Applier may crash if replication block contain no savepoint operations

[aafemt]

If a replication block contains no opStartSavepoint tag and transaction savepoint was released because of size (or malicious opReleaseSavepoint tag) the applier will crash accessing NULL tra_save_point.

[dyemanov]

Do you have a stack trace?

[aafemt]

No, it is from code analyze. Problematic line is

		// Undo this particular insert (without involving a savepoint)
		VerbAction* const action = transaction->tra_save_point->getAction(relation);

[pavel-zotov]

Test can not be implemented, letter from dimitr, 23-oct-2021 10:23.