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Ensure that a pending semi-sync transaction can only be signalled on its THD while it is waiting in commit_trx(); not if the wait in commit_trx() is skipped for some reason. There was a bug that if no semi-sync slaves were connected and rpl_semi_sync_master_wait_no_slave was off, the THD pointer could be left in the list of pending transactions after THD was deleted, and an invalid THD/condition variable could be signalled, causing hang or other corruption. Testcase based on work by Brandon Nesterenko <brandon.nesterenko@mariadb.com>. Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com> Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
How to run. =========== ./mysql-test-run.pl --suite=rpl --mysqld=--binlog-format=mixed