diff options
Diffstat (limited to 'mysql-test/main/execution_constants.test')
| -rw-r--r-- | mysql-test/main/execution_constants.test | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/mysql-test/main/execution_constants.test b/mysql-test/main/execution_constants.test new file mode 100644 index 00000000000..285197cd1f4 --- /dev/null +++ b/mysql-test/main/execution_constants.test @@ -0,0 +1,84 @@ +# In embedded server we don't really have a control over stack usage +-- source include/not_embedded.inc + +# +# Bug#21476: Lost Database Connection During Query +# +# When the amount of stack space we think we need to report an error is +# actually too small, then we can get SEGVs. But, we don't want to reserve +# space that we could use to get real work done. So, we want the reserved +# space small, and this test verifies that the reservation is not too small. + +CREATE TABLE `t_bug21476` ( + `ID_BOARD` smallint(5) unsigned NOT NULL default '0', + `ID_MEMBER` mediumint(8) unsigned NOT NULL default '0', + `logTime` int(10) unsigned NOT NULL default '0', + `ID_MSG` mediumint(8) unsigned NOT NULL default '0', + PRIMARY KEY (`ID_MEMBER`,`ID_BOARD`), + KEY `logTime` (`logTime`) +) ENGINE=MyISAM DEFAULT CHARSET=cp1251 COLLATE=cp1251_bulgarian_ci; + +INSERT INTO `t_bug21476` VALUES (2,2,1154870939,0),(1,2,1154870957,0),(2,183,1154941362,0),(2,84,1154904301,0),(1,84,1154905867,0),(2,13,1154947484,10271),(3,84,1154880549,0),(1,6,1154892183,0),(2,25,1154947581,10271),(3,25,1154904760,0),(1,25,1154947373,10271),(1,179,1154899992,0),(2,179,1154899410,0),(5,25,1154901666,0),(2,329,1154902026,0),(3,329,1154902040,0),(1,329,1154902058,0),(1,13,1154930841,0),(3,85,1154904987,0),(1,183,1154929665,0),(3,13,1154931268,0),(1,85,1154936888,0),(1,169,1154937959,0),(2,169,1154941717,0),(3,183,1154939810,0),(3,169,1154941734,0); + +delimiter //; +let $query_head=UPDATE t_bug21476 SET ID_MSG = IF(logTime BETWEEN 1 AND 1101770053, 2, // +let $query_tail =) WHERE logTime BETWEEN 1 AND 1104091539 AND ID_MSG = 0// + +# Scan over the possible stack heights, trying to recurse to exactly that +# depth. Eventually, we will reach our imposed limit on height and try to +# raise an error. If the remaining stack space is enough to raise that error, +# we will get an error-number of 1436 and quit the loop. If it's not enough +# space, we should get a SEGV + +# Well more than enough recursions to find the end of our stack. +let $i = 100000// +disable_query_log// +disable_result_log// +while ($i) +{ + # If we SEGV because the min stack size is exceeded, this would return error + # 2013 . + error 0,ER_STACK_OVERRUN_NEED_MORE // + eval $query_head 0 $query_tail// + + if ($mysql_errno) + { + # We reached the place where we reported an error about the stack limit, + # and we successfully returned the error. That means that at the stack + # limit, we still have enough space reserved to report an error. + let $i = 1// + + # Check that mysql_errname is ER_STACK_OVERRUN_NEED_MORE + if ($mysql_errname != ER_STACK_OVERRUN_NEED_MORE) + { + die Wrong error triggered, expected ER_STACK_OVERRUN_NEED_MORE but got $mysql_errname// + } + + } + + # Multiplying by three stack frames should be fine enough resolution. + # Trading exactness for speed. + + # go one more level deep + let $query_head = $query_head IF(logTime <= 1104091$i, $i, // + let $query_tail =) $query_tail// + + # go one more level deep + let $query_head = $query_head IF(logTime <= 1105091$i, $i, // + let $query_tail =) $query_tail// + + # go one more level deep + let $query_head = $query_head IF(logTime <= 1106091$i, $i, // + let $query_tail =) $query_tail// + + dec $i// +} +enable_result_log// +enable_query_log// + +echo Assertion: mysql_errname ER_STACK_OVERRUN_NEED_MORE == $mysql_errname// + +delimiter ;// +DROP TABLE `t_bug21476`; + +--echo End of 5.0 tests. |