Having the same problem here. Dovecot 2.1.7. But all I get from doveadm -D is: doveadm(user1 at domain.tld): Debug: expire: Stopping iteration on key shared/expire/anotheruser at domain.tld/Trash (1373817132 > 1373816705) and that's it. The log says: dovecot: dict: Error: dict client: COMMIT: Can't commit while iterating