreeze SIGNAL dict_unfreeze
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WAIT_FOR foreign_free_cache';
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update ignore t1 set f1 = 20;
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ERROR HY000: Error on rename of './test/t2' to '#sql2-temporary' (errno: 181)
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SET DEBUG_SYNC='now SIGNAL foreign_free_cache';
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drop table t2;
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drop table t1;
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drop table t3;
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SET DEBUG_SYNC='reset';
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