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MDEV-29368 Assertion `trx->mysql_thd == thd' failed in innobase_kill_query from process_timers/timer_handler and use-after-poison in innobase_kill_query

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This is a 10.5 version of 9b750dcbd8, fix for
MDEV-23536 Race condition between KILL and transaction commit

InnoDB needs to remove trx from thd before destroying it (trx), otherwise
a concurrent KILL might get a pointer from thd to a destroyed trx.

ha_close_connection() should allow engines to clear ha_data in
hton->on close_connection(). To prevent the engine from being unloaded
while hton->close_connection() is running, we remove the lock from
ha_data and unlock the plugin manually.
This commit is contained in:
Sergei Golubchik
2022-09-28 14:27:55 +02:00
parent 74ac683a7e
commit de130323b4
6 changed files with 45 additions and 6 deletions
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sql/sql_class.cc
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@ -1533,6 +1533,8 @@ void THD::cleanup(void)
wsrep_client_thread= false;
#endif /* WITH_WSREP */
DEBUG_SYNC(this, "THD_cleanup_after_set_killed");
mysql_ha_cleanup(this);
locked_tables_list.unlock_locked_tables(this);