Does the problem go away if you don't configure Dovecot with --enable-devel-checks?
no, its not included in my configure-line. This is it: ./configure \ --prefix=/usr \ --sysconfdir=/etc \ --localstatedir=/var \ --mandir=/usr/share/man \ --with-ssl=openssl \ --with-storages=mbox,maildir,raw \ --with-pam \ --with-passwd \ --with-db \ --enable-debugi just added --enable-debug after having the segfaults whren running the expire-tool to see more lines...
sorry for always making problems ;) Andre