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---------------------------------------------------------- revno: 2617.69.21 committer: Konstantin Osipov <kostja@sun.com> branch nick: 5.4-4284-1-assert timestamp: Thu 2009-08-13 20:13:55 +0400 message: A fix and a test case for Bug#46610 "MySQL 5.4.4: MyISAM MRG engine crash on auto-repair of child". Also fixes Bug#42862 "Crash on failed attempt to open a children of a merge table". MERGE engine needs to extend the global table list with TABLE_LIST elements for child tables, so that they are opened and locked. Previously these table list elements were allocated in memory of ha_myisammrg object (MERGE engine handler). That would lead to access to freed memory in recover_from_failed_open_table_attempt(), which would try to recover a MERGE table child (MyISAM table) and use for that TABLE_LIST of that child. But by the time recover_from_failed_open_table_attempt() is invoked, ha_myisammrg object that owns this TABLE_LIST may be destroyed, and thus TABLE_LIST memory freed. The fix is to ensure that TABLE_LIST elements that are added to the global table list (lex->query_tables) are always allocated in thd->mem_root, which is not destroyed until end of execution. If previously TABLE_LIST elements were allocated at ha_myisammrg::open() (i.e. when the TABLE object was created and added to the table cache), now they are allocated in ha_myisammrg::add_chidlren_list() (i.e. right after "open" of the merge parent in open_tables()). We still create a list of children names at ha_myisammrg::open() to use as a basis for creation of TABLE_LISTs, that allows to avoid reading the merge handler data file on every execution.
104 lines
2.9 KiB
Plaintext
104 lines
2.9 KiB
Plaintext
#
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# Test of MyISAM MRG tables with corrupted children.
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# Run with --myisam-recover=force option.
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#
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# Preparation: we need to make sure that the merge parent
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# is never left in the table cache when closed, since this may
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# have effect on merge children.
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# For that, we set the table cache to minimal size and populate it
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# in a concurrent connection.
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#
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# Switching to connection con1
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#
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#
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# Minimal values.
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#
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call mtr.add_suppression("Got an error from thread_id=.*ha_myisam.cc:");
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call mtr.add_suppression("MySQL thread id .*, query id .* localhost.*root Checking table");
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call mtr.add_suppression(" '\..test.t1'");
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set global table_open_cache=256;
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set global table_definition_cache=400;
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drop procedure if exists p_create;
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create procedure p_create()
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begin
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declare i int default 1;
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set @lock_table_stmt="lock table ";
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set @drop_table_stmt="drop table ";
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while i < @@global.table_definition_cache + 1 do
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set @table_name=concat("t_", i);
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set @opt_comma=if(i=1, "", ", ");
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set @lock_table_stmt=concat(@lock_table_stmt, @opt_comma,
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@table_name, " read");
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set @drop_table_stmt=concat(@drop_table_stmt, @opt_comma, @table_name);
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set @create_table_stmt=concat("create table if not exists ",
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@table_name, " (a int)");
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prepare stmt from @create_table_stmt;
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execute stmt;
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deallocate prepare stmt;
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set i= i+1;
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end while;
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end|
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call p_create();
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drop procedure p_create;
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#
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# Switching to connection 'default'
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#
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#
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# We have to disable the ps-protocol, to avoid
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# "Prepared statement needs to be re-prepared" errors
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# -- table def versions change all the time with full table cache.
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#
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drop table if exists t1, t1_mrg, t1_copy;
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#
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# Prepare a MERGE engine table, that refers to a corrupted
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# child.
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#
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create table t1 (a int, key(a)) engine=myisam;
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create table t1_mrg (a int) union (t1) engine=merge;
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#
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# Create a table with a corrupted index file:
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# save an old index file, insert more rows,
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# overwrite the new index file with the old one.
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#
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insert into t1 (a) values (1), (2), (3);
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flush table t1;
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insert into t1 (a) values (4), (5), (6);
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flush table t1;
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# check table is needed to mark the table as crashed.
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check warning Size of datafile is: 42 Should be: 21
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test.t1 check error Record-count is not ok; is 6 Should be: 3
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test.t1 check warning Found 6 key parts. Should be: 3
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test.t1 check error Corrupt
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#
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# At this point we have a merge table t1_mrg pointing to t1,
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# and t1 is corrupted, and will be auto-repaired at open.
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# Check that this doesn't lead to memory corruption.
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#
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select * from t1_mrg;
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a
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1
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2
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3
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4
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5
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6
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Warnings:
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Error 145 Table 't1' is marked as crashed and should be repaired
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Error 1194 Table 't1' is marked as crashed and should be repaired
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Error 1034 Number of rows changed from 3 to 6
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#
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# Cleanup
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#
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drop table t1, t1_mrg;
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#
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# Switching to connection con1
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#
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unlock tables;
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prepare stmt from @drop_table_stmt;
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execute stmt;
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deallocate prepare stmt;
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set @@global.table_definition_cache=default;
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set @@global.table_open_cache=default;
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