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60a2bbb8dd
"freeing items" The calculation of the table map log event in the event constructor was one byte shorter than what would be actually written. This would lead to a mismatch between the number of bytes written and the event end_log_pos, causing bad event alignment in the binlog (corrupted binlog) or in the transaction cache while fixing positions (MYSQL_BIN_LOG::write_cache). This could lead to impossible to read binlog or even infinite loops in MYSQL_BIN_LOG::write_cache. This patch addresses this issue by correcting the expected event length in the Table_map_log_event constructor, when the field metadata size exceeds 255. sql/log_event.cc: Added the extra byte as net_store_length imposes.
199 lines
7 KiB
Text
199 lines
7 KiB
Text
#
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# BUG#42749: infinite loop writing to row based binlog - processlist shows
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# "freeing items"
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#
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# WHY
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# ===
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#
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# This bug would make table map event to report data_written one byte less
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# than what would actually be written in its body. This would cause one byte shorter
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# event end_log_pos. The ultimate impact was that it would make fixing the
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# position in MYSQL_BIN_LOG::write_cache bogus or end up in an infinite loop.
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#
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# HOW
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# ===
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#
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# Checking that the patch fixes the problem is done as follows:
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# i) a table with several fields is created;
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# ii) an insert is performed;
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# iii) the logs are flushed;
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# iv) mysqlbinlog is used to check if it succeeds.
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#
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# In step iv), before the bug was fixed, the test case would fail with
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# mysqlbinlog reporting that it was unable to succeed in reading the event.
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#
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-- source include/have_log_bin.inc
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-- source include/have_innodb.inc
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-- source include/have_binlog_format_row.inc
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-- connection default
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RESET MASTER;
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-- disable_warnings
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DROP TABLE IF EXISTS `t1`;
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-- enable_warnings
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CREATE TABLE `t1` (
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`c1` int(11) NOT NULL AUTO_INCREMENT,
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`c2` varchar(30) NOT NULL,
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`c3` varchar(30) DEFAULT NULL,
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`c4` varchar(30) DEFAULT NULL,
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`c5` varchar(30) DEFAULT NULL,
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`c6` varchar(30) DEFAULT NULL,
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`c7` varchar(30) DEFAULT NULL,
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`c8` varchar(30) DEFAULT NULL,
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`c9` varchar(30) DEFAULT NULL,
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`c10` varchar(30) DEFAULT NULL,
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`c11` varchar(30) DEFAULT NULL,
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`c12` varchar(30) DEFAULT NULL,
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`c13` varchar(30) DEFAULT NULL,
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`c14` varchar(30) DEFAULT NULL,
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`c15` varchar(30) DEFAULT NULL,
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`c16` varchar(30) DEFAULT NULL,
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`c17` varchar(30) DEFAULT NULL,
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`c18` varchar(30) DEFAULT NULL,
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`c19` varchar(30) DEFAULT NULL,
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`c20` varchar(30) DEFAULT NULL,
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`c21` varchar(30) DEFAULT NULL,
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`c22` varchar(30) DEFAULT NULL,
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`c23` varchar(30) DEFAULT NULL,
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`c24` varchar(30) DEFAULT NULL,
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`c25` varchar(30) DEFAULT NULL,
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`c26` varchar(30) DEFAULT NULL,
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`c27` varchar(30) DEFAULT NULL,
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`c28` varchar(30) DEFAULT NULL,
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`c29` varchar(30) DEFAULT NULL,
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`c30` varchar(30) DEFAULT NULL,
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`c31` varchar(30) DEFAULT NULL,
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`c32` varchar(30) DEFAULT NULL,
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`c33` varchar(30) DEFAULT NULL,
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`c34` varchar(30) DEFAULT NULL,
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`c35` varchar(30) DEFAULT NULL,
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`c36` varchar(30) DEFAULT NULL,
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`c37` varchar(30) DEFAULT NULL,
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`c38` varchar(30) DEFAULT NULL,
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`c39` varchar(30) DEFAULT NULL,
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`c40` varchar(30) DEFAULT NULL,
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`c41` varchar(30) DEFAULT NULL,
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`c42` varchar(30) DEFAULT NULL,
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`c43` varchar(30) DEFAULT NULL,
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`c44` varchar(30) DEFAULT NULL,
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`c45` varchar(30) DEFAULT NULL,
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`c46` varchar(30) DEFAULT NULL,
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`c47` varchar(30) DEFAULT NULL,
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`c48` varchar(30) DEFAULT NULL,
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`c49` varchar(30) DEFAULT NULL,
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`c50` varchar(30) DEFAULT NULL,
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`c51` varchar(30) DEFAULT NULL,
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`c52` varchar(30) DEFAULT NULL,
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`c53` varchar(30) DEFAULT NULL,
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`c54` varchar(30) DEFAULT NULL,
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`c55` varchar(30) DEFAULT NULL,
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`c56` varchar(30) DEFAULT NULL,
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`c57` varchar(30) DEFAULT NULL,
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`c58` varchar(30) DEFAULT NULL,
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`c59` varchar(30) DEFAULT NULL,
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`c60` varchar(30) DEFAULT NULL,
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`c61` varchar(30) DEFAULT NULL,
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`c62` varchar(30) DEFAULT NULL,
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`c63` varchar(30) DEFAULT NULL,
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`c64` varchar(30) DEFAULT NULL,
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`c65` varchar(30) DEFAULT NULL,
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`c66` varchar(30) DEFAULT NULL,
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`c67` varchar(30) DEFAULT NULL,
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`c68` varchar(30) DEFAULT NULL,
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`c69` varchar(30) DEFAULT NULL,
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`c70` varchar(30) DEFAULT NULL,
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`c71` varchar(30) DEFAULT NULL,
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`c72` varchar(30) DEFAULT NULL,
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`c73` varchar(30) DEFAULT NULL,
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`c74` varchar(30) DEFAULT NULL,
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`c75` varchar(30) DEFAULT NULL,
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`c76` varchar(30) DEFAULT NULL,
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`c77` varchar(30) DEFAULT NULL,
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`c78` varchar(30) DEFAULT NULL,
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`c79` varchar(30) DEFAULT NULL,
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`c80` varchar(30) DEFAULT NULL,
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`c81` varchar(30) DEFAULT NULL,
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`c82` varchar(30) DEFAULT NULL,
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`c83` varchar(30) DEFAULT NULL,
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`c84` varchar(30) DEFAULT NULL,
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`c85` varchar(30) DEFAULT NULL,
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`c86` varchar(30) DEFAULT NULL,
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`c87` varchar(30) DEFAULT NULL,
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`c88` varchar(30) DEFAULT NULL,
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`c89` varchar(30) DEFAULT NULL,
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`c90` varchar(30) DEFAULT NULL,
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`c91` varchar(30) DEFAULT NULL,
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`c92` varchar(30) DEFAULT NULL,
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`c93` varchar(30) DEFAULT NULL,
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`c94` varchar(30) DEFAULT NULL,
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`c95` varchar(30) DEFAULT NULL,
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`c96` varchar(30) DEFAULT NULL,
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`c97` varchar(30) DEFAULT NULL,
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`c98` varchar(30) DEFAULT NULL,
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`c99` varchar(30) DEFAULT NULL,
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`c100` varchar(30) DEFAULT NULL,
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`c101` varchar(30) DEFAULT NULL,
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`c102` varchar(30) DEFAULT NULL,
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`c103` varchar(30) DEFAULT NULL,
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`c104` varchar(30) DEFAULT NULL,
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`c105` varchar(30) DEFAULT NULL,
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`c106` varchar(30) DEFAULT NULL,
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`c107` varchar(30) DEFAULT NULL,
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`c108` varchar(30) DEFAULT NULL,
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`c109` varchar(30) DEFAULT NULL,
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`c110` varchar(30) DEFAULT NULL,
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`c111` varchar(30) DEFAULT NULL,
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`c112` varchar(30) DEFAULT NULL,
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`c113` varchar(30) DEFAULT NULL,
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`c114` varchar(30) DEFAULT NULL,
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`c115` varchar(30) DEFAULT NULL,
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`c116` varchar(30) DEFAULT NULL,
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`c117` varchar(30) DEFAULT NULL,
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`c118` varchar(30) DEFAULT NULL,
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`c119` varchar(30) DEFAULT NULL,
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`c120` varchar(30) DEFAULT NULL,
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`c121` varchar(30) DEFAULT NULL,
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`c122` varchar(30) DEFAULT NULL,
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`c123` varchar(30) DEFAULT NULL,
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`c124` varchar(30) DEFAULT NULL,
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`c125` varchar(30) DEFAULT NULL,
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`c126` varchar(30) DEFAULT NULL,
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`c127` varchar(30) DEFAULT NULL,
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`c128` varchar(30) DEFAULT NULL,
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`c129` varchar(30) DEFAULT NULL,
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`c130` varchar(30) DEFAULT NULL,
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`c131` varchar(30) DEFAULT NULL,
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`c132` varchar(30) DEFAULT NULL,
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`c133` varchar(30) DEFAULT NULL,
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`c134` varchar(30) DEFAULT NULL,
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`c135` varchar(30) DEFAULT NULL,
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`c136` varchar(30) DEFAULT NULL,
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`c137` varchar(30) DEFAULT NULL,
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`c138` varchar(30) DEFAULT NULL,
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`c139` varchar(30) DEFAULT NULL,
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`c140` varchar(30) DEFAULT NULL,
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`c141` varchar(30) DEFAULT NULL,
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`c142` varchar(30) DEFAULT NULL,
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`c143` varchar(30) DEFAULT NULL,
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`c144` varchar(30) DEFAULT NULL,
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`c145` varchar(30) DEFAULT NULL,
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`c146` varchar(30) DEFAULT NULL,
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PRIMARY KEY (`c1`)
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) ENGINE=InnoDB;
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LOCK TABLES `t1` WRITE;
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INSERT INTO `t1` VALUES ('1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1','1');
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DROP TABLE `t1`;
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FLUSH LOGS;
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-- echo === Using mysqlbinlog to detect failure. Before the patch mysqlbinlog would find a corrupted event, thence would fail.
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-- let $MYSQLD_DATADIR= `SELECT @@datadir`;
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-- exec $MYSQL_BINLOG $MYSQLD_DATADIR/master-bin.000001 > $MYSQLTEST_VARDIR/tmp/mysqlbinlog_bug42749.binlog
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-- remove_file $MYSQLTEST_VARDIR/tmp/mysqlbinlog_bug42749.binlog
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