Bug #4953 mysqldump --master-data may report incorrect binlog position if using InnoDB

Description:
This is just a consequence of the "FLUSH TABLES WITH READ LOCK does not block COMMIT" bug, but I'll enter it here as I can fix mysqldump to work around the bug (but can't fix the bug itself yet). Scenario:
* user1
USE test;
CREATE TABLE i (a INT) TYPE=INNODB;
BEGIN;
INSERT INTO i VALUES(1);
* user 2: patch mysqldump so that it sleeps before SHOW MASTER STATUS, then
mysqldump --master-data test i
prints the table as empty, then sleeps; during the sleep:
* user 1
COMMIT;
* user 2
when sleep finishes, it does SHOW MASTER STATUS and so reports the binlog position of the end of the COMMIT. Which is not correct, as the printed data ("empty") is not of this position. Thus breaking later recovery from this backup (if you use the output of mysqldump as a backup).

How to repeat:
see description.

Suggested fix:
Will implement a workaround into mysqldump.

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Additional info:

ChangeSet@1.1968.1.2, 2004-08-20 16:35:23+02:00, guilhem@mysql.com