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Bug #56494 Segfault in upgrade_shared_lock_to_exclusive() for

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REPAIR of merge table
Bug #56422 CHECK TABLE run when the table is locked reports
           corruption along with timeout

The crash happened if a table maintenance statement (ANALYZE TABLE,
REPAIR TABLE, etc.) was executed on a MERGE table and opening and 
locking a child table failed. This could for example happen if a child
table did not exist or if a lock timeout happened while waiting for
a conflicting metadata lock to disappear.

Since opening and locking the MERGE table and its children failed,
the tables would be closed and the metadata locks released.
However, TABLE_LIST::table for the MERGE table would still be set,
with its value invalid since the tables had been closed.
This caused the table maintenance statement to try to continue
and upgrade the metadata lock on the MERGE table. But since the lock
already had been released, this caused a segfault.

This patch fixes the problem by setting TABLE_LIST::table to NULL 
if open_and_lock_tables() fails. This prevents maintenance
statements from continuing and trying to upgrade the metadata lock.

The patch includes a 5.5 version of the fix for
Bug #46339 crash on REPAIR TABLE merge table USE_FRM.
This bug caused REPAIR TABLE ... USE_FRM to give an assert 
when used on merge tables.

The patch also enables the CHECK TABLE statement for log tables.
Before, CHECK TABLE for log tables gave ER_CANT_LOCK_LOG_TABLE,
yet still counted the statement as successfully executed.
With the changes to table maintenance statement error handling
in this patch, CHECK TABLE would no longer be considered as
successful in this case. This would have caused upgrade scripts
to mistakenly think that the general and slow logs are corrupted
and have to be repaired. Enabling CHECK TABLES for log tables
prevents this from happening.

Finally, the patch changes the error message from "Corrupt" to
"Operation failed" for a number of issues not related to table
corruption. For example "Lock wait timeout exceeded" and 
"Deadlock found trying to get lock".

Test cases added to merge.test and check.test.
This commit is contained in:
Jon Olav Hauglid
2010-09-22 10:15:41 +02:00
parent 1818165cdb
commit 5d06dddff3
10 changed files with 295 additions and 63 deletions
Download Patch File Download Diff File Expand all files Collapse all files

88
mysql-test/r/merge.result
View File

@ -2358,6 +2358,48 @@ t2 WHERE b SOUNDS LIKE e AND d = 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
DROP TABLE t2, t1;
#
# Bug#46339 - crash on REPAIR TABLE merge table USE_FRM
#
DROP TABLE IF EXISTS m1, t1;
CREATE TABLE t1 (c1 INT) ENGINE=MYISAM;
CREATE TABLE m1 (c1 INT) ENGINE=MRG_MyISAM UNION=(t1) INSERT_METHOD=LAST;
LOCK TABLE m1 READ;
REPAIR TABLE m1 USE_FRM;
Table Op Msg_type Msg_text
test.m1 repair Error Table 'm1' was locked with a READ lock and can't be updated
test.m1 repair status Operation failed
UNLOCK TABLES;
REPAIR TABLE m1 USE_FRM;
Table Op Msg_type Msg_text
test.m1 repair note The storage engine for the table doesn't support repair
DROP TABLE m1,t1;
CREATE TABLE m1 (f1 BIGINT) ENGINE=MRG_MyISAM UNION(t1);
REPAIR TABLE m1 USE_FRM;
Table Op Msg_type Msg_text
test.m1 repair Warning Can't open table
test.m1 repair error Corrupt
CREATE TABLE t1 (f1 BIGINT) ENGINE = MyISAM;
REPAIR TABLE m1 USE_FRM;
Table Op Msg_type Msg_text
test.m1 repair note The storage engine for the table doesn't support repair
REPAIR TABLE m1;
Table Op Msg_type Msg_text
test.m1 repair note The storage engine for the table doesn't support repair
DROP TABLE m1, t1;
CREATE TEMPORARY TABLE m1 (f1 BIGINT) ENGINE=MRG_MyISAM UNION(t1);
REPAIR TABLE m1 USE_FRM;
Table Op Msg_type Msg_text
test.m1 repair Error Table 'test.m1' doesn't exist
test.m1 repair error Corrupt
CREATE TEMPORARY TABLE t1 (f1 BIGINT) ENGINE=MyISAM;
REPAIR TABLE m1 USE_FRM;
Table Op Msg_type Msg_text
m1 repair error Cannot repair temporary table from .frm file
REPAIR TABLE m1;
Table Op Msg_type Msg_text
test.m1 repair note The storage engine for the table doesn't support repair
DROP TABLE m1, t1;
End of 5.1 tests
#
# An additional test case for Bug#27430 Crash in subquery code
@ -2677,7 +2719,7 @@ OPTIMIZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 optimize Error Table 'test.t_not_exists' doesn't exist
test.t1 optimize Error Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1 optimize note The storage engine for the table doesn't support optimize
test.t1 optimize error Corrupt
DROP TABLE t1;
#
# Bug#36171 - CREATE TEMPORARY TABLE and MERGE engine
@ -3575,4 +3617,48 @@ ERROR HY000: The definition of table 'v1' prevents operation DELETE on table 'm1
drop view v1;
drop temporary table tmp;
drop table t1, t2, t3, m1, m2;
#
# Bug#56494 Segfault in upgrade_shared_lock_to_exclusive() for
# REPAIR of merge table
#
DROP TABLE IF EXISTS t1, t2, t_not_exists;
CREATE TABLE t1(a INT);
ALTER TABLE t1 engine= MERGE UNION (t_not_exists);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze Error Table 'test.t_not_exists' doesn't exist
test.t1 analyze Error Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1 analyze error Corrupt
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check Error Table 'test.t_not_exists' doesn't exist
test.t1 check Error Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1 check error Corrupt
CHECKSUM TABLE t1;
Table Checksum
test.t1 NULL
Warnings:
Error 1146 Table 'test.t_not_exists' doesn't exist
Error 1168 Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
OPTIMIZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 optimize Error Table 'test.t_not_exists' doesn't exist
test.t1 optimize Error Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1 optimize error Corrupt
REPAIR TABLE t1;
Table Op Msg_type Msg_text
test.t1 repair Error Table 'test.t_not_exists' doesn't exist
test.t1 repair Error Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1 repair error Corrupt
REPAIR TABLE t1 USE_FRM;
Table Op Msg_type Msg_text
test.t1 repair Warning Can't open table
test.t1 repair error Corrupt
DROP TABLE t1;
CREATE TABLE t1(a INT);
CREATE TABLE t2(a INT) engine= MERGE UNION (t1);
REPAIR TABLE t2 USE_FRM;
Table Op Msg_type Msg_text
test.t2 repair note The storage engine for the table doesn't support repair
DROP TABLE t1, t2;
End of 6.0 tests