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If trx_free() and trx_create_low() were called while a call to trx_reference() was pending, we could get a reference to a wrong transaction object. trx_reference(): Return NULL if the trx->id no longer matches. lock_trx_release_locks(): Assign trx->id = 0, so that trx_reference() will not return a reference to this object. trx_cleanup_at_db_startup(): Assign trx->id = 0. assert_trx_is_free(): Assert !trx->n_ref. Assert trx->id == 0, now that it will be cleared as part of a transaction commit.