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Bug#45781 infinite hang/crash in "opening tables" after handler tries to open merge

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table

The MERGE table storage engine does not support the HA_CAN_SQL_HANDLE feature
and any attempt to open the merge table will fail with ER_ILLEGAL_HA.

After an error occurred the tables that was opened must be closed again
or they will be left in an inconsistent state. However, the assumption
made in the code for closing and register handler tables was that only
one table will be opened, and this is not true for MERGE tables which
will cause multiple tables to open.

The next time a SELECT operation was issued on the merge table it
caused the system to freeze.

This patch fixes this issue by making sure that all tables which
are opened also are closed in the event of an error.
This commit is contained in:
Kristofer Pettersson
2009-07-16 01:23:57 +02:00
parent 5b178e9a2a
commit c9df2a13ac
3 changed files with 70 additions and 3 deletions
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20
mysql-test/r/merge.result
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@@ -2141,4 +2141,24 @@ SELECT * FROM m1;
c1
DROP TABLE m1;
DROP TABLE t1;
#
# Bug45781 infinite hang/crash in "opening tables" after handler tries to
# open merge table
#
DROP TABLE IF EXISTS m1,t1;
CREATE TABLE t1(a int)engine=myisam;
CREATE TABLE t2(a int)engine=myisam;
CREATE TABLE t3(a int)engine=myisam;
CREATE TABLE t4(a int)engine=myisam;
CREATE TABLE t5(a int)engine=myisam;
CREATE TABLE t6(a int)engine=myisam;
CREATE TABLE t7(a int)engine=myisam;
CREATE TABLE m1(a int)engine=merge union=(t1,t2,t3,t4,t5,t6,t7);
SELECT 1 FROM m1;
1
HANDLER m1 OPEN;
ERROR HY000: Table storage engine for 'm1' doesn't have this option
DROP TABLE m1,t1,t2,t3,t4,t5,t6,t7;
SELECT 1 FROM m1;
ERROR 42S02: Table 'test.m1' doesn't exist
End of 5.1 tests